What head is this? - The Ford Barn

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What head is this?

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06-06-2023, 08:24 PM

JayJay

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Join Date: Jan 2020

Location: SF Bay Area

Posts: 2,678

Re: What head is this?

Quote:

Originally Posted by Y-Blockhead

Cylinder Displacement + Combustion Chamber Volume / Combustion Chamber Volume = Theoretical Compression Ratio.

Y-B has given the definition of compression ratio. Practically speaking, most folks simplify it as

*measured compression test pressure divided by 14.7 = compression ratio.

So the "standard" psi of say 62 psi would be 62/14.7 = 4.22 (round to 4.2). And a 5.2 head would be around 75 psi on a compression test.

JayJay

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1931 Briggs S/W Town Sedan

It isn't a defect, it's a feature!

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