TMI pistons
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Senior User
Joined: Feb 2004
Posts: 295
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From: conway arkansas
TMI pistons
according to my calculations, which sometimes are blurry, compression with those keith blacks with a 60 over bore and a .041 head gasket with the piston .019 in the hole the compression should be about 9.3:1, thats with the 14cc step dish as advertised, does this sound right at all to yall
Posting Guru
Joined: Dec 2002
Posts: 2,003
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From: chicago burbs
some calculators use more input info than others. using your inputs and figuring 78cc's for the chamber volume, 4" stroke and 4.1" for the gasket bore diameter, i got 9.09:1 on the calculator i used. http://raceabilene.com/kelly/hotrod/compression.html
how/why are you figuring .019" in the hole?
how/why are you figuring .019" in the hole?
Posting Guru
Joined: Mar 2005
Posts: 2,068
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From: western montana
i thought they were designed as 9.5:1 ? usually a larger bore increases ratio as more cyl is taken below than above the compression chamber volume wise.
big thing is not to under cam and need 95 octane.
big thing is not to under cam and need 95 octane.
