Head Gasket suggestions
#41
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My new set of graduated cylinders arrived and I made my measurements this afternoon. 3.445 for the bore (just bored 0.020' over), flat of piston to deck is 0.006', volume with piston 1" down is 130cc and the combustion chamber is 99cc. Throw this all in the sheet and you get 9.02 with the std tin gasket and 8.72 with a 0.035 gasket. I guess I am a little surprised since both the head and block had material removed.
93 octane (R+m)/2 is readily available. Is a 9.02 compression acceptable? I'm still a little concerned with sealing with the std payon gasket. It the copper head gasket spray a good or bad idea?
Thanks again for all the input!!
93 octane (R+m)/2 is readily available. Is a 9.02 compression acceptable? I'm still a little concerned with sealing with the std payon gasket. It the copper head gasket spray a good or bad idea?
Thanks again for all the input!!
Last edited by Cass3958; 08-28-2022 at 05:09 PM.
#42
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I think you should be ok. I have used both the stamped sheet metal gaskets and the composite gasket and both work. The sheetmetal gasket is fussier about a smoothly machined surface on the block and head, and the composite gasket is more forgiving.
EDIT: if it makes you feel more comfortable, then go with the standard thickness composite gasket. That will drop the compression a bit and give you a little more margin against detonation. 93 AKI is good fuel though. As a general rule, engines require less octane to not detonate as elevation increases and temperature decreases. So Denver in January will need less octane in the same engine than Houston in July.
EDIT: if it makes you feel more comfortable, then go with the standard thickness composite gasket. That will drop the compression a bit and give you a little more margin against detonation. 93 AKI is good fuel though. As a general rule, engines require less octane to not detonate as elevation increases and temperature decreases. So Denver in January will need less octane in the same engine than Houston in July.
Last edited by Jagboi64; 08-28-2022 at 10:22 PM.
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Glyn M Ruck (08-28-2022)
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