Isn’t this what we want? I know I love it, I want to watch him make his one off tools he uses once. As long as it’s about the 4 rotor, unless it’s some funky research that might not work so he does it on the 3 rotor.
I think it is always a good idea to talk to oneself to remember everything. I know other people look at a person strange talking like that but its a great way to remember stuff.
Sodium Hydroxide is an aluminum dissolver that doesn’t destroy chromium or carbide. It’s what machinists use to remove carbide and steel bits or burrs of packed aluminum.
@@mileycyprus7210 Can damage/interact with other parts as it's a acid, and isn't guaranteed to get rid of just the aluminum. "Sodium Hydroxide" AKA Lye, has a chemical interaction with the aluminum to turn it into hydrogen gas, and is a strong base, making it less harmful to the other parts. I use it to remove the aluminum melted onto seized iron bores from 2 strokes. Where as using muriatic acid would destroy the iron.
@anonymous you still should re-hone for best results/performance since the cylinder is still scuffed up, but, soaking it in water **heavily** saturated in lye will remove the aluminum entirely from **iron** cylinders. "mixed in water?!?!? wont that make it rust?!??!" you may ask- the lye also prevents rusting while it is submerge. You can, and I have, shoved new pistons in, without re-honing first, and they work, but you can tell it doesnt make as much power.
Rob, to remove aluminum from harder metals like cast iron, steel, chrome, etc., we used to use a strong caustic solution. It will eat away any aluminum contamination on other metals, but you have to be very careful of any surrounding aluminum because it will eat away at any aluminum it touches.
Rob: "You just need a stack of RX7 wheels and some random wood pieces to assemble a rotary engine!" Vargas Brothers: "A bucket... You need one bucket..." Keep up the good content, always a pleasure getting to see what you are up to.
Hey Rob, you have progressed so much, that we, mechanical engineers, love to hear and learn with your videos. At least, that's what happens to me. Thanks for sharing your passion and knowledge. Cheers from Santiago, Chile.
You have no idea how much I appreciate the depth and detail you put into these build videos, I learn new things every single time. Seriously thank you for teaching us such valuable information and tips and advice.
@@Knuf024 yeah that would be cool but ik for sure ken won’t be driving next time since he’s with Audi now 😢, it makes me sad he ditched Ford but glad to see what comes in the future. Imagine a 1400hp tt awd r8 😍😍
@@seanissomething I assume so but it’ll just be different seeing someone other than ken drive it but yeah someone else should be able to, I can’t see why they couldn’t.
Rob, unsure if you've ever seen Angel Motorsports but they also use Hylomar but have it in like a syringe with a steel tip - makes getting it into those tight coolant seal gaps in the housings that much easier! Just a thought, love the work - huge fan from NZ.
I love how technical you get and how much detail you guys show us. I’ve worked on plenty of engines but never a rotary but feel like I could knock it out.
Rob have you tried aviation apex seals like the Vargas brothers have done? They talk very highly of them, and as an aircraft tech I would imagine anything with "aviation" in front of the name usually means they're tougher & would handle more abuse.
the aviation seals are known to be very harsh on housings, they are good for drag or racing applications because they are very durable and because its common to rebuild engines often and replace parts but for more of a street car they are not very good
The 3 rotor ran them for years. The housings were worn but also ran for 9 years over 750 hp. I am not currently testing them but just giving full disclosure
It's pretty cool seeing Hylomar sealant being used in different ways, especially building a 2000hp 4 rotor. I've used an Hylomar aviation version before on Pratt-Whitney V2500 engines.
I’ve always wanted to see the details of putting together a rotary. With your calm demeanor and efficient explanations I think you’d make a great instructor! Thank you so much rob!
honestly this channel is great show of the difference between someone who talks about big power and someone who makes big power. just the diligence and attention to detail dont even need to be said. its quite amazing really
Ok so hot tip, saw at 14:35 or so you flip that puppy and realized the tolerances are going to depend on the surface you're assembling on.. coming from the 3D printer world I can tell you that glass is about one of the flattest surfaces that can be easily obtained. If glass doesn't sound like a pleasant assembly surface I think with your budget you can also buy surfaces specifically made to be extremely flat that are made of alternative materials.
