if you look closely at the pinion shaft there is a crush sleeve on it that will need to be replaced. it's one of the adjustment points for the pinion you really need to replace every time you rebuild the diff. it's the little black thing in the middle of the pinion shaft it go's between the outer bearing and the shaft itself
@Max Power He wants to make sure it's as best as he can get it, he is preparing it for a race 😂 and a rotary you don't give full power constantly or you'll fuck up the entire engine. Rotary's are very delicate engines, one little thing breaks and it can trash the entire engine. Yes he has spent a lot of time on this car but so what? The reward of it being "complete" (no project car is ever complete) will just be more gratifying
Rob, if you're considering using the other gearing for top speed runs, it'll save you time to buy another diff (yes, I know it's all just $). That way when you need to change ratios, you just pull out the other diff, swap over your special cover, then reinstall, and save a lot of time and material (bearings) to swap it over.
@@traxxasslash95 especially considering winter's can make him a proper reverse rotation front diff, running a standard rotation gear in the front isn't going to last long with power being put through it.
@@bradwolf9410 the differential doesn't care what direction it is rotating. the only thing that matters in that regard is lubrication, and i am more than positive that the diff will be able to lubricate itself just fine in reverse rotation
@@bradwolf9410 and dynatrac manufactures ring and pinions with the teeth in reverse orientation just like Rob's teeth will be and they say it is stronger
@Max Power he is one dude that had to learn how to make his car. Not a fucking mulit million dollar company or a fucking government agency (at the time)
@Max Power Firstly, you do realize Rob has a separate business right? Not like he can devote every bit of his time to this car, its not his full time job. The Wright brothers spent *years* trying to develop a well working glider, any craftsman can go build himself some wings, jump off a building, and claim he flew. Regarding the whole space thing, that can arguably be done in under a week, and does not equate to this car in any way. Silly arguments are easy to shoot down my friend... Secondly, the primary people working on this car were Rob, Isaiah, and his other new guys. If you simply can't understand the amount of work that has to go into building a car like this, it's pointless for you to watch these videos. Realize how much bespoke stuff has been made for this car. Realize that Rob is not building it for one simple purpose like a land speed record. It is meant for many things. And guess what, the more videos he makes, the more he is able to fund this car!! Its business, get over it!
Please remember to replace the crush sleeve in between the two bearings on the pinion, that is where your lash/ preload adjustment is. I didnt see any shims pulled out after the pinion flange was removed.
No need to constantly take the diff apart. BMW has specifications on how and where to set it. You have a crush washer on the pinion shaft that sets the pinion depth.
Dude looks like he's high on cocaine in some videos, but sleep deprivation gives you that glassy and red-eyed look, too, and I know this dude ain't about to risk his whole project by gettin yaked lol but damn he looks high as shit when he's done an allnighter or two lol
8:58 Ford for sure and I think GM use a crush washer. You install the pinion first and depending if you replaced all the bearings pr not will decide on how many inch lbs of resistance you apply to the pinion nut which positions the pinion correctly. Or you can buy aftermarket shims and have to assemble and gut everything repeatedly until the gears contact each other within spec. It's easier to only have to juggle ships between the two sides of the differential than both sides plus the pinion.
Rob M watching you from the time of 3 rotor mazda. I has seen the complete process of 4 rotor billet Awd monster and now very excited to see the End result ! Stay Blessed and Keep Rocking..
