Re: Turbo on bikes

A turbo on a single cylinder Four stroke engine will have pulsed rotation and so not an option...If 2 or more cylinders are in use then it is a probability.
Compressors driven by engine is the way to go since it will have continuous pressure .....Kawasaki H2 is a shining example of this...

Re: Turbo on bikes

I have one question assume that we are able to fit in a tourbo within exisiting bikes dont you think the power surge will sudden and not linear which is recommended for two wheelers ?

Re: Turbo on bikes

Apparently neither the turbo charger worked , nor the crank driven supercharger on so called pro street 700.
That kind of knowledge base does not exist yet in India , to tune an engine which started life as NA. Just putting on a turbo and hoping engine would survive without changing ign timing/ AFR with reviewable data is plain stupid.
I have seen and heard numerous turbo/supercharger projects where the guy claimed it easily faster than before , eating sbks and what not but never ever people post data certifying these claims . not even video logs!


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Re: Turbo on bikes

A Turbo even on inline 4 engines have pulsed rotation. Case study-
An engine making 15psi boost @ 1500rpm( we have plenty of such engines in market)
So 1500rpm is 25rps - out of which we get 1 exhaust pulse per two crank rotation (4stroke)
= 12.5 exhaust pulse Per second per cylinder.
Now 4 cylinders make it 12.5*4=50 pulses per second.
Now these pulses are coming from individual cylinders (300-400cc or so)of the inline engine , but Turbo doesn't know who is sending him these gifts .
So a 400 or so cc cylinder if puts out 50 pulses of exhaust per sec, it is good enough to get well into big boost territory ( 14-15psi) . For doing that a single cylinder would need to do 4 times higher rpms - 1500*4=6000rpm
I guess there are plenty of single cylinder engines capable of doing that. Even @4000rpm you will get 3-6psi boost.

Please check the mathematics , I think there is something wrong, it is sounding too easy.

So that pulsed rotation theory is just internet gyan , turbo on on any engine is going to have pulsed rotation.

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Re: Turbo on bikes

A single cylinder engine will need a large buffer area to ensure smoother exhaust. Generally speaking, low cc engines does not have the necessary back pressure to run a turbo. Moreover, tuning a carb bike to run on turbo will be a nightmare since it'll have to be able to fuel at rapidly differing pressures. A fi bike can be better for this purpose but still the pressure needed to run a turbo is still a doubt.

Re: Turbo on bikes

Do you feel that way or you have some mathematical expression for smooth exhaust hypothesis?
But of course tunening a Turbo with a carb and no o2 sensors and no data recording is trying to shoot in the dark.

Just in last post it was concluded that a 400cc cylinder can make good boost at 6000rpm.


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Re: Turbo on bikes

It's a hunch actually. But any chamber on the exhaust pipe will act as a buffer zone to smoothen out the peaks.

Yes a 400cc+ engine can produce boost from turbo. But considering the fact that bike engines are already more stressed, adding turbo will cause unexpected engine damage. Using exotic materials to counter this wil lead to higher cost. Add to this the necessity of an intercooler since a bike has short inlet tract. BTW, a supercharger will provide linear boost which will be better suited for bikes but efficiency will take a hit marginally.

Re: Turbo on bikes





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Re: Turbo on bikes

Offtopic question: Say an exhaust developed for Duke 390, can it be used for Duke 200?