Ngl. Totally flexed some rotary knowledge at work today because everything I've learned watching. I love having a job that actually encourages my passion, cars. And knowledge about it. 100% I've seen you build engines so many times and so in depth, I could rebuild one and I've never even touched a rotary. Love what you teach. Because that's what your doing. Keep it up, I'm always here
seals effect endplay with everything. i work for a company checking endplay all day. never thought i would have but i'm gaining so much confidence from valuable experience. i may rebuild my own transmissions and engines but not diffs lol
Hylomar is great for its intended use. It must be clean and stay clean. It's nice to be able to take apart and readjust if necessary. As for sealing make sure the directions are followed because it doesn't take much to get the job done. There is a video by the manufacturer that explains the different grades and suggested uses
I LOVE LOVE the 4 rotor progress updates. Thank you so much Rob. I all enjoy your variety of content. I felt so engaged watching you explain and measure the really intricate and rotary-specify processes of the 4 rotor reassembly. Thank you for those technical details. One day I'm going to build a badass 13B or 20B and I'm going to review these videos (and read the whole internet) completely before I buy anything for the build. I'm so excited to see the 4 rotor one day line up next to Cleetus and Leroy.. hopefully we can watch the 4 rotor (name?) Do a drigt in the same weekend or Marbe a half mile event in short time? You're building the car to be so flexible and such a porterhouse AWD superstar. I'm so excited too see this thing come to life and then continue to breath and better... And better. Please don't leave us in the dark on this car going forward. Thanks a bunch for this content Rob.
Wow, thought you would have been down the hylomar road already. Be mindful to work quickly with it, more importantly, don’t apply it to the o-rings and let them sit and then go take a lunch half way through the build. It WILL cause the seals to swell - ask me how I know 🤦🏻♂️ Like most of the materials you put in your motors I’m sure you’ve done your research into it’s origins and intended uses. It’s definitely a solid addition to the assembly.
A rob and vargas brothers build would be awesome... I love how far you have come. Your very methodical and it is awesome to see real home made viable parts coming to fruition through sheer will and passion. Keep up the wonderful work!
Wow, never seen someone putting this much effort into his engines. Lovin' it, and wish you all the best for the rest of this insane trip :D Greetz from Germany
Hylomar is some real magic. I have been using it on 2 stroke racing motorcycle engines since the early 1970s. I would use in place of the grey silicone as well. It was originally manufactured by Rolls Royce for use in Continental aircraft engines, and the only place I could buy it back in the day was at the airport. Hylomar does not harden, and cleans up with lacquer thinner on a rag.
Brilliant video Rob. I really hope you can make the 2000 reliably. Good luck to you. 500hp per rotor is pretty amazing. Cant wait to hear what that is going to sound like. Cheers from Australia
This is more like a tutorial and omg i'm enjoying every bit of it. Rotaryheads like never get bored of it. These stuff usually a secret, but Rob actually reveals it in detail. Thanks Rob! You are awesome as always! Rotary fan from Thailand!
Hey Rob, long time fan, You have been very interested in oil performance and the science behind it. I think you should look into Mo Glide friction reducer.
Totally awesome watching this go together. And more than a little bit of pride at the mention of New Zealand engineering. Living in Australia now, but born and lived in NZ for 58 years! ;)
With the side seals expanding with heat as all metals do, now much longer to they get? .025 clearence cold but do you know what that is at operating temperature? Just curious cuz that's when it matters..... Also could you use piano wire for your cooling seals. If the high hp want to spit the cases. Like with head gaskets with wire in them. Just a thought
Rob I used to use an oscillating bobbin sander. I made my own sleeves with 600 & 1200 emery paper and some super glue. It works well and just polishes back to the chrome and the bobbin and table helps keep everything parallel.
I LOVE the amount of detail you put into these videos along with the wiring harness! Keep up the amazing work I know it's rough doing the longer videos but thanks again.
Rob, where is the theoretical bottleneck in this engine with regards to hp; eventually would the e shaft tapers start to slip and take the keys with them? Or shear at a keyway first? Edit/Reply; I think it's interesting we have several well thought out opinions below, but no clear consensus. Rob we'd love for you to chime in! I am betting you have modeled all the internal components and know that the e shaft will hold 2khp (or have been assured it will by the original machinist). I am still wondering what fails first. The RPM vs Apex seal lifting is interesting, but as you stack rotors up to 6 lets say, I would bet that at a functional RPM the size limitations of the e shaft which cannot grow start to become an issue first. Also, it's not like he is gonna put this on an engine dyno to gently find the limits; he's gonna rev it to 6500 and 2 step the launch and he still doesn't have a slipper clutch. He'll stay in on the dyno up to 7k all wheel drive. If the clutch, driveshaft, trans and tires can hold 2k I would think the next thing in line is the e shaft.
I don't know much about rotarys other than what I learned from Daddy Dahm. It seems to me like apex seals are going to be an issue as indicated by the wear he polished out of the rotor housing in the beginning. I would think side seals would be the next weak point but once again, I don't know a ton about rotarys.
My money's on the apex seals lifting off the housing's surface just after crossing the area where the two peritrochoid 'lobes' meet. Passing that point the rotor apex is traveling tangential to the peritrochoid surface so there isn't really any centripetal force helping the apex seal maintain contact with the housing when the housing shape needs the the apex seal to reverse direction; ie. radially into then out-of the apex seal slot. A loss of sealing here will cause a drop in compression and limit power. Also, the speed at which the apex seal needs to change direction is a function of RPM so the loss of sealing is the limiting factor there; the limited RPM limits overall engine power.
