[Spridgets] Spridget heads

[Larry Daniels]

Billy, you need to add the volume of the hole in the (compressed) head 
gasket as well as the volume of the cylinder above the rings to the volume 
of the combustion chamber.  Then you add that total volume to the 
displacement volume and divide the sum by the cc/unswept cyl/head gasket 
volume to get the CR.  Unfortunately, I don't know what the gasket and 
unswept volumes are.

LAD


----- Original Message ----- 
From: "Billy Zoom" <billyzoom at billyzoom.com>
To: "William McLeod" <wbmcleod at gmail.com>; "Spridgets List" 
<Spridgets at autox.team.net>; <vintage-race at autox.team.net>
Sent: Sunday, November 30, 2008 11:13 AM
Subject: Re: [Spridgets] Spridget heads


Just out of curiosity:
> http://drcwww.uvt.nl/~bogaard/heads.htm
I assume that if you put a head from a larger engine on a smaller block, you
could mill the head to bring up the compression, but how do you run a head
with a displacement of 21.4 cc on a 1275? Wouldn't that give you nearly a
15/1 ratio?  318.75 divided by 21.4 =14.895
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