Quote:
Originally Posted by tadd
The non-counterweight cranks will spin to 7-7.5k if you keep an eye on them (and the case). The lower moment will let it spin up nice and quick.
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I have been interested in the T crank debate for some time now and realising you have a strong engineering backgound would be inerested in looking at some of the arguments in more detail.
I can agree that reduced inertia does allow the engine to spin up more quickly as the torque needed to accel the inertia will be reduced but does it make any practical difference when accelerating a car?
I think that the main benefit of lower inertia is with downshifts as the only torque available for decel is engine friction and low friction motors need very low inertia to slow effectively.
I don't know the difference in inertia between the S and T cranks to try to do some first order calcs but it must be small.
I also feel that to build a 2.0 litre race motor that will only rev to 7.5K is a bit limiting and will struggle to be competitive.
I think E Cams or even Solex cams will be a long way behind these days and even the S cam is not enough.
I would think a competitive 2.0 litre needs to make a minimum of 200BHP and run to at least 8500rpm.