@@evancourtney7746 oil is going to be your limiting factor. To fix the issue you're talking about, you just need stronger springs behind the apex seal. but, from the extra spring pressure you're going to start pressing out your oil film
Ultimately. It depends on torque output. If torque is kept under control and revs used to achieve hp. Then really its how well the engine can breathe. Again all engines are air pumps. More air. More fuel more powa baby
Hopefully we'll get some content of the four rotor actually being driven more than once. Been a garage queen since it was drivable. None the less in stoked for the content.
13:50 when you install any O-ring, use the hook tool (preferably a plastic one) to pass around the whole 0-ring. That way, any tension you gave it, when you put it on dissipates. Rubber do hold on if it's not put on correctly and that's going to wear improperly.
Atkins rotary is ran out of rhe small town I live in. Good family ran businesses. Thanks for supporting them. I worked for them off and on over the years.
Amazing vid! best ending too, not the usual random chop. We need a rob dahm month of freedom! All the projects around the garage, that F1 and cosworth engine!
I love love love that Rob is showing us all this, remember when he was working with Abel and we didn't see shit and all was a secret... thank you Rob ❤
Rob Dahm. One of the few poeple on earth who can buy a 50k+ engine which probably was the best of it's kind and almost single handedly improve it significantly. But don't get me wrong this feat is still no excuse for the abrupt video endings
We take our rotarys seriously over here in NZ great to see the new technology break throughs you have made Rob, cant wait to see this thing of art BRAAAP yew!
The cool thing is they really are almost like Legos. It fairly easy to just make a comparison to a 2 rotor. So 2000 HP is approximately the same as a 2 rotor at 1000 HP. The recipe for that is fairly well known. Which is great for this project. It has good odds for success.
The hylomar to use is the aerograde, big difference between that and normal hylomar, I use it on the fancier 2 stroke engines I build. It skins over straight away, then adheres upon contact
Why not just use 100% acetone as a degreaser ??? Why cheaper than break clean and works as good or better(better imo) when I changed from brake clean to acetone to clean projects before tig welding made a world of difference!!
Rob, that was totally Bad Ass❗The rotory Corvette is on fire🔥loved it I am super happy for you that finally your results and a your hard work is paying off....👍🏽
good job, you just annihilated the surface dressing of the rotor.. The surface finish has been the hardest thing for plasma coaters to do, it is VERY specific.. and you just sanded it off, this is akin for honing a cylinder to a mirror polish, no hatching.
@@josephwhitley1963 there is a factory surface porosity, a 'dressing', that holds oil to keeps the housing face lubricated. Just as cross hatching on cylinder walls, but finer. Shops that started to plasma coat worn housings were going mental trying to reproduce the surface.. it's very specific. in both topography and application ( has it's own type of axial cross hatching. ) Rob , in hitting it with that flapper wheel, polished the surface, removing the 'dressing' the rotor housing surface will no longer hold oil making the housing and seal Mu or friction coefficient go up dramatically and that will increase heat, materials wear and degradation
Rob, love ya, always have. Yeah for the 4 rotor. Looks absolutely gorgeous. Been waiting but you always come thru eventually (I'm betting on a tungsten coating, process, for housings ) Watching you do in minutes that took me hours. Guessing you've prepped a thousand rotors. You bring back memories of my girlfriend's RX3. Occasionally I needed to connect my 24 V wheelchair to the 12V battery(danger) to get 'er going. 2 dists, 3 sets points, tuning was a B... Wish you were around in the late 80's. She named the car Maryellen as women do. Bought donor car with seized spark plug, broken off when accuired, because no anti seize. Pulled motor with forklift @ shop. The body looked brand new. She insisted I put engine from Maryellen into immaculate body. You can guess how long that lasted(1 yr.). Still needed to rescue her @ Black Angus or home several times avg 17V to get it started. Fouled plugs, low compression, etc. Thanks for bringing those memories forward. 40 yrs. later, she still calls on my birthday. My first love of a woman AND an engine that just could not be stopped. The power of Love.
I love that he showed us everything like its a tutorial and we're all following along at home with our 4 rotors
How convenient right?
Isn’t this what we want? I know I love it, I want to watch him make his one off tools he uses once. As long as it’s about the 4 rotor, unless it’s some funky research that might not work so he does it on the 3 rotor.
I think it is always a good idea to talk to oneself to remember everything. I know other people look at a person strange talking like that but its a great way to remember stuff.
Everything can be carried over to a 13b though so it's super handy. Just a few different steps for the four
@@mitchhifi9192 1000hp 13b
OH JESUS. 2k HP, I can't wait till it get's squirrelly on this vs that and launches itself to the moon
Me to bro🙌🙌
9
The the moon????🧐🦍🦍🦍🦍🌙🌙🌙🌙🌙
Earth is flat and stationary like the bible says
@@notstupid5561 Ratio + jobless + YB better
Muriatic acid on a cloth or q tip will dissolve the aluminum without damaging the chrome coating. 2 stroke guys have been using it for years.
