Speaking from experience, having learned the hard way... When I got my first car (nitro slash 2wd), before I did any research I got the RBInovations supercharger. It ruined my engine within a couple months. It was always lean no mater what, it was always bogging, terrible to start. It fried the stock starter motor setup. I never even experienced the engine without the super charger when I first started. Shortly after it was dead I found the Bugs channel haha. I learned my lesson and everything I needed to know and should have known going in. After I replaced the crank, piston, rod, sleeve and bearings it Was scary the difference. Soon after that I got an 11k carb, then an o.s. 21tm, and now I run a monster .21 drag engine. Thanks for all the info and dedication to the hobby, theBug404!
Hey man you're very welcome! And it sucks when that happens. A lot of people also don't understand that you can't blow through a carburetor without a boost sensor to add extra fuel to keep it from leaning out and going pop! That company is so full of shit unfortunately. Thanks for watchin! 💯🤘🏻🍻
I usually find that when people try to oversimplify more complex mechanical engineering they wildly miss the important details. Nice informative video :)
Thanks man I know this video was kind of all over the place but it's a lot to remember especially when playing with things in trying to record it all at the same time without a script haha will be more later! Thanks for watchin! 🍻🤘🏻💯
Pretty much every sirio engine .21 size or bigger (I believe) uses a 14.2x25.3x6mm rear bearing. Boca bearings makes them for a pretty decent price. You can still get the actual sirio bearings, but they’re like double the price or more as Boca
Air doesn’t go into the crankcase of a Detroit like a typical 2 stroke. It gets blown directly into the cylinder. The bottom rings are to prevent the blower from pushing air into the crankcase when the top piston rings and piston seal off the cylinder ports from the blower.
The machining tolerances needed for a scale supercharger to make boost are quite high. Those RB innovations superchargers are just a fan attached to a rubber band, they probably can’t even move enough air to force it out the exhaust in the first place. All they do is create an intake restriction and a drag on the crankshaft. Still, people in the FB groups pay good money for these gimmicks because they think it looks cool.
One thing that is most people dont tink is that carburettors in general also tolerate no boos but if placed in front of the super charger can actually work increase flow without interrupting the fuel in the carburettor by the extra pressure but yes on a two-stroke it is better to change the carburetor and THE pipe
The two stroke engine already has forced induction. As the piston descends it compresses the mixture in the crankcase and when the transfer ports open the mixture is forced into the combustion chamber.
@@thebug4046 yes, I get that. Hence I pointed out the fact that two strokes use forced induction to work. I really do not want to get too far into the subject of forced induction on two strokes but basically (as you said) it is not applicable to our little engines.
Would you still recommend the dynamite.19? Or something different? I have a 10-15 y/o T-Maxx 3.3 with a pretty rough rod. I was gonna rebuild it and get an 11k carb and a tuned pipe. But after that I’d be well past the price of a Dynamite .19. The other engine I was thinking about is the OS 21. But that’s even more $$$
To be honest the 19 isn't bad but there's no parts support for it it's a throwaway unfortunately I gave up on those a couple years ago that's kind of why it went back With a 3.3 because the part's availability is always there the OS21TM is really nice but hard to find parts for sometimes. or really expensive depending on your budget
@@thebug4046 damn that’s unfortunate. I guess for the price though. The 19 still wins at least in my area. A new sleeve, piston, connecting rod and bearings would be well over 99$
@@Troubledboy88 the 3.3 is 330$ here new so it's pretty common for us to rebuild them. The the os 21tm piston and sleeve is 200$ here the whole engine is 480$ but definitely the 19 runs good in just a shame it's not supported
@@thebug4046 not supported with rebuild parts? Damn your prices are insane! Hmm, well thanks for the food for thought. I’d like to get a 19 but it’d suck not to be able to rebuild
@@Troubledboy88 The OS is supported with rebuild parts but the problem is they're always on a back order and take months to get. Is what I mean and I think the 19 is 110 🇺🇸 still witch isn't bad
They say you can tune it to add fuel with the boost. I’m still gonna try it cause this didn’t make since to me 80% overdrive of boost should force some type of less resistance on the motor at least. And where is the boost supposed to go other than your exhaust? Everything comes in the intake and goes out the exhaust I thought?
