Will The TURBO Pit Bike Run?? + BIG Problem…
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- Опубликовано: 2 окт 2024
- If you haven’t seen the last pit bike video make sure to check it out and get caught up to speed on what we’re trying to do here! Long story short, I bought a snowmobile turbo and am attempting to slap it on my 110cc pit bike! After rebuilding pretty much the entire bike from the frame up, it’s sitting on about 5” taller wheels and tires than it previously had and way more travel and length in all the suspension! It’s definitely going to be a one of a kind build and who knows how it’ll end up in the end! Be sure to subscribe so you won’t miss any of the updates videos and post about it!! ALSO this who follow my built Duramax videos, some new s300 Duramax videos coming up!
#dirtbike #pitbike #builtnotbought #turbo #mechanic #motocross
Cool project man! I rarely comment on stuff, but this is right up my alley! Cheers from Denmark 😁
Good deal man, I appreciate that! Thanks for the support!
Turbo's don't add any power without sufficient plenum volume, and don't let anyone tell you different. Plenums are PARAMOUNT, especially on small singles and twins. A turbo small engine without plenum volume will barely make any more power than stock, and it will often starve the engine so bad it won't even make wastegate boost level. Hence why you see so many turbo pitbike builds on youtube that look slow and barely squeak out 6psi. No Plenum = no power.
You can't run a turbo in draw-thru configuration without running carbon seals, which require custom machining on anything other than a t25 based turbo. It's smoking partly because of that, but also because of how your oil drain is setup. It needs to be close to straight down and above oil level, where you tapped into the case is probably at or below oil level. NEVER use a restrictor on a journal bearing turbo. Restrictors are for Ball Bearing turbo's only, and even then, they're a case-by-case basis.
Find a way to make a mini-plenum in such a way that doesn't allow the fuel to puddle, fix the oil drain, and add an adjustable powerjet (google it) to fatten up the main circuit, so that you don't have to swap brass every time you need to add fuel. A final word of caution about draw-thru setups - they are way more complex than they look, and if you ever build a street bike, getting them to get good fuel economy, be reliable, AND make power is very difficult. So if you're having trouble getting it dialed in - welcome to the club.
This really helps clear up some questions I’ve had about it and thank you for taking the time to spell it out for me! I will definitely take all this into account on trying to further this build 🤙 thanks again!
@@SlapDi.KSpeedShopI saw some guy gokart using a small tank as a capacitor for the boost to build up, since the mono cilinder have long pulse. Also for the stator i think its the blue wired that give power for light, at least on atv maybe gapping the ring larger for more heat tolerance since the raise the compression.
Thanks for the info I will definitely keep that in mind! I will have to order some more parts but it will be back!
I would attempt this setup by using a facet diesel fuel pump to pump the turbo oil. Those little engines need every bit of oiling possible, they can't spare any especially under boost. You may need to upgrade the stator and run a battery.
A turbo that is setup to run wet is a must, VW air-cooed motors run wet turbos sometimes,if you need examples or parts look to the sand rails for advice. Your going to need some revs to get it to work right, get ready to melt clutch parts and stiffen up the springs to lay the power down. You'll get it going if you stay at it
Your oil is probably backing up in the return because you've put the pipe in the bottom of the clutch cover casing. Block it off and make it higher, then it can return. Also a draw-through carb needs no pressurisation.
Thanks for the feedback, we will have it dialed in soon! Once parts get back from the machine shop we’ll have a new video on it and hopefully have all those issues fixed like you said.
Keep it coming!
Cool looking build. Im no rocket scientist but im not sure you need to pressurize the fuel tank/carb, since the turbo is pulling from the carb. You will likely just need to tune the carb with bigger jets.
Pressurizing the bowl the way it is will just make it run to rich in my opinion.
From my knowledge you only need to pressurize the bowl of the carb
When the turbo is pushing the boost through the carb. (Carb placement between turbo and engine) because then you'll want to equalize the pressure.
Ok I'm late to the party but 1st you should switch to a blow through set up. Then you simply put a boost referenced fuel pressure regulator between the electric fuel pump and the carb and set it up to add pressure 1:1 for lbs of boost + needed at the carb fuel pressure. So if your engine needs 5lbs of fuel pressure and you generate 2lbs of boost then you need to feed the carb 7lbs of fuel pressure. get it? Next, these small engines were never meant to feed oil to anything but the engine. You need an external sump with both an electric feed pump and an electric scavenge pump to send the oil back to the sump. End of problems!
PS. You need to have the oil pump come on before you start the engine up as there needs to be oil in the turbo before it starts spinning, otherwise even a couple of seconds of dry run will pooch your turbo!
Hmmm try to put a Garett GT06 turbo inside instead
I do not think the turbo is bad. They do not flow alot at all, especially when they are cold and oil is cold. But the main thing is they are NON sealed journal bearings(?) they will always leak a little. You have the turbo in the vacuum side of the circuit. That is where you are pulling in the air so it wont idle and where the oil is coming from. That smoke is from oil being sucked into the intake and going through combustion chamber. Good luck. I have no oil restrictions besides tubing length on a gy6 and I burn no oil, but carb is between turbo and intake.
I think we’re finally getting somewhere. Haven’t messed with it a whole lot lately but since the carbon deal was installed after that video, it seems to be doing a lot better. Also with changing the oil return and building a plenum I think we’re on the right track. Thank for the comment!
the smoke is not to much oil these turbos need alot of oil
its 1 or youre turbo seals are dead or the oil cant get out the of turbo fast enough so the oil is backing up in the retour line
Yes I’m definitely figuring that out, we will eventually get it dialed in, I’ve never attempted anything like this so it’s all a big learning process so maybe one day I can do it on something bigger and faster and be able to make it work! Thank for the feedback!
@@SlapDi.KSpeedShop hey yeah atm iam puttig a turbo on my honda grom iam using an external oil pump since the engine is not realy making pressure and i can regulate the oil flow. and dont forget to add a plenum i know it sucks to get it on in a tight bike but the bike needs it mine is making around 10psi and iam trying to improve that
So lly kit works just need lly intake manifold ? Plus wanna see how u did fuel feed lines
Yes passenger intake manifold and new intercooler boot since the turbo is slightly bigger. Then I bought a rubber boot from the face of the turbo to my turbo inlet pipe and you got I will put that in there!
Quality
New videos coming soon?
Yes!! Stay tuned 😎