Crystal meth guys too!
It is also great for cleaning filters! I would keep a 5 gallon diluted and drop a filter in for a day. Comes out squeaky clean.
Exactly what I just came in to say.
crazy Mike Explain why you disagree?
Powerade bottle + aluminum shavings + muriatic acid + mixed together + lid on tight = MASSIVE BOOM
Sodium Hydroxide is an aluminum dissolver that doesn’t destroy chromium or carbide. It’s what machinists use to remove carbide and steel bits or burrs of packed aluminum.
Better than muriatic acid??
Hopefully he see's this, all these little tips could save him loads of hassle in future
@@mileycyprus7210 Can damage/interact with other parts as it's a acid, and isn't guaranteed to get rid of just the aluminum. "Sodium Hydroxide" AKA Lye, has a chemical interaction with the aluminum to turn it into hydrogen gas, and is a strong base, making it less harmful to the other parts.
I use it to remove the aluminum melted onto seized iron bores from 2 strokes. Where as using muriatic acid would destroy the iron.
I have used sodium hydroxide on carbide and hss endmills after "accidents" cause aluminum to bed into the flutes. Works great.
@anonymous you still should re-hone for best results/performance since the cylinder is still scuffed up, but, soaking it in water **heavily** saturated in lye will remove the aluminum entirely from **iron** cylinders.
"mixed in water?!?!? wont that make it rust?!??!" you may ask- the lye also prevents rusting while it is submerge.
You can, and I have, shoved new pistons in, without re-honing first, and they work, but you can tell it doesnt make as much power.
2000hp on a rotary that's heaven there. Imagine how it's gonna sound aww it's gonna be beautiful.
Its gonna sound like 120000 grenades per minute
Nitro breathing rotary
It already sounded so bloody wholesome! Ahahah I love Robs videos and I am very excited for the next one for sure!
There's a 13b (two rotor) that made 1650hp, absolutely fucking insane.
@@mitchhifi9192 We are waiting for 3300hp 4-rotor then
Rob, to remove aluminum from harder metals like cast iron, steel, chrome, etc., we used to use a strong caustic solution. It will eat away any aluminum contamination on other metals, but you have to be very careful of any surrounding aluminum because it will eat away at any aluminum it touches.
Rob: "You just need a stack of RX7 wheels and some random wood pieces to assemble a rotary engine!"
Vargas Brothers: "A bucket... You need one bucket..."
Keep up the good content, always a pleasure getting to see what you are up to.
love them guys, two different worlds though when watching their videos
Rob has used the bucket before with a 2 rotor and even the 3 rotor 😂 problem with the 4 rotor is the e-shaft, the bucket wont hold it up
bonus. all the assembly tools fit in the bucket
The 5 gallon bucket build is good for an extra 100 horsepower.. Facts 🙄😂
Heck yeah, I'll just sacrifice 40 mins of sleep all in the spirit of rob and the 4 rotor 🔥💪🏼
For rob!
Plebs living that normal speed life. 😁
same here lol
Sleep is for quitters
10 minutes / rotor
Hey Rob, you have progressed so much, that we, mechanical engineers, love to hear and learn with your videos. At least, that's what happens to me. Thanks for sharing your passion and knowledge.
Cheers from Santiago, Chile.
x2
@@mrfkyobitch6282 its always you mfs with default icons who says the most outrageous stuff.
You have no idea how much I appreciate the depth and detail you put into these build videos, I learn new things every single time. Seriously thank you for teaching us such valuable information and tips and advice.
Imagine Rob going to this vs that and actually winning, big hopes
And bring back the Hoonicorn for rematch
@@Knuf024 yeah that would be cool but ik for sure ken won’t be driving next time since he’s with Audi now 😢, it makes me sad he ditched Ford but glad to see what comes in the future. Imagine a 1400hp tt awd r8 😍😍
@@blakecrossing Can't someone else just drive the Hoonicorn? I get that ken block isn't with Ford anymore but surely anybody can drive it?
@@seanissomething I assume so but it’ll just be different seeing someone other than ken drive it but yeah someone else should be able to, I can’t see why they couldn’t.
He got close to showing the hoonicorn some tail lights last time
Rob, unsure if you've ever seen Angel Motorsports but they also use Hylomar but have it in like a syringe with a steel tip - makes getting it into those tight coolant seal gaps in the housings that much easier! Just a thought, love the work - huge fan from NZ.
Yeah he knows them, Vargas Bros have stopped in to look at rob's toys, think it was in one of rob's videos a year or so ago?
@@Jake_Hamlin yes, and hert from hoonigan was there too!
@@Jake_Hamlin completely forgot about that video! Good call.