yeah because as soon as the transfer ports are uncovered the exhaust port is uncovered at the same time which means whatever boost you created just goes out the exhaust along with your fuel or mixture there's no way to trap the boost or what little boost you can actually make these RC superchargers are just a joke they will actually reduce your performance as well as make your engine to an extremely lean. Witch makes you think you are making power when you're not. If you overdrive it again the problem is he will create a whole bunch of pressure in the carburetor which will overcome the fuel pressure and basically make it not run or not run properly. It's like a lot of people tell you if they actually worked everybody would be using them it was just a gimmick that came out around 20 years ago
@@thebug4046 yeah I’m just wondering tho like it only loses boost at the very bottom of its rotation and it’s a blower so it makes the boost back pretty quickly how much boost can it trap before reaching the top of its rotation and firing?
@@thebug4046 they got a few videos breaking them down and explaining how they make them and they seem pretty well built I mean yes it’s a extra strong rubber band but what else would you use for a 10th scale blower 😂 idk I bought my slash trophy truck to make a late model but my local track doesn’t have classes for nitro so I figured I’d just no prep it like my electric slash
That funny the super charger you showed is actually in one of the rigs at my shop you can actually convert it to a power adder if you swap the guts out of it we talked about it several times only the case can be used the internal parts are way different some one actually tryed to steal it off the truck believe it or not in our yard crazy tweekers
Makes sense! We had one in the shop off my old man's 671 I got to pull it apart to do seals was pretty cool. And can't leave anything without someone ass messing with it unfortunately lol
from my understanding if you wanted to use nitrous couldn't you make it also inject more fuel at the same time by adding a valve that controls both the nitrous and that extra fuel?
You could but then your adding a ton of extra weight By trying to figure out a solonoid system a fuel pump and a whole bunch of other stuff just to have a boost of power for a few seconds to destroy the glow plug over and over again. Maybe if you are drag racing or something but even those guys don't bother with all the headaches of trying to make it work
The biggest problem with these super chargers or turbo chargers for these small nitro engines is you can’t set timing …your throwing so much air you’d have the engine to rich …
You CAN set timing with glow engines... That is EXACTLY what different temp glow plugs, AND increasing or decreasing compression using head shims IS for.
And YES, it IS possible to boost one of these little glow engines. But first of all, it'll take a proper charger, NOT a little plastic fan blade running off of a rubber band to the crank, and second, it would take a PROPER pipe designed exclusively FOR boost. These little engines are boosted in STOCK form by way of a rotary intake valve, and the use of the downward piston to pressurize the A/F charge that is trapped in the crankcase by the rotary intake valve. Extra boost from a proper charger is simply going to up the pressure that is already in the crankcase. It will then take a proper designed exhaust pipe to take advantage of the extra pressure and reflect more of it back to the engine that escapes out of the exhaust port before the piston closes it back up. Little 50cc gasoline 2-strokes, that work just the same as these engines do, HAVE been successfully boosted before, and have set land speed records on bikes. I have also seen nitrous work on glow engines fairly well. Sure you do have to run them slightly rich, but NOT bog rich. The secret to getting the nitrous to work properly is to take advantage of the pressure line coming from the exhaust to the fuel tank that we have on all these engines. You put a larger nipple in the pipe so that when the nitrous is active, the extra pressure in the pipe from the extra power feeds enough extra fuel to the spray bar to enrich it enough for the N2O. It takes trial and error to find the right size tap in the pipe, BUT, it does work when it's right.. 👌
Since you have airplane engine I have nitro engine plane with 56” wingspan, what is good engine for that plane I put os 40la engine on it and I think it’s to small for it
Hey bro how are you fine and well I pray but I have a problem, I let my 3,3 revo warm up, roll it up and down the street a couple of times then it just QUIT on me. But will start back up, can you diagnose this problem for me please????
