Motorbike 80cc Turbo Charger

[DAMIEN1307]

I want to put a turbo on my engine

If turbos actually worked on these 2 cycle China Girl motors, don't you think this would have been done already many years ago and mass produced just like the motors???...lol...There are folks that are actual engineers, even here in the forums that have not been able to do this...lol...Just saying.

I am sure that some of our more knowledgable members like @ImpulseRocket89, @Chainlube, @DieselTech, @RubiconTom, @Street Ryderz, or @Sidewinder Jerry, possessing more advanced technical skill sets will chime in sometime today and tell you just why this probably cannot be done and will not work on 2 strokers such as our China Girls.

 

[DieselTech]

I think you are going to need a bigger china doll engine. Kinda like Fat Bottomed Girls!!!

 

[DieselTech]

If turbos actually worked on these 2 cycle China Girl motors, don't you think this would have been done already many years ago and mass produced just like the motors???...lol...There are folks that are actual engineers, even here in the forums that have not been able to do this...lol...Just saying.

I am sure that some of our more knowledgable members like @ImpulseRocket89, @Chainlube, @DieselTech, @RubiconTom, @Street Ryderz, or @Sidewinder Jerry, possessing more advanced technical skill sets will chime in sometime today and tell you just why this probably cannot be done and will not work on 2 strokers such as our China Girls.

This might be a option, it's a belt driven supercharger. It's designed for the big zenoah 2strokes. It made by RB INNOVATIONS, I'm pretty sure they offer different models, & different pitch compressor wheels. Lmao maybe I need a 1/5scale rc car now to justify the purchase!!!

 

[DieselTech]

The bad thing about turbos is they require a constant oil supply to the turbocharger. Plus a return oil line.

 

[Chainlube]

The bad thing about turbos is they require a constant oil supply to the turbocharger. Plus a return oil line.

Plus a high pressure pump and holding tank.

 

[ImpulseRocket]

The bottom end of these engines wouldn't be able to handle more than a few PSI of crankcase pressure, and even then I suspect the crank seals or middle case seal would just blow out on the power stroke.

The 2 biggest challenges to forced induction on a 2 stroke are crankcase sealing and cooling. Especially cooling. Seeing as these engines can't even handle 15 minutes at 7000rpm and 30 mph before getting a bit too toasty on a hot day... Getting one of these to not soft seize, assuming it doesn't just blow out seals and gaskets, would be a challenge all on its own.

 

[Street Ryderz]

When getting into heavily modified 2t's there are alot of factors you MUST understand!
How many of you know what the c.c.r. even is? I can tell you it's not just a few p.s.i. and the difference between 1.2 and 1.4 is double, a typical quality 2t has 1.4 !
Set up is key to a good performing and long lasting two stroke, an understanding and knowledge of how the 2t works makes a big difference in the outcome.
If you can't run your engine at 7k rpm for 15 min there is something very wrong! These engines can run prolonged at 10-11k without issue when setup properly and not over heat or do anything destructive.
Turbo's have been used by many people and manufactures with great success but as stated above with the use of an ecm which made this much more viable.

 

[DAMIEN1307]

How many of you know what the c.c.r. even is?

You are so right...lol...Most folks think c.c.r. stands for Creedence Clearwater Revival...lol...lol.

 

[ImpulseRocket]

If you can't run your engine at 7k rpm for 15 min there is something very wrong! These engines can run prolonged at 10-11k without issue when setup properly and not over heat or do anything destructive.

You left out a key part of what I said. "On a hot day." No matter how good the setup is the cooling on most of these engines is barely sufficient for prolonged high rpm WOT runs when the temps climb past 90 degrees. They just don't have the surface area.

You won't convince me otherwise without proof that is contrary to what myself and others have experienced. You oversimplified something with a complex number of variables.

Even if what I said isn't true, it doesn't change the main points I was making. They couldn't handle the heat from forced induction. Period. Not for any practical amount of time at least.

The crankcase are also not that adequate for any real pressurization that would make it worth putting said turbo on said engine in the first place.

Show me a video of a 66cc engine with a turbo pushing at least 5 to 7psi, without any special modifications, at wide open throttle for a sustained run of several minutes under said boost pressure and I will concede.

Until you do that, continuing the argument is moot.

I would also love to see these 11k rpm capable 66cc engines. They aren't coming out of the box capable of that.

 

[DAMIEN1307]

"On a hot day." No matter how good the setup is the cooling on most of these engines is barely sufficient for prolonged high rpm WOT runs when the temps climb past 90 degrees. They just don't have the surface area.

I wouldn't even dare to do this here in the high desert where we have had multiple days of 110*F temps for days at a time.
Those are the days I only make very short runs to the store and back again, and only if I really, really, have to...lol.


Ps...Here in the US, we can get to very high temperatures that are not usually experienced in SR's home country of Canada though...Maybe in Canada, because of the lower ambient temps he has there, might be the reason he is able to hold those higher rpm's for as long as he can do so, because the ambient temps do not get that high up there in the north country as it does down here in the States.

I have been in Toronto even during the height of summertime and it was so much cooler there than It was In New Hampshire or Massachusetts before driving on up there.