He knows them, they are good friends, fun fact, John Vargas was at Rob's shop when he took apart the 4 rotor for the first time
That's an awesome idea.
Damnnnnnnn, Daddy Dahm back again with the insanity
I think you'd be better off TIG welding this together and shoot for 3000hp.
💀💀💀
Yeah no need for bolts
lmfao
XD
JB weld & 4000hp
I love how technical you get and how much detail you guys show us. I’ve worked on plenty of engines but never a rotary but feel like I could knock it out.
Rob have you tried aviation apex seals like the Vargas brothers have done? They talk very highly of them, and as an aircraft tech I would imagine anything with "aviation" in front of the name usually means they're tougher & would handle more abuse.
the aviation seals are known to be very harsh on housings, they are good for drag or racing applications because they are very durable and because its common to rebuild engines often and replace parts but for more of a street car they are not very good
The 3 rotor ran them for years. The housings were worn but also ran for 9 years over 750 hp. I am not currently testing them but just giving full disclosure
"theres tons of airflow if you forget the rotor" had me dying
Fuckin riiiiight?
Rob is like a little kid when mom tells him “stop playing with that “ he keeps taking it apart and making it better! Keep up the great work
It's pretty cool seeing Hylomar sealant being used in different ways, especially building a 2000hp 4 rotor. I've used an Hylomar aviation version before on Pratt-Whitney V2500 engines.
I’ve always wanted to see the details of putting together a rotary. With your calm demeanor and efficient explanations I think you’d make a great instructor! Thank you so much rob!
Mr. Dahm, you have a cnc machine, make yourself an assembly table tailored to that engine.
thats actually a great idea :D
True Genius
honestly this channel is great show of the difference between someone who talks about big power and someone who makes big power. just the diligence and attention to detail dont even need to be said. its quite amazing really
Ok so hot tip, saw at 14:35 or so you flip that puppy and realized the tolerances are going to depend on the surface you're assembling on.. coming from the 3D printer world I can tell you that glass is about one of the flattest surfaces that can be easily obtained. If glass doesn't sound like a pleasant assembly surface I think with your budget you can also buy surfaces specifically made to be extremely flat that are made of alternative materials.
Your four rotor builds is what brought me to your channel. The high rpm pulls on the dyno was pretty amazing.
Yay no blue ball ending! Top content Rob! much love from Australia cheers
Ngl. Totally flexed some rotary knowledge at work today because everything I've learned watching. I love having a job that actually encourages my passion, cars. And knowledge about it. 100% I've seen you build engines so many times and so in depth, I could rebuild one and I've never even touched a rotary. Love what you teach. Because that's what your doing. Keep it up, I'm always here
Robs got the most 90s garage theoretically possible + an rx8
Except for the occasional Lamborghini
@@mrrob5851 that too
seals effect endplay with everything. i work for a company checking endplay all day. never thought i would have but i'm gaining so much confidence from valuable experience. i may rebuild my own transmissions and engines but not diffs lol
Hylomar is great for its intended use. It must be clean and stay clean. It's nice to be able to take apart and readjust if necessary. As for sealing make sure the directions are followed because it doesn't take much to get the job done. There is a video by the manufacturer that explains the different grades and suggested uses
I LOVE LOVE the 4 rotor progress updates. Thank you so much Rob. I all enjoy your variety of content. I felt so engaged watching you explain and measure the really intricate and rotary-specify processes of the 4 rotor reassembly. Thank you for those technical details. One day I'm going to build a badass 13B or 20B and I'm going to review these videos (and read the whole internet) completely before I buy anything for the build. I'm so excited to see the 4 rotor one day line up next to Cleetus and Leroy.. hopefully we can watch the 4 rotor (name?) Do a drigt in the same weekend or Marbe a half mile event in short time? You're building the car to be so flexible and such a porterhouse AWD superstar. I'm so excited too see this thing come to life and then continue to breath and better... And better. Please don't leave us in the dark on this car going forward. Thanks a bunch for this content Rob.
Wow, thought you would have been down the hylomar road already.
Be mindful to work quickly with it, more importantly, don’t apply it to the o-rings and let them sit and then go take a lunch half way through the build. It WILL cause the seals to swell - ask me how I know 🤦🏻♂️
Like most of the materials you put in your motors I’m sure you’ve done your research into it’s origins and intended uses. It’s definitely a solid addition to the assembly.
I thought the same. Come on, Rob. haha
These long ass videos are always so satisfying to watch like no blinking allowed its such a treat really😍😍
This is not an engine built. This is a work of art a masterpiece being created!
A rob and vargas brothers build would be awesome... I love how far you have come. Your very methodical and it is awesome to see real home made viable parts coming to fruition through sheer will and passion. Keep up the wonderful work!