Hey if you are on Facebook join the Nitro RC enthusiast group I'm an admin in there if you post up a video I will respond in there! It's easier then trying to guess over RUclips 💯🤘🏻🍻
So since supercharger is off the board anybody know a good motor with more power than the 3.3 that will fit in the revo with little modding big block mount is fine but every engine I find on forums are discontinued its like rc died after 2010 based on looking at the forums long question but thanks in advance
i always say to rc guys when they talk about turbos or chargers if it works. al the big 2stroke manufactures like honda suzuki , yamaha , old go cart names enz woud have made it but the didint why do you think that is ?? hahah your totaly right
@@thebug4046yes and they still do but most people haven’t seen or messed with sleds to know. but its not really a power adder more less just for use at high altitudes.
Just for information there are two-stroke engines that absolutely need a super charger to work example a multiple cylinder two-stroke engine that shares the same crankcase a good example the ops b20 a marine engine equipped with a super charger the engine needs of a constant flow in the crankcase a pressure. Constent to route the fuel into the cylinders otherwise the gas is pushed from one side to the other and the carburetor sucks almost nothing Now another example a radial with cox 7 cylinder cylinders I believe and this engine is fitted with a single crankcase with a custom made super charger but there are several examples of super charge engines for nitro model OS example did a look for a 120 sp sp is for super charged gang take A look To... os fs 120 surpass sp 😉
I have seen a few of the radial Cox engines but they didn't have any sort of forced induction just a reed valve like what you would find on a dirt bike as well as a normal RC carb. There is a lot of different 2 stroke designs out there. some of which yes are forced induction but for the RC hobby especially these type of engines it's just a gimmick.
Well for engines designed with a real super charger function with methanol exists and it's engine really works but for the little fan blower so call says super charger haha no it does not work we are talking about real pressurization system search for cox radial super charger Multi-cylinder two-stroke engine with the same crankcase they use a super charger for the simple reason that it doesn't work, and yes it does exist, glow engine design for a super charger its just super rare we learn every day ruclips.net/video/j4AM6Zz44gE/видео.html
2 stroke and 2 cycles the word is Used interchangeably but are both the same thing. and yes Detroit 2 stroke uses the blower to pressurize the air box in order for it to run I actually my old Ford F700 work truck had 8v71 in it was a blast to drive 😉 but my point here was that the super Chargers for the RC cars do not work and a lot of the people are comparing it to be too stroke or if you will too cycle Detroit which are a much different type of 2 stroke or 2 cycle engine. There is a lot of confusion about that in the hobby
Speaking from experience, having learned the hard way... When I got my first car (nitro slash 2wd), before I did any research I got the RBInovations supercharger. It ruined my engine within a couple months. It was always lean no mater what, it was always bogging, terrible to start. It fried the stock starter motor setup. I never even experienced the engine without the super charger when I first started. Shortly after it was dead I found the Bugs channel haha. I learned my lesson and everything I needed to know and should have known going in. After I replaced the crank, piston, rod, sleeve and bearings it Was scary the difference. Soon after that I got an 11k carb, then an o.s. 21tm, and now I run a monster .21 drag engine. Thanks for all the info and dedication to the hobby, theBug404!
Hey man you're very welcome! And it sucks when that happens. A lot of people also don't understand that you can't blow through a carburetor without a boost sensor to add extra fuel to keep it from leaning out and going pop! That company is so full of shit unfortunately. Thanks for watchin! 💯🤘🏻🍻
I usually find that when people try to oversimplify more complex mechanical engineering they wildly miss the important details. Nice informative video :)
Agreed and thanks man!
Loving this series!
Thanks man I know this video was kind of all over the place but it's a lot to remember especially when playing with things in trying to record it all at the same time without a script haha will be more later! Thanks for watchin! 🍻🤘🏻💯
Pretty much every sirio engine .21 size or bigger (I believe) uses a 14.2x25.3x6mm rear bearing. Boca bearings makes them for a pretty decent price. You can still get the actual sirio bearings, but they’re like double the price or more as Boca
Yeah I was looking into it and they want $79 per bearing which is ridiculous!
