hp loss

Jim Davies jimd at vcc.bc.ca
Sat Mar 13 17:55:26 GMT 1999



On Fri, 12 Mar 1999 Jason_Leone at amat.com wrote:

> <<I have wondered about this myself.  I have heard anywhere from 15%
> to 25% in drivetrain losses.>>
> 
> Typically, expect a RWD front engine car to lose 20%. Expect a FWD front engine
> car to lose 15%. I'd guess a RWD rear engine car would be closer to 15% than 20%
> (ala Porsche). It depends on the individual drive train design, and the
> materials used.

A big factor is the rear axle gearset and especially if it is a hypoid
design and also [I think] how much the actual offset is between the ring
and pinion centreline; the greater the offset, the longer the pinion tooth
becomes, thus increasing friction. I notice spiral bevel gearsets coming
back into production and I believe it is because of the greater drag of
the hypoid design.






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