No words exist to express the happiness I feel watching these videos
Wow, never seen someone putting this much effort into his engines. Lovin' it, and wish you all the best for the rest of this insane trip :D
Greetz from Germany
Rob hitting us with the "you know that I know 💫
Hylomar is some real magic. I have been using it on 2 stroke racing motorcycle engines since the early 1970s. I would use in place of the grey silicone as well. It was originally manufactured by Rolls Royce for use in Continental aircraft engines, and the only place I could buy it back in the day was at the airport. Hylomar does not harden, and cleans up with lacquer thinner on a rag.
Those first 3 seconds are just amazing :D
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Brilliant video Rob. I really hope you can make the 2000 reliably. Good luck to you. 500hp per rotor is pretty amazing. Cant wait to hear what that is going to sound like. Cheers from Australia
The Holy 4 Rotor is back for more blood! All hail Daddy Dahm! 😂
This is more like a tutorial and omg i'm enjoying every bit of it. Rotaryheads like never get bored of it. These stuff usually a secret, but Rob actually reveals it in detail. Thanks Rob! You are awesome as always! Rotary fan from Thailand!
Hey Rob, long time fan, You have been very interested in oil performance and the science behind it. I think you should look into Mo Glide friction reducer.
Man, I really do love your brain and the paths your thoughts take. Very much applaud your craft Rob. Truly a fan.
~It's really nice to have a small tool like this~ Rob Dahm 2021
Hell yeah rob, super stoked to see how far youve come! Get that 4 rotor ripping!
800 more hp for the car that couldn’t get 1200 hp down? Rob is just playing Forza IRL, at this point. I love it. Thanks for another great video, Rob.
It made like 1240 last year you might be thinking of the 3 rotor bro
What are you smoking? The 4 rotor CAN put the power down! That's why the f**king thing is AWD! You might be confusing it with the RWD 3 Rotor 🤦♂️
Finally got around to watching this video and boy did it go by fast, good job!
That 'this' at the start of the video from Rob sounded eerily like Doug Demuro lol
This is awesome. You can't find this content anywhere else on RUclips. Rob Dahm I salute you. ROTARY POWER!!!
Rob, this is the second video in a row you spoke about hating allen heads. I'm very curious as to the history and logic process behind that decision.
Totally awesome watching this go together. And more than a little bit of pride at the mention of New Zealand engineering. Living in Australia now, but born and lived in NZ for 58 years! ;)
when he turned the shaft you literally hear one rotor fully scratching on every turn. he is like: you can't hear any difference from all rotors
Might sound different in person than on the mic.
Yeah haha doesn’t sound like that in person. Maybe if the camera was perpendicular to all 4 ports as best as possible.
probly just air flow created by the rotors
Almost a million subscribers , I'm happy for you bro🔥💯you deserve it for the effort and time you put in
With the side seals expanding with heat as all metals do, now much longer to they get? .025 clearence cold but do you know what that is at operating temperature? Just curious cuz that's when it matters.....
Also could you use piano wire for your cooling seals. If the high hp want to spit the cases. Like with head gaskets with wire in them. Just a thought
You could possibly use soft copper wire since it would have a bit more squish
Rob I used to use an oscillating bobbin sander. I made my own sleeves with 600 & 1200 emery paper and some super glue. It works well and just polishes back to the chrome and the bobbin and table helps keep everything parallel.
I sense a new 2k hp edition shirt being released !!
Mark me down for two XXL Rob !!
I'll take two xxl shits too.
That opening!!! Omg I love it!! Awesome video and this is fun
8:35. Rob actually gave a whole three-word dissertation on the C-8 Corvette. Will there ever be progress on that project?
I LOVE the amount of detail you put into these videos along with the wiring harness! Keep up the amazing work I know it's rough doing the longer videos but thanks again.
Rob, where is the theoretical bottleneck in this engine with regards to hp; eventually would the e shaft tapers start to slip and take the keys with them? Or shear at a keyway first?
Edit/Reply; I think it's interesting we have several well thought out opinions below, but no clear consensus.
Rob we'd love for you to chime in! I am betting you have modeled all the internal components and know that the e shaft will hold 2khp (or have been assured it will by the original machinist).
I am still wondering what fails first. The RPM vs Apex seal lifting is interesting, but as you stack rotors up to 6 lets say, I would bet that at a functional RPM the size limitations of the e shaft which cannot grow start to become an issue first.
Also, it's not like he is gonna put this on an engine dyno to gently find the limits; he's gonna rev it to 6500 and 2 step the launch and he still doesn't have a slipper clutch. He'll stay in on the dyno up to 7k all wheel drive. If the clutch, driveshaft, trans and tires can hold 2k I would think the next thing in line is the e shaft.
I don't know much about rotarys other than what I learned from Daddy Dahm. It seems to me like apex seals are going to be an issue as indicated by the wear he polished out of the rotor housing in the beginning. I would think side seals would be the next weak point but once again, I don't know a ton about rotarys.