Had the same experience with old nasty gear oil in the hair. Smell still makes me gag 50 years later. Thank goodness Corvair Corsa trans-axels are tough and don't break often. Love the project. Thanx Rob
Rob when I first subscribed to you a few years ago I thought " yeah the contents good and I enjoy watching but god this guys a rank amateur hobbyist " I've been a qualified mechanic 22 years and now I'm watching so that you can teach me a few things I didnt know. I have to applaud you on the rate that you have learned and grown. Well done my man. Pretty inspiring stuff mate 👍
That means alot man. Obviously i have so much more to learn but im giving it my all. juggling so many different aspects of a custom build gets a little scattered at times. but i love fabricating
@@RobDahm hey doesnt matter what your experience is.... "everyday a school day " as I always say. Keep it up mate. Some of the best content on youtube lately 🤘
ROB, when or if you break either diff, due to the massive power you are making, have both sets of gears, set to "REM" Polishing, & then sent to "300 BELOW" for cryogenic treatment. The polishing will add some strength, but better yet, put more power to the ground, and the Cryo, will make the gears as strong as a street gear can be! By the way, i like how your real, and doing this stuff! KICKAZZ CAR YOU HAVE BUILT! Oh these recommendations work on trans gears, shafts, internal differential gears, shafts, or any steel parts you want to be as strong as possible. Look into 300 BELOW and their Motorsports background! CHEAP INVESTMENT, AND IT WORKS!
Couple pointers that could help; if you TIG the bearing races (just to heat them a lot, but not meld them) and let them cool again they'll be a lot easier to remove. The race expands through the heat but can't because of the casing. So it actually shrinks when heated and when cooling down it'll be slightly smaller. The diff carrier by the way seems to a torsen type, used mostly in Z3s but not in M cars, they have normal clutch LSD carriers. The torsen doesn't have any preload. Another thing, don't forget the crush ring between the pinion bearings :D you also need to reshim the the diff when you replace any part, like the ring or a bearing
As a millwright; put one punch mark on side a and 2 on side b and respectively on the case and also after you pulled the input shaft seal, put a straight edge across the end of the diff input shaft and use the depth stick of a set of verniers to get a measurement for backset. it'll get you close.
The pinion looks like it has a collapsible spacer on the shaft, which will mean there is a rotational torque setting for pinion bearing preload. Very important to bearing longevity.
Gear oil hair care, it's smooth, silky, vibrant, luxurious, this is the real reason you still have all your hair is all the friction modifier on your scalp (generally the friction modifier additive is what gives gear oil that smell).
0:16 Apply a light layer of GL-4 gear oil to your pan, Valvoline is best but other brands work as well. Add your differential ring gear and let it brown on both sides for 4 minutes at 10,000 rpm. Next add the pinion and bearings, cover and let simmer. After 10 minutes remove, from the pan and plate the dish. Garnish with differential shims
2:30 I had the same thing happen with my Miata, except is was facing the other direction. I was completely soaked in transfluid from the waist down...and I was wearing jeans
It might be too late to tell you now. If you're able to not destroy the old bearings, take a carbide bit to the inside bore of the bearings and you can use them as "set up" bearings. Very useful to have when setting up a diff.
If you turn the whole diff case over 180 degrees you you reverse the output drive direction and keep the drive thrust between the two main gears exactly as they were designed to work! Exactly the same as many race cars that used the VW gearboxes did for years before there were custom gearboxes available.
Rob buddy, I believe the moment that best describes "prolapsing" is when you finally got the pinion shaft loose and the bearing popped straight out of the housing off its races...
The forces on the diff gear will be the same either in forwards or revere if ran , however the diff casing strength will be the weak point as will be webbed and reinforced for running in opposite direction
Yo Rob! I've never set backlash on a diff before but I think if you just read the factory manual, they have a much easier way to do the adjustment,,, I believe it involves using a dial indicator! And or maybe some white grease or paint on the teeth
That nice Haas machine of yours would do a good job of machining new rings and possibly pinions for that diff so you could run it the other way around. No longer in reverse.... send it off for induction hardening or something similar and you have unlimited gearing options
If you actually are running the diff backwards you need to do a bit of a re-design. Helical gears will not run properly backwards. What you need to do is put another drain plug in the top of your front cover. That way you can run the diff upside down. When a diff is upside down it will run backwards but with the input shaft turning the same direction. I'm assuming it is upside down though because your front and rear propshafts are running in the same direction. So if that is the case you don't need to worry about it.
5:59 I don't remember. what was the reason Rob didn't track down a front truck IFS diff? also you could just flip the diff over and it would spin the right way. But only if the housing is shaped to coat the ring and pinion correctly and you have a way to fill the housing with a lubricant to the proper level.