Air doesn’t go into the crankcase of a Detroit like a typical 2 stroke. It gets blown directly into the cylinder. The bottom rings are to prevent the blower from pushing air into the crankcase when the top piston rings and piston seal off the cylinder ports from the blower.
Listening to you speak I’m sure you know that and misspoke just clearing it up for others that may see this.
Yup! Of course. I Have worked on several but just said it the wrong way
The machining tolerances needed for a scale supercharger to make boost are quite high. Those RB innovations superchargers are just a fan attached to a rubber band, they probably can’t even move enough air to force it out the exhaust in the first place. All they do is create an intake restriction and a drag on the crankshaft. Still, people in the FB groups pay good money for these gimmicks because they think it looks cool.
One thing that is most people dont tink is that carburettors in general also tolerate no boos but if placed in front of the super charger can actually work increase flow without interrupting the fuel in the carburettor by the extra pressure but yes on a two-stroke it is better to change the carburetor and THE pipe
Exactly
The two stroke engine already has forced induction. As the piston descends it compresses the mixture in the crankcase and when the transfer ports open the mixture is forced into the combustion chamber.
Yes But we were talking about people using superchargers on nitro engines which don't work
@@thebug4046 yes, I get that. Hence I pointed out the fact that two strokes use forced induction to work. I really do not want to get too far into the subject of forced induction on two strokes but basically (as you said) it is not applicable to our little engines.
Also, there is exhaust valves on the detroits. Most people that make the claim have no idea what they are talking about.
Yup! I see it all the time. But the Detroit 2 stroke !! Nope not the same thing bud lol
😂😂😂😂😂 dude u make me chuckle....well said
No worries bud glad you enjoyed it 🍻🤘🏻
Would you still recommend the dynamite.19? Or something different? I have a 10-15 y/o T-Maxx 3.3 with a pretty rough rod. I was gonna rebuild it and get an 11k carb and a tuned pipe. But after that I’d be well past the price of a Dynamite .19. The other engine I was thinking about is the OS 21. But that’s even more $$$
To be honest the 19 isn't bad but there's no parts support for it it's a throwaway unfortunately I gave up on those a couple years ago that's kind of why it went back With a 3.3 because the part's availability is always there the OS21TM is really nice but hard to find parts for sometimes. or really expensive depending on your budget
@@thebug4046 damn that’s unfortunate. I guess for the price though. The 19 still wins at least in my area. A new sleeve, piston, connecting rod and bearings would be well over 99$
@@Troubledboy88 the 3.3 is 330$ here new so it's pretty common for us to rebuild them. The the os 21tm piston and sleeve is 200$ here the whole engine is 480$ but definitely the 19 runs good in just a shame it's not supported
@@thebug4046 not supported with rebuild parts? Damn your prices are insane! Hmm, well thanks for the food for thought. I’d like to get a 19 but it’d suck not to be able to rebuild
@@Troubledboy88 The OS is supported with rebuild parts but the problem is they're always on a back order and take months to get. Is what I mean and I think the 19 is 110 🇺🇸 still witch isn't bad
Thanks man really helped me understand thank God I ain't buy a supercharger yet
No worries!
They say you can tune it to add fuel with the boost. I’m still gonna try it cause this didn’t make since to me 80% overdrive of boost should force some type of less resistance on the motor at least. And where is the boost supposed to go other than your exhaust? Everything comes in the intake and goes out the exhaust I thought?
yeah because as soon as the transfer ports are uncovered the exhaust port is uncovered at the same time which means whatever boost you created just goes out the exhaust along with your fuel or mixture there's no way to trap the boost or what little boost you can actually make these RC superchargers are just a joke they will actually reduce your performance as well as make your engine to an extremely lean. Witch makes you think you are making power when you're not. If you overdrive it again the problem is he will create a whole bunch of pressure in the carburetor which will overcome the fuel pressure and basically make it not run or not run properly. It's like a lot of people tell you if they actually worked everybody would be using them it was just a gimmick that came out around 20 years ago
@@thebug4046 yeah I’m just wondering tho like it only loses boost at the very bottom of its rotation and it’s a blower so it makes the boost back pretty quickly how much boost can it trap before reaching the top of its rotation and firing?
