O/T Compression ratio and supercharging

SPECTRO COATING CORP. spectro at ma.ultranet.com
Wed May 26 21:22:19 GMT 1999


-----Original Message-----
From: Don.F.Broadus at ucm.com <Don.F.Broadus at ucm.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, May 26, 1999 4:08 PM
Subject: RE: O/T Compression ratio and supercharging


>You are correct, The mechanical compression ratio can be 10:1 but when you
>check it with a gauge the effective compression ratio
>pressure will  be on par with a 9:1 engine. Mechanical compression gives
you
>efficiency while effective compression ratio that is controlled by valve
>timing gives you knock control and good combustion.


Kinda explains the 18:1 compression ratios used in all out racing engines,
Doesn't it?




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