No, you're not blind. I had the same questions, but since I'm not to the
stage where it matters I hadn't asked the question yet. I wonder if one of
the older editions has the info.
In the event the info is not available, you can figure it out yourself:
The gasket volume can be calculated the same way as the cylinder volume -
you just need to know the compressed thickness of the gasket you're going to
use.
The land volume could be calculated also - you can figure the area of the
cylinder minus the area of the piston and multiply that by the distance from
the top of the ring to the top of the piston.
HTH
<dnw>
1972 Midget
1998 Safari
1999 9-3
1964 (me)
----- Original Message -----
From "Doug Ingram" <dougi at shaw.ca>
To: "Spridget List" <spridgets@autox.team.net>
Sent: Thursday, April 18, 2002 11:24 PM
Subject: Compression ratio calculation
> 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?
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