That is not correct. The only thing that would change would be that the wheels would turn the other way. If you use a diff designed for the rear as a front diff, it will inherently run in reverse.
I guess it could go either way. But I was going to shim the race on the pinion and save the crush sleeve for the preload without changing that depth. Honestly this is only my second rodeo 😂
Shims should be between pinion gear and inner bearing. Reusing existing shims will probably get you very close to the right setup. The shimming is usually case specific, not ring and pinion specific. IE the cases and carrier have more machining error than the gears
Pinion should have a + or - number to indicate the pinion variation from “0”. +5 means the pinion is 5 thou bigger, and you need to compensate by taking 5 thou out of the shim thickness. -5 means the pinion needs 5 thou added to shim thickness. If original pinion was +5 and new is -5, the pinion variation cancels and you need no shims.
Could you flip the diff and then use the drive side of the ring gear for strength? The ring will still rotate properly so the oil should still circulate to the pinion maybe with more resistance.. If its got a vent plug it and make another on the new top side / previously bottom
Rob! be aware that those BMW diff´s don´t like to be driven in the opposite direction! And cooling specially is a problem with these! even if you don´t change the direction, orientation and the back-(in your case front) cover! If you ever conceive of driving this thing for longer durations on high speeds, be aware that this thing will overheat and murder itself!
Hey Mr. Custom, why not order a custom ring and pinion with the teeth going in the opposite direction to fix the whole diff spinning in reverse shenanigans?
Probably too big for the chassis as it currently sits, but Currie has a 9" IFS center section available. If that were fitted to the four rotor in the future, the gearing choices would be nearly infinite.
@Max Power I don't doubt it will run, but it probably shouldn't unless he gets some shielding around his legs/Trans tunnel, and a good bit of testing days before to make sure the chassis feels right accelerating to incrementally higher speeds. And actually go around with a torque wrench and check everything over thoroughly...
Fitting a new ring and pinion gear set is one of those jobs that I hate doing. Literally have to take it apart and put it back together many times to get that nice acceptable contact pattern while maintaining correct preload. 😐.
At least you get to shim IRS diffs on a bench. My Mustang diff had me under the car hucking the torsen in and out like a very delicate kettlebell. Really tiring and tedious when your car is not on a lift.
Isn't the pinion the constant and you shim the ring left and right to set the proper backlash? That pinion does not have a crush collar so the preload on that is the constant.
Pink Sock first 5 seconds stack tolerance roughly 250 seconds in :) Doesn't the pinion have a crush sleeve on there? Isn't that what's in the middle of the 2 bearings on the shaft?
The very last thing Rob said was "Why the he'll does this gear oil smell like shit?" Lol,,, I think it's from high sulfur content which is similar to rotten eggs. It's also so you don't confuse it with motor oil because you can tell by the odor. Natural gas has Sunkist odorant added called "mercaptan" for safety reasons otherwise it's odorless and you could blow yourself up if striking a switch or match
I've always just left the bearings if there's no score marks on the races. what's it sound like you have... so you have to replace them but I've always gotten lucky just swap the gears out and it's been really close and said screw it and never had a problem.
Given the fact that the rotation is now going to be reversed, are the pinion bearings going to be lubed correctly? There is an oil galley that the ring(in regular rotation) serves as a water-wheel and directs oil into the galley and constantly lubes the pinion bearings.
7:43 A Ford 8.8 just comes out. Was very easy when I rebuilt my rear in my Foxbody Mustang. But I guess German engineering just had to make it a pressed fit like that.
Peg your diff. In the land rover world we don't have the best diffs/axles😂 so we peg the diff by have a phospha-bronze Pas running on the back of the crown wheel held in place by some studs through the diff case. This stops the crown teeth walking up the pinion screw and stripping teeth. Best strength mod you can make
Do you have plans on designing and building your own front diff that doesn’t have to run in reverse? I know there are Ford 8.8 and 9” center section solutions but are larger than the BMW. Toyota FJ80 Land Cruiser 3rd member in a custom center section might work.
2:42 Gear oil in the hair stinking for 3 days after washing it 18 times .... Yup , been there and the wife will never let me live it down. That was 20yrs ago, I guess that's love.
