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Compression ratio calculation

To: Spridget List <spridgets@autox.team.net>
Subject: Compression ratio calculation
Date: Thu, 18 Apr 2002 20:24:17 -0700
The rebuild of my 948 is nearing completion, and I turned to David Vizard's
"Tuning the A-Series Engine" for instructions on determining the compression
ratio.

For any of you who are familiar with David's book, or the whole business of
C/R, I would appreciate your help.

My copy is the 3rd edition, published in 1999. On pages 222-223 he gives the
procedure for C/R calculation. What I'm missing is the gasket volume and the
ring land volume. In Fig 9.42 David gives these figures for 850/948 engines,
but not for 998/1100 or 970/1071/1275 engines. My 948 is bored out to a
standard 998 bore (2.542 in), so that's the info I need. Confusing me more,
he gives a couple of examples in the text on page 222 and 223 quoting gasket
and ring land volume from Fig 9.42, but I can't see where the numbers come
from.

Hopefully I'm just blind or something. Anyone?

TIA,
Doug Ingram
Victoria BC
1958 Sprite  (AN5L/636) soon getting a renewed heart!
1963 Sprite Mk II project (HAN7L/30003) cryogenically preserved for now....

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