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09-18-2019, 07:57 AM | #1 |
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How many cc’s??
How many cc’s are stock heads? How many cc’s are Snyders 6:1 heads? I have a post saved from a few years ago where Bob Johnston says a 5:5 is 149 and a 6:1 is 137. According to Snyders catalog a 6:1 is 152. Who is right?
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09-18-2019, 10:42 AM | #2 |
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Re: How many cc’s??
I have a chart in my book, done by Dave Barker some years ago, showing compression ratios using different bore sizes. It shows 155 for standard bore, 6:1 head. And it shows about 240 cc's for 4.2:1.
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09-18-2019, 12:23 PM | #3 |
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Re: How many cc’s??
I bought a head and it measures 125 cc. Just trying to figure out the compression ratio of it.
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09-18-2019, 02:22 PM | #4 |
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Re: How many cc’s??
This site has an on line calculator. Just plug in the numbers. http://www.csgnetwork.com/compcalc.html
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09-18-2019, 10:01 PM | #5 |
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Re: How many cc’s??
@Vanspeed. Buy Jim's book!
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09-20-2019, 11:32 AM | #6 |
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Re: How many cc’s??
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09-21-2019, 09:36 AM | #7 |
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Re: How many cc’s??
Wouldn't any piston pop up negate the the added cc's for the gasket thickness? For example if the block had been decked or other reasons.
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09-21-2019, 09:47 AM | #8 |
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Re: How many cc’s??
Good point redmodelt! Yes, piston pop-up means fewer cc's of combustion chamber volume. It's normally about .015" but should be measured. At least .040" clearance should be maintained between the piston and the head as rods will stretch at high RPM's.
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09-23-2019, 10:42 AM | #9 |
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Re: How many cc’s??
Thanks for the info guys. I have yet to pull the stock head to measure piston pop up if any.
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