You gotta cnc mill rob make a new one bro lol but you should really by a machinist handbook edition 30 or so by now but there is a lot of useful info u could use. Even like minor diameters on tapped holes to make sure it’s has enough thread engagement
maybe you should call out to some other german guys for your differential the youtuber phillip kaess is bulding the same BMW differential with an inverted rotation for his audi rs4
Grindr has dilfs not diffs. Knowing the difference could save your project.
Could literally save his ass
@@Arcinsaw Or completely destroy it.
@@Arcinsaw 🤣🤣🤣
you think rob bottoms? seems like a bottom to me...
@@mickgrimes9078 whatever he does he does it with power.
Stories with Rob are almost as fun and interesting as watching him build the 4 rotor !
Wait till he builds a n 9 rotor failure
"I bought this diff off of whatever, Ebay, Craigslist, Grindr."
Hold on now wait a minute Rob 👀
Maybe sell parts on there for the slow days ?
@@MrTheHillfolk oh boy hahaha
@@MrTheHillfolk
Ayyyyye lol
😆😆
He did say something about prolapse when he was pressing the shaft out of the hole"
if you look closely at the pinion shaft there is a crush sleeve on it that will need to be replaced. it's one of the adjustment points for the pinion you really need to replace every time you rebuild the diff. it's the little black thing in the middle of the pinion shaft it go's between the outer bearing and the shaft itself
I'm so excited seeing what this amazing car is becoming!!
You'll be waiting till Baron Trump president
@Max Power He wants to make sure it's as best as he can get it, he is preparing it for a race 😂 and a rotary you don't give full power constantly or you'll fuck up the entire engine. Rotary's are very delicate engines, one little thing breaks and it can trash the entire engine. Yes he has spent a lot of time on this car but so what? The reward of it being "complete" (no project car is ever complete) will just be more gratifying
“Prolapsing”.. I better see a NordVPN commercial in here because I know rob has some dirt in his browser history 😂
Shit the guy down on the press was surely a man of culture😂
Rob, prolapsing happens in the rear end not the front end. Everyone knows that...
actually a messed up pelvic floor can push organs out either hole... sorry for that.
Vaginas can prolapse
Yuck
Well, getting worked that hard in comments does end in a prolapse
Johnny use the words bitter and end in a sentence.
Johnny: my dog chased my cat and bitter end.
I love how these videos are straight to the point. No BS.
Rob Dahm. More like Rob Damn.
Much love, your friends at Rev Media!!
Rob, if you're considering using the other gearing for top speed runs, it'll save you time to buy another diff (yes, I know it's all just $). That way when you need to change ratios, you just pull out the other diff, swap over your special cover, then reinstall, and save a lot of time and material (bearings) to swap it over.
Or he should just invest in a pair of quick change diffs.
@@traxxasslash95 especially considering winter's can make him a proper reverse rotation front diff, running a standard rotation gear in the front isn't going to last long with power being put through it.
@@bradwolf9410 the differential doesn't care what direction it is rotating. the only thing that matters in that regard is lubrication, and i am more than positive that the diff will be able to lubricate itself just fine in reverse rotation
@@FUCK_________googIe the ring is cut to spin in a certain direction
@@bradwolf9410 and dynatrac manufactures ring and pinions with the teeth in reverse orientation just like Rob's teeth will be and they say it is stronger
I used to be excited to see the car make a pass or something, but I’m just in it for the journey at this point
@Max Power Just let him perfect it how he wants to. I would do the same if I had the ability
@Max Power he is one dude that had to learn how to make his car. Not a fucking mulit million dollar company or a fucking government agency (at the time)
@Max Power Firstly, you do realize Rob has a separate business right? Not like he can devote every bit of his time to this car, its not his full time job. The Wright brothers spent *years* trying to develop a well working glider, any craftsman can go build himself some wings, jump off a building, and claim he flew. Regarding the whole space thing, that can arguably be done in under a week, and does not equate to this car in any way. Silly arguments are easy to shoot down my friend...