@@thebug4046 they got a few videos breaking them down and explaining how they make them and they seem pretty well built I mean yes it’s a extra strong rubber band but what else would you use for a 10th scale blower 😂 idk I bought my slash trophy truck to make a late model but my local track doesn’t have classes for nitro so I figured I’d just no prep it like my electric slash
I just went and watched a runaway Detroit they rev up crazy fast dude had to plug the turbo to stop it
Yeah when the rock is stuck at full fuel or the blower seals are gone it's pretty terrifying I have experienced at 1st hand haha
I think the rear bearing size for the Sirio is 14x25x6 but not 100% sure. Best bet would be to remove the bearing and measure it(Assuming it has it)
I got the outside race but the inside Ceases to exist. Haga
@@thebug4046 Damn that sucks. Can you measure the crankshaft diameter? Just round up to get the ID of the bearing.
That funny the super charger you showed is actually in one of the rigs at my shop you can actually convert it to a power adder if you swap the guts out of it we talked about it several times only the case can be used the internal parts are way different some one actually tryed to steal it off the truck believe it or not in our yard crazy tweekers
Makes sense! We had one in the shop off my old man's 671 I got to pull it apart to do seals was pretty cool. And can't leave anything without someone ass messing with it unfortunately lol
oh boy a detroit runaway goes to the moon
If it's the rack at full fuel about 3000 rpm witch is pretty high for a big diesel.
from my understanding if you wanted to use nitrous couldn't you make it also inject more fuel at the same time by adding a valve that controls both the nitrous and that extra fuel?
You could but then your adding a ton of extra weight By trying to figure out a solonoid system a fuel pump and a whole bunch of other stuff just to have a boost of power for a few seconds to destroy the glow plug over and over again. Maybe if you are drag racing or something but even those guys don't bother with all the headaches of trying to make it work
Nice explanation on tuned pipes. It makes all the difference in a two stroke engine. Ah and yeah, those RC superchargers are BS lol.
100% man
Preach it !!!! ❤❤
The biggest problem with these super chargers or turbo chargers for these small nitro engines is you can’t set timing …your throwing so much air you’d have the engine to rich …
The other problem is you are trying to blow through a carburetor with no way to increase fuel pressure over boost making it run lean as hell.
You CAN set timing with glow engines... That is EXACTLY what different temp glow plugs, AND increasing or decreasing compression using head shims IS for.
And YES, it IS possible to boost one of these little glow engines. But first of all, it'll take a proper charger, NOT a little plastic fan blade running off of a rubber band to the crank, and second, it would take a PROPER pipe designed exclusively FOR boost.
These little engines are boosted in STOCK form by way of a rotary intake valve, and the use of the downward piston to pressurize the A/F charge that is trapped in the crankcase by the rotary intake valve. Extra boost from a proper charger is simply going to up the pressure that is already in the crankcase. It will then take a proper designed exhaust pipe to take advantage of the extra pressure and reflect more of it back to the engine that escapes out of the exhaust port before the piston closes it back up.
Little 50cc gasoline 2-strokes, that work just the same as these engines do, HAVE been successfully boosted before, and have set land speed records on bikes.
I have also seen nitrous work on glow engines fairly well. Sure you do have to run them slightly rich, but NOT bog rich. The secret to getting the nitrous to work properly is to take advantage of the pressure line coming from the exhaust to the fuel tank that we have on all these engines. You put a larger nipple in the pipe so that when the nitrous is active, the extra pressure in the pipe from the extra power feeds enough extra fuel to the spray bar to enrich it enough for the N2O. It takes trial and error to find the right size tap in the pipe, BUT, it does work when it's right.. 👌
Since you have airplane engine
I have nitro engine plane with 56” wingspan, what is good engine for that plane I put os 40la engine on it and I think it’s to small for it
Go with a .60 2 stroke glow engine should have enough balls to get er done
@@thebug4046 thank you man
So what if you made a nitrous injection system with its own carburetor, so that when you triggered it it would also add fuel?
