Date: Thu, 13 Jan 2005 06:33:01 GMT From: Malcolm William Mason <mwm1(spam)nospamedu> Subject: Re: Re: H engine in 9-5?
On Thu, 14 Oct 2004 21:43:23 GMT, hohnospamlid.invalid (Goran Larsson) wrote: >In article <2t86t1F1q8vqkU1nospamberlin.de>, >Dave Hinz <DaveHinznospamcop.net> wrote: > >> Less material and less surface >towards the cylinder walls reduce friction and reduce fuel consumption. >Just look at the pistons in the pictures; from the old B202 piston to a >piston from a formula 1 engine. The B2x5 (Trionic 7) piston is closer >in appearance to the F1 piston than to the B202 piston. > Sorry for the long delay!!!!! The big reason for reduction in piston size is that piston mass is reduced and therefore reversal losses have been reduced. This is increasingly important as revs go higher since the reversal loss varies as the square of the piston velocity. Sorry again but the profession has had me out of town and then I was in Canada with the family for an extended holiday season. Malcolm
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