Secondly, the primary people working on this car were Rob, Isaiah, and his other new guys. If you simply can't understand the amount of work that has to go into building a car like this, it's pointless for you to watch these videos. Realize how much bespoke stuff has been made for this car. Realize that Rob is not building it for one simple purpose like a land speed record. It is meant for many things. And guess what, the more videos he makes, the more he is able to fund this car!! Its business, get over it!
The how can Rob Fail more. Let's count the failures. R/Rob_fails.
Oct 14 it goes for a full power run. Im absolutely terrified lol. Im used to it on jackstands or on the dyno hahaha
Please remember to replace the crush sleeve in between the two bearings on the pinion, that is where your lash/ preload adjustment is. I didnt see any shims pulled out after the pinion flange was removed.
No need to constantly take the diff apart. BMW has specifications on how and where to set it. You have a crush washer on the pinion shaft that sets the pinion depth.
Crush washer applied correct bearing preload, I didn't think it set the pinion height
@@mcspikesky you might be right. Also that avatar brings back memories
Pinion depth it set with a shim under the bearing closest to the pinion gear. Crush washer is used for bearing preload.
This guy always looks like he just rolled out of bed but is still tired.
Dude looks like he's high on cocaine in some videos, but sleep deprivation gives you that glassy and red-eyed look, too, and I know this dude ain't about to risk his whole project by gettin yaked lol but damn he looks high as shit when he's done an allnighter or two lol
Just looks like a guy amped up about a project to where sleep and hygiene have become more of a nuisance than anything, been there.
Anyone else really enjoy the quick cuts of unbolting. Your editing is getting much better Rob.
And that's why ruby got some mcfarland fab on that new high flow exhaust
8:58 Ford for sure and I think GM use a crush washer. You install the pinion first and depending if you replaced all the bearings pr not will decide on how many inch lbs of resistance you apply to the pinion nut which positions the pinion correctly. Or you can buy aftermarket shims and have to assemble and gut everything repeatedly until the gears contact each other within spec. It's easier to only have to juggle ships between the two sides of the differential than both sides plus the pinion.
Rob M watching you from the time of 3 rotor mazda. I has seen the complete process of 4 rotor billet Awd monster and now very excited to see the End result !
Stay Blessed and Keep Rocking..
Had the same experience with old nasty gear oil in the hair. Smell still makes me gag 50 years later. Thank goodness Corvair Corsa trans-axels are tough and don't break often.
Love the project.
Thanx Rob
Last time I was this early the doubters were still in the comments.
pepega
We are still here to put Rob down in the dirt
@@misterwafflezzz Is that a Ludwig reference?
@@misterwafflezzz forsenSmug doubters?
Rob when I first subscribed to you a few years ago I thought " yeah the contents good and I enjoy watching but god this guys a rank amateur hobbyist "
I've been a qualified mechanic 22 years and now I'm watching so that you can teach me a few things I didnt know.
I have to applaud you on the rate that you have learned and grown. Well done my man. Pretty inspiring stuff mate 👍
That means alot man. Obviously i have so much more to learn but im giving it my all. juggling so many different aspects of a custom build gets a little scattered at times. but i love fabricating
@@RobDahm hey doesnt matter what your experience is.... "everyday a school day " as I always say. Keep it up mate. Some of the best content on youtube lately 🤘
I didn't realize Grinder was a good place to find car parts. I figured on lubricants, but not parts.
It's a great place to look for used tools.
All kinds of rods on there
Heard it's a great place to find nuts of all kinds.
O yeh you can find all kinds of shafts......... apparently
ROB, when or if you break either diff, due to the massive power you are making, have both sets of gears, set to "REM" Polishing, & then sent to "300 BELOW" for cryogenic treatment. The polishing will add some strength, but better yet, put more power to the ground, and the Cryo, will make the gears as strong as a street gear can be! By the way, i like how your real, and doing this stuff! KICKAZZ CAR YOU HAVE BUILT!
Oh these recommendations work on trans gears, shafts, internal differential gears, shafts, or any steel parts you want to be as strong as possible. Look into 300 BELOW and their Motorsports background! CHEAP INVESTMENT, AND IT WORKS!