If you felt like going through all that then sure you probably could. It would have to be set up like what you would find on a normal NOS car system.
On Amazon right now there is a .36 Force engine for sell if your buddy looking for 5.9 XL engine 150$ 👌✌️👍💯🍻🏎️🛠️
Thanks for the heads up! But he just sold the 2 XL savages he said he didn't like them because they were to big! Lol
thanks man almost made the payment
No worries
Hey bro how are you fine and well I pray but I have a problem, I let my 3,3 revo warm up, roll it up and down the street a couple of times then it just QUIT on me. But will start back up, can you diagnose this problem for me please????
Hey if you are on Facebook join the Nitro RC enthusiast group I'm an admin in there if you post up a video I will respond in there! It's easier then trying to guess over RUclips 💯🤘🏻🍻
So since supercharger is off the board anybody know a good motor with more power than the 3.3 that will fit in the revo with little modding big block mount is fine but every engine I find on forums are discontinued its like rc died after 2010 based on looking at the forums long question but thanks in advance
The OS 21TM is a direct fit without modification. I know trying to put ⅛ big blocks in can be a pain in the ass
@@thebug4046 hell yeah Ill probly end up with that one
Steve morris of nitro engines
So your saying my 700 shot of nitro or 25 pounds of boost isn't going to turn my savage in to a rocket 😂😂😉👌✌️💯🛠️🏎️ LOL
Oh bit time! Full send! 💯🤘🏻🤣
i always say to rc guys when they talk about turbos or chargers if it works. al the big 2stroke manufactures like honda suzuki , yamaha , old go cart names enz woud have made it but the didint why do you think that is ?? hahah your totaly right
I think ROTAX did a trubo 2 stroke sled but the engine was designed specifically for it and they didn't make many. But yes you are right
@@thebug4046yes and they still do but most people haven’t seen or messed with sleds to know. but its not really a power adder more less just for use at high altitudes.
Air density
Yup
Just for information there are two-stroke engines that absolutely need a super charger to work example a multiple cylinder two-stroke engine that shares the same crankcase a good example the ops b20 a marine engine equipped with a super charger the engine needs of a constant flow in the crankcase a pressure. Constent to route the fuel into the cylinders otherwise the gas is pushed from one side to the other and the carburetor sucks almost nothing Now another example a radial with cox 7 cylinder cylinders I believe and this engine is fitted with a single crankcase with a custom made super charger but there are several examples of super charge engines for nitro model OS example did a look for a 120 sp sp is for super charged gang take A look To... os fs 120 surpass sp 😉
He covered that in detail around the 3-minute mark, including the supercharged 4 strokes.
I have seen a few of the radial Cox engines but they didn't have any sort of forced induction just a reed valve like what you would find on a dirt bike as well as a normal RC carb. There is a lot of different 2 stroke designs out there. some of which yes are forced induction but for the RC hobby especially these type of engines it's just a gimmick.
Well for engines designed with a real super charger function with methanol exists and it's engine really works but for the little fan blower so call says super charger haha no it does not work we are talking about real pressurization system search for cox radial super charger
Multi-cylinder two-stroke engine with the same crankcase they use a super charger for the simple reason that it doesn't work, and yes it does exist, glow engine design for a super charger its just super rare we learn every day ruclips.net/video/j4AM6Zz44gE/видео.html
A Detroit diesel engine is not a 2 stroke. it's a 2 cycle engine. The engine won't run without the roots blower. Still naturally classed as aspirated.
2 stroke and 2 cycles the word is Used interchangeably but are both the same thing. and yes Detroit 2 stroke uses the blower to pressurize the air box in order for it to run I actually my old Ford F700 work truck had 8v71 in it was a blast to drive 😉 but my point here was that the super Chargers for the RC cars do not work and a lot of the people are comparing it to be too stroke or if you will too cycle Detroit which are a much different type of 2 stroke or 2 cycle engine. There is a lot of confusion about that in the hobby