Variable Compression, Variable Displacement you decide

Gary Derian gderian at cybergate.net
Wed Feb 18 21:05:02 GMT 1998


Roger,
    Don't forget that too much boost at low RPM will cause great stress on
the connecting rods and crankshaft.  Boosted motors need the inertia of the
pistons to balance out some of the gas loads.  My question is,  why do you
want to have all of this complication?

Gary Derian <gderian at cybergate.net>

>Gary wrote:
>>
>> I don't think this would be practical.  I think you would need an
alternator
>> and motor in the 20 to 30 hp range!  Its best to have the correct size
atmo
>> engine for the intended use.  Superchargers and turbochargers are only
>> useful if an auto company doesn't have the engine it wants.  Adding boost
to
>> an existing car is cheaper than designing a new engine.
>> Gary Derian <gderian at cybergate.net>
>>
>>
>> >>It occurs to me, that you could make an electric supercharger (big one
not
>> >>the little ones some have now) by putting a generator where you would
>> >>normally put the supercharger, and then putting an electric motor
>>
>>
>>
>
>I was actaully figuring more like 40hp, but I have seen ones that are
>getting close to that size.  Also this may become more practical with
>the hybrid vehicles since they already have the generator of much
>bigger than necessary.  They would only need to add the motor.  Also
>you could use a much smaller capacity Motor/generator pair and only
>overdrive them for short periods of time, and maybe even add a cooling
>system to them to improve capacity.
>
> Roger




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