Couple pointers that could help; if you TIG the bearing races (just to heat them a lot, but not meld them) and let them cool again they'll be a lot easier to remove. The race expands through the heat but can't because of the casing. So it actually shrinks when heated and when cooling down it'll be slightly smaller. The diff carrier by the way seems to a torsen type, used mostly in Z3s but not in M cars, they have normal clutch LSD carriers. The torsen doesn't have any preload. Another thing, don't forget the crush ring between the pinion bearings :D you also need to reshim the the diff when you replace any part, like the ring or a bearing
As a millwright; put one punch mark on side a and 2 on side b and respectively on the case and also after you pulled the input shaft seal, put a straight edge across the end of the diff input shaft and use the depth stick of a set of verniers to get a measurement for backset. it'll get you close.
The pinion looks like it has a collapsible spacer on the shaft, which will mean there is a rotational torque setting for pinion bearing preload. Very important to bearing longevity.
Gear oil hair care, it's smooth, silky, vibrant, luxurious, this is the real reason you still have all your hair is all the friction modifier on your scalp (generally the friction modifier additive is what gives gear oil that smell).
0:16 Apply a light layer of GL-4 gear oil to your pan, Valvoline is best but other brands work as well. Add your differential ring gear and let it brown on both sides for 4 minutes at 10,000 rpm. Next add the pinion and bearings, cover and let simmer. After 10 minutes remove, from the pan and plate the dish. Garnish with differential shims
10000 rpm? what? XD
I've had gear oil in my hair before too. Dahm is not exaggerating. I barely got any in it and it was there for a week
2:30
I had the same thing happen with my Miata, except is was facing the other direction. I was completely soaked in transfluid from the waist down...and I was wearing jeans
No coincidence that Rob's grindr conversations usually involve a lot of lube.
His grindr conversations involve lots of gear oil, the story of his relationship with it was edited to be family friendly
i love the regular(ish) upoads
It might be too late to tell you now. If you're able to not destroy the old bearings, take a carbide bit to the inside bore of the bearings and you can use them as "set up" bearings. Very useful to have when setting up a diff.
If you turn the whole diff case over 180 degrees you you reverse the output drive direction and keep the drive thrust between the two main gears exactly as they were designed to work! Exactly the same as many race cars that used the VW gearboxes did for years before there were custom gearboxes available.
Rob buddy, I believe the moment that best describes "prolapsing" is when you finally got the pinion shaft loose and the bearing popped straight out of the housing off its races...
16 days until rob shows the world that he's absolutely not fucking around. You got this rob
The forces on the diff gear will be the same either in forwards or revere if ran , however the diff casing strength will be the weak point as will be webbed and reinforced for running in opposite direction
If the fill plug is the same NTP size as a Ford axle, get a Ford axle plug as they have a built in magnet that will pick up metal out of the oil.
This is going to be a completely different beast is awd mode.. You're an absolute mad man in the best way possible
Yo Rob! I've never set backlash on a diff before but I think if you just read the factory manual, they have a much easier way to do the adjustment,,, I believe it involves using a dial indicator! And or maybe some white grease or paint on the teeth
Who the thumbs down these videos? You must be the “haters” of the world. This stuff is absolutely phenomenal
That nice Haas machine of yours would do a good job of machining new rings and possibly pinions for that diff so you could run it the other way around. No longer in reverse.... send it off for induction hardening or something similar and you have unlimited gearing options
If you actually are running the diff backwards you need to do a bit of a re-design. Helical gears will not run properly backwards. What you need to do is put another drain plug in the top of your front cover. That way you can run the diff upside down. When a diff is upside down it will run backwards but with the input shaft turning the same direction. I'm assuming it is upside down though because your front and rear propshafts are running in the same direction. So if that is the case you don't need to worry about it.
correct
5:59 I don't remember. what was the reason Rob didn't track down a front truck IFS diff? also you could just flip the diff over and it would spin the right way. But only if the housing is shaped to coat the ring and pinion correctly and you have a way to fill the housing with a lubricant to the proper level.
