RS246.com Forum :: The World's #1 Audi R, S and RS Enthusiast Community

Basically, I am crazy!! I need a company who can manufacture a very small turbo. The gtr12's are still too big. I have bored a mini moto engine out to 57cc-60cc and need a turbo that can spool up from those gases. Reason being is I want it to be one of a kind!! Also wants to be a similar design to a kkk with an internal waste gate and a actuator mounted on it! If anyone can provide me with information I would be very grateful! Also, I have sent emails to turbo techniques (something like that!) and turbo dynamics asking them. If they come back with anything then that would be great however, does anyone have any past experiences with this company?
Cheers,
Dave.

I have no idea who could do this but I WANT TO SEE THE FINISHED PRODUCT!

Getting serious, how many cylinders, and how big are they?

LOL, its got 1 cylinder with a width of 43.8mm. It equates to around 60ccc, i pretty much have cooling and lubrication sorted just need a turbo!

Perhaps something like this?

Only kidding, but I think you'll struggle to find something. The sort of applications you would expect to see engine's of that size are things like Chainsaw's, etc. Don't know if anyone would go to the trouble of turbo charging when looking for more power as a slightly larger engine (ie: for a bigger chainsaw) would still be a comparatively small engine.

Another thing is that I'm not sure how suitable a one-cylinder engine would be for spooling a turbo as the exhaust gas flow would be very 'on/off'.

Best of luck though, sounds like an excellent way to learn about engines.

Perhaps supercharging would be a better option?

Is the engine 2 stroke or 4? 2 stroke wouldn't like a turbo attached...

Good point Mark! If it is 2 stroke it will depend on whether it is a normal 2 stroke or uses a vane or reed valve - I would imagine that a reed valve might cause problems. The effect of charging (either via turbo or supercharger - which could be a better option to consider) will cause the crankcase pressure to be higher and will therefore have a detrimental effect as the downward stroke of the piston will be hindered.

Perhaps have a word with a kart manufacturer - say zipkarts in Hoddesdon (if they are still going that is).

Paul

David.... if its 2stroke, you would probably max out power with dykes ring & piston, port the mutha like its going out of fashion, skim head finished with an expansion system ex..... which it may have anyway.. put together well should last a week or 2 ......

I used to tune my mopeds..... had the fastest '50 in berkshire ... topping a great 85mph on the flat ...... (it did have a 6spd box & 100cc racing barrel/head on it) ...
was good on runs down the coast reguarly L plates removed...

Ahh...the days of Yamaha fizzies! (FS1E's)......That's just given away my age.

lol, yes its a 2 stroke and uses a reed valve, i see what your all saying but how would i supercharge the bugger?

You'd have to drive the supercharger off the output shaft of the motor via some gearing I guess. But I still think you'll have troubles:-
a) too much pressure from the charger could keep the reed valve open
b) too much pressure into the crankcase could effectively slow the descent of the piston on the power stroke.

My guess is that you could only use light pressurisation from a charger.

Paul

I think in this instance there is no substitute for cubic capacity.

Fancy a 125cc Mini Moto? Or even a 250!

stick a turbonator on it...worked for pikey with his 600bhp RS4

s4woody wrote:stick a turbonator on it...worked for pikey with his 600bhp RS4

PMSL!!
@ Markb, the whole reason i am doing this is it will be unique, different, and i love the mini moto i have now! Oh, btw it has NOS aswell!

Harper--D wrote: @ Markb, the whole reason i am doing this is it will be unique, different, and i love the mini moto i have now! Oh, btw it has NOS aswell!

Good for you! Hope you get it to work