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Old 03-17-2005, 17:46   #1 (permalink)
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Tech Question RE Compression Calculation 302w

Fellas,
Bit of a tricky one here, a bit out of my league.

A friend has a 302w block that has been decked 30thou.
He has some 302w heads from the 70's i presume that have been shaved 60thou. He hasn't calculated the cc size.

What compression would this see the little 302w producing? And what would the chamber cc size be given they have been shaved 60thou.
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Old 03-17-2005, 17:53   #2 (permalink)
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Re: Tech Question RE Compression Calculation 302w

Personally I'd bolt the heads on and check PV clearance. Then you can accurately test compression also. I don't know how much you can deck/shave before you run into problems on the 302. You cc the chambers with a syringe.
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Old 03-17-2005, 18:58   #3 (permalink)
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Re: Tech Question RE Compression Calculation 302w

If you have taken 60 thou off your heads, you will have to throw them away, as they will be no good for a performance buildup. You have enough problems with standard thickness decks, let alone ones with a whopping 60 thou lopped off.
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Old 03-17-2005, 22:24   #4 (permalink)
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Re: Tech Question RE Compression Calculation 302w

Just trying to figure out compression here, can you put a figure on it?
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Old 03-18-2005, 05:46   #5 (permalink)
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Re: Tech Question RE Compression Calculation 302w

You will need to CC the heads to calculate the compression ratio.

Here is the formula

Compression Ration =

Cylinder vol. + clearance vol. + piston Comp. vol. + gasket vol. + chamber vol. divided by Clearance vol. + piston vol. + gasket vol. + chamber vol.

If you need an explanation of what is involved here is a great link.

http://www.carcraft.com/techarticles/982/
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Old 03-18-2005, 06:08   #6 (permalink)
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Re: Tech Question RE Compression Calculation 302w

Fresh 1965 , thats like asking " how long is a peice of string " you cant guess things like that , you need measurements to get some idea .
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Old 03-18-2005, 16:17   #7 (permalink)
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Re: Tech Question RE Compression Calculation 302w

http://www.rosspistons.com/calculator.php
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