If you turn the diff upside down it will be rotating the correct direction
That is not correct. The only thing that would change would be that the wheels would turn the other way. If you use a diff designed for the rear as a front diff, it will inherently run in reverse.
Is it not already being run upside down?
It would be great for burnouts
Wouldn't lube correctly.
Blockbuster2033 you are correct 😅
You don’t shim under the pinion bearing like a Ford? To set pinion depth?
I guess it could go either way. But I was going to shim the race on the pinion and save the crush sleeve for the preload without changing that depth. Honestly this is only my second rodeo 😂
Shims should be between pinion gear and inner bearing. Reusing existing shims will probably get you very close to the right setup. The shimming is usually case specific, not ring and pinion specific. IE the cases and carrier have more machining error than the gears
Pinion should have a + or - number to indicate the pinion variation from “0”.
+5 means the pinion is 5 thou bigger, and you need to compensate by taking 5 thou out of the shim thickness.
-5 means the pinion needs 5 thou added to shim thickness.
If original pinion was +5 and new is -5, the pinion variation cancels and you need no shims.
I re use all my crush sleeves, zero fucks gone 8’s and nines but I still appreciate you
@@ramjet7089 You are correct, using the existing shims will always get you 95% close from experience
The gear oil transmission story is sooo true. Happened with FC transmissions too. 🤣🤷🏻♂️
Could you flip the diff and then use the drive side of the ring gear for strength? The ring will still rotate properly so the oil should still circulate to the pinion maybe with more resistance.. If its got a vent plug it and make another on the new top side / previously bottom
This may be the first video I've ever been able to smell. You aren't kidding about the smell sticking with you.
Tis the season of rob Dahm once again
Can’t wait to see what your racing!!! Iv been watching since I seen this car at SEMA
If you crack the diff housing just buy a block of billet and us that beautiful cnc and back a new one stronger
The countdown begins.🔻🔺🔻🔺
Haha great timing in the video, this this exact same thing earlier today
Rob! be aware that those BMW diff´s don´t like to be driven in the opposite direction!
And cooling specially is a problem with these! even if you don´t change the direction, orientation and the back-(in your case front) cover!
If you ever conceive of driving this thing for longer durations on high speeds, be aware that this thing will overheat and murder itself!
Best wishes from Barbados!!!!
6:00 you could try to flip the case upside down
Thats what I was thinking
@@sbabbittx5 if you do that it has it's consequices but I think you could flip the case and the diff and play with that
Hey Mr. Custom, why not order a custom ring and pinion with the teeth going in the opposite direction to fix the whole diff spinning in reverse shenanigans?
Probably too big for the chassis as it currently sits, but Currie has a 9" IFS center section available. If that were fitted to the four rotor in the future, the gearing choices would be nearly infinite.
Robs help reminds me of Pedro from Napoleon's dynamite. VOTE FOR PEDRO:-)
You could do a 4 clutch lsd in that diff for better lockup, stock is 2 clutch.
You know it's going to get intresting when there is a countdown on days (16 days to race) in the thumbnail 🤓🤓🤓🤓
@Max Power negativity is always pushes us to positivity 🔥🔥🔥 @Max Power keep at it
@Max Power I don't doubt it will run, but it probably shouldn't unless he gets some shielding around his legs/Trans tunnel, and a good bit of testing days before to make sure the chassis feels right accelerating to incrementally higher speeds. And actually go around with a torque wrench and check everything over thoroughly...
@Max Power I can't wait until you lose but we will have to see about that.
haha i committed 2 months ago. its pretty big budget race. I didnt put it together. I will ruin my momentum if i dont show or dont give it my all
@@RobDahm love your work looking forward to the videos
And quick question where is the " HANDSOME FOREIGN WELDER "
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I sont know about everyone else, but I was happy to hear i wasnt the only one who got Transmission oil all over my hair
that much metal in oil, it's definately seen some grinder.
20 second in and I already like it
Gear oil in your hair at 19 is the key for your splendid hair, and not Keeps that you supposedly started putting on in 2020. :D
Fitting a new ring and pinion gear set is one of those jobs that I hate doing. Literally have to take it apart and put it back together many times to get that nice acceptable contact pattern while maintaining correct preload. 😐.