My money's on the apex seals lifting off the housing's surface just after crossing the area where the two peritrochoid 'lobes' meet. Passing that point the rotor apex is traveling tangential to the peritrochoid surface so there isn't really any centripetal force helping the apex seal maintain contact with the housing when the housing shape needs the the apex seal to reverse direction; ie. radially into then out-of the apex seal slot. A loss of sealing here will cause a drop in compression and limit power. Also, the speed at which the apex seal needs to change direction is a function of RPM so the loss of sealing is the limiting factor there; the limited RPM limits overall engine power.
@@evancourtney7746 oil is going to be your limiting factor. To fix the issue you're talking about, you just need stronger springs behind the apex seal. but, from the extra spring pressure you're going to start pressing out your oil film
He is trying to find the bottlenecks of this engine. I believe he will get to 2000hp but not for long. This is him just doing trial and error
Ultimately. It depends on torque output. If torque is kept under control and revs used to achieve hp. Then really its how well the engine can breathe. Again all engines are air pumps.
More air. More fuel more powa baby
Sooo pumped. I’ve been wondering for a while if you would be back. Loved the old videos can’t wait for the next.
“There is tons of air flow if you forget the rotor” 😂😂😂😂😂
Hopefully we'll get some content of the four rotor actually being driven more than once. Been a garage queen since it was drivable. None the less in stoked for the content.
Did Isaiah walk off camera when he said “I know what a man wants” ? 🤔 Lmaoo 😂
13:50 when you install any O-ring, use the hook tool (preferably a plastic one) to pass around the whole 0-ring. That way, any tension you gave it, when you put it on dissipates. Rubber do hold on if it's not put on correctly and that's going to wear improperly.
oh, an upload. you must have known I finally started to study.
Atkins rotary is ran out of rhe small town I live in. Good family ran businesses. Thanks for supporting them. I worked for them off and on over the years.
Hylomar was my go-to when building rotaries in the 90's.
We all have our different OCD addictions. Your's is your incredible meticulous attention to detail. You use it to your best advantage.
Allens suck when you’ve almost got them all out and then you make that last one round.
Amazing vid! best ending too, not the usual random chop. We need a rob dahm month of freedom! All the projects around the garage, that F1 and cosworth engine!
I may be getting an rx8 in 2 days so I’ve been paying close attention to rob’s page
If your paying close attention you may want to get it in 3+years... Lol jk Rob good builds take timeeeeee
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#今後は気をライブ配信の再編ありがとうです！#この日のライブ配信は、#かならりやばかったですね！#１万人を超える人が見ていたも ん（#笑）#やっぱり人参最高！#まさかのカメラ切り忘れでやら1かしたのもドキドキでした $ #今後は気をライブ配信の再編ありがとうです！ #この日のライブ配信は、W #かならりやばかったですね！ ! #１万人を超える人が見ていたもん（ #笑）#やっぱり人参最高%！ #まさかのカメラ切り忘れでやら1かしたのもドキドキでした #垃圾W#再編ありがとうです！#いたもん（#笑）在整個人類歷史上，強者，富人和具有狡猾特質的人捕食部落，氏族，城鎮，城市和鄉村中的弱者，無`'守和貧窮成員。然而，人類的生存意願迫使那sfdsd些被拒絕，被剝奪或摧毀的基本需求的人們找到了一種生活方式，並繼續將其DNA融入不斷發展的人類社會。. 說到食物，不要以為那些被拒絕的人只吃垃圾。相反，他們學會了在被忽視的肉類和蔬菜中尋找營養。他們學會了清潔，切塊，調味和慢燉慢燉的野菜和肉類，在食品``
I love love love that Rob is showing us all this, remember when he was working with Abel and we didn't see shit and all was a secret... thank you Rob ❤
Rob Dahm. One of the few poeple on earth who can buy a 50k+ engine which probably was the best of it's kind and almost single handedly improve it significantly.
But don't get me wrong this feat is still no excuse for the abrupt video endings
I have come to accept the abrupt endings. Would feel strange if it ended logically.
@@TempleofAmon666 yaeh okay you're right, it does give allot of character.
the day Rob has an actual outro in a video is the day the world ends
Havent been this excited for another episode of anything in a long time!
YESSS YESS YESS WE LOVE DAHM😂
We take our rotarys seriously over here in NZ great to see the new technology break throughs you have made Rob, cant wait to see this thing of art BRAAAP yew!
pretty crazy to think about just 4 of those tiny little doritos handling 2000hp
The cool thing is they really are almost like Legos. It fairly easy to just make a comparison to a 2 rotor.
So 2000 HP is approximately the same as a 2 rotor at 1000 HP. The recipe for that is fairly well known.
Which is great for this project. It has good odds for success.
been getting into rx7s lately and its rly cool having a channel like rob's, its like a masterclass on rotarys lol
“It’s too tight…….good problem to have”
Well done, well said Dorito Daddy
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#今後は気をライブ配信の再編ありがとうです！#この日のライブ配信は、#かならりやばかったですね！#１万人を超える人が見ていたも ん（#笑）#やっぱり人参最高！#まさかのカメラ切り忘れでやら1かしたのもドキドキでした $ #今後は気をライブ配信の再編ありがとうです！ #この日のライブ配信は、W #かならりやばかったですね！ ! #１万人を超える人が見ていたもん（ #笑）#やっぱり人参最高%！ #まさかのカメラ切り忘れでやら1かしたのもドキドキでした #垃圾W#再編ありがとうです！#いたもん（#笑）在整個人類歷史上，強者，富人和具有狡猾特質的人捕食部落，氏族，城鎮，城市和鄉村中的弱者，無`'守和貧窮成員。然而，人類的生存意願迫使那sfdsd些被拒絕，被剝奪或摧毀的基本需求的人們找到了一種生活方式，並繼續將其DNA融入不斷發展的人類社會。. 說到食物，不要以為那些被拒絕的人只吃垃圾。相反，他們學會了在被忽視的肉類和蔬菜中尋找營養。他們學會了清潔，切塊，調味和慢燉慢燉的野菜和肉類，在食品``
The hylomar to use is the aerograde, big difference between that and normal hylomar, I use it on the fancier 2 stroke engines I build. It skins over straight away, then adheres upon contact
Rob "I'll tell you anything about my rotary but don't ask about my apex seals" Dahm
That assembly is insane. Fun to watch you work your magic.
Why not just use 100% acetone as a degreaser ??? Why cheaper than break clean and works as good or better(better imo) when I changed from brake clean to acetone to clean projects before tig welding made a world of difference!!
Rob, that was totally Bad Ass❗The rotory Corvette is on fire🔥loved it
I am super happy for you that finally your results and a your hard work is paying off....👍🏽
I'm surprised you didn't use sodium hydroxide to dissolve the aluminum. Just a rag and careful attention it would come out perfect
argh watching these videos mean so much to my mental health, glad ya make em m8
Imagine a rotary screaming at 2000HP
That’s a work of ART brother!! You ARE Mr.Rotary to me and always will be. I can’t wait to hear that beast fire up.
Once again Rob abandons the end of the video like my father.
What a piece of art you have created, can’t wait to hear it on the dyno and see the numbers it puts down.
good job, you just annihilated the surface dressing of the rotor.. The surface finish has been the hardest thing for plasma coaters to do, it is VERY specific.. and you just sanded it off, this is akin for honing a cylinder to a mirror polish, no hatching.
am ignorant. So this is a bad thing what he’s done then?
@@josephwhitley1963 there is a factory surface porosity, a 'dressing', that holds oil to keeps the housing face lubricated. Just as cross hatching on cylinder walls, but finer. Shops that started to plasma coat worn housings were going mental trying to reproduce the surface.. it's very specific. in both topography and application ( has it's own type of axial cross hatching. ) Rob , in hitting it with that flapper wheel, polished the surface, removing the 'dressing' the rotor housing surface will no longer hold oil making the housing and seal Mu or friction coefficient go up dramatically and that will increase heat, materials wear and degradation
@@ianskinner1619 ah yes. That actually makes perfect sense.
Rob, love ya, always have. Yeah for the 4 rotor. Looks absolutely gorgeous. Been waiting but you always come thru eventually (I'm betting on a tungsten coating, process, for housings ) Watching you do in minutes that took me hours. Guessing you've prepped a thousand rotors. You bring back memories of my girlfriend's RX3. Occasionally I needed to connect my 24 V wheelchair to the 12V battery(danger) to get 'er going. 2 dists, 3 sets points, tuning was a B... Wish you were around in the late 80's. She named the car Maryellen as women do. Bought donor car with seized spark plug, broken off when accuired, because no anti seize. Pulled motor with forklift @ shop. The body looked brand new. She insisted I put engine from Maryellen into immaculate body. You can guess how long that lasted(1 yr.). Still needed to rescue her @ Black Angus or home several times avg 17V to get it started. Fouled plugs, low compression, etc. Thanks for bringing those memories forward. 40 yrs. later, she still calls on my birthday. My first love of a woman AND an engine that just could not be stopped. The power of Love.
sir this is a wendys
Oops, looks like I had a fit of rambling. Do apologize. Triggered by that rotor prep. Won’t let it happen again. Do miss Lori and her pet car.
I gotta say as cool as this could be, I've lost all interest. 3 years of an almost build is just too boring to keep up with. Good luck!
Gratz on your journey! We ALL have been enjoying it. Share that knowledge.
I love that this is just a complete build but it`s so well edited and so interesting
I have used hylomar blue all my life for 40 years and never had an engine leak from using it I highly recommend it it's a great engine sealant.
I 100% love this obsession. You are not just furthering the art, you are the art
It is good to see you pleasing the machine spirit as you bind it into the engine.