Lmao Rob explaining the gear oil coming out gave me ptsd flashbacks to when I did the same thing with my miata trans.
Hair is lookin feathered and lethal alpha rob.
Oh yes now time for those AWD burnouts🔥
At least you get to shim IRS diffs on a bench. My Mustang diff had me under the car hucking the torsen in and out like a very delicate kettlebell. Really tiring and tedious when your car is not on a lift.
It's a good thing they make percision things to measure things
Isn't the pinion the constant and you shim the ring left and right to set the proper backlash? That pinion does not have a crush collar so the preload on that is the constant.
Pink Sock
first 5 seconds
stack tolerance
roughly 250 seconds in :)
Doesn't the pinion have a crush sleeve on there? Isn't that what's in the middle of the 2 bearings on the shaft?
The very last thing Rob said was "Why the he'll does this gear oil smell like shit?" Lol,,, I think it's from high sulfur content which is similar to rotten eggs. It's also so you don't confuse it with motor oil because you can tell by the odor. Natural gas has Sunkist odorant added called "mercaptan" for safety reasons otherwise it's odorless and you could blow yourself up if striking a switch or match
Rob why not get a copy of the diff internals and make stronger parts on your cnc. Could even reverse the gear direction.
That front diff is gonna break for sure
I've always just left the bearings if there's no score marks on the races. what's it sound like you have... so you have to replace them but I've always gotten lucky just swap the gears out and it's been really close and said screw it and never had a problem.
Love you Rob!
Given the fact that the rotation is now going to be reversed, are the pinion bearings going to be lubed correctly?
There is an oil galley that the ring(in regular rotation) serves as a water-wheel and directs oil into the galley and constantly lubes the pinion bearings.
Hahahaa FLEX on them Rob.. u earned it💪🏾😎
i dont care what the haters say.. i like robs channel. i watch it and ricer miata! haha
7:43 A Ford 8.8 just comes out. Was very easy when I rebuilt my rear in my Foxbody Mustang. But I guess German engineering just had to make it a pressed fit like that.
German machinist employment preservation act. 😇
I’m so excited for you!!!!
"How the hell does this oil... Smell like SHIT" best outtro ever 😂
Minus redesigning the chassis couldn't you flip the diff to make it spin the right direction
Woohoo, no midrolls! Love your work and commitment to educating us all.
The uterus, bladder, and rectum are subject to Proplapse.
def. a slipping forward or down of one of the parts or organs of the body.
Yall need a pneumatic jack for the press. Stupid simple to swap and run it off air. It made my time at the 20 ton so much easier.
I’ve changed the gear oil on my moms truck and my car and understand your hate for it!
Thanks now i know the car i want will be a pain to work on
You will need a new collapsible spacer that fits behind the bearing that sits behind a flange
Peg your diff.
In the land rover world we don't have the best diffs/axles😂 so we peg the diff by have a phospha-bronze Pas running on the back of the crown wheel held in place by some studs through the diff case. This stops the crown teeth walking up the pinion screw and stripping teeth.
Best strength mod you can make
Do you have plans on designing and building your own front diff that doesn’t have to run in reverse? I know there are Ford 8.8 and 9” center section solutions but are larger than the BMW. Toyota FJ80 Land Cruiser 3rd member in a custom center section might work.
put a cover on your electrical panel
2:42
Gear oil in the hair stinking for 3 days after washing it 18 times ....
Yup , been there and the wife will never let me live it down.
That was 20yrs ago, I guess that's love.
Rob you just answered the reason why you use Keeps. It was the rx7 gear oil fault. Lol.
You gotta cnc mill rob make a new one bro lol but you should really by a machinist handbook edition 30 or so by now but there is a lot of useful info u could use. Even like minor diameters on tapped holes to make sure it’s has enough thread engagement
LET'S GO ROBERT!
maybe you should call out to some other german guys for your differential the youtuber phillip kaess is bulding the same BMW differential with an inverted rotation for his audi rs4