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11-22-2009, 04:21 PM | #1 |
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Compression ratio calculators??
I've used a few different sites that come up with 3 different numbers.
Specs are 3.484 bore, 3.976 stroke, 10.2 cc dome, deck height 0, gasket thickness .074 gasket bore 3.51. Cylinder head volume 48 cc's The sites I've found vary by as much as 2 full points (13 to 1 up to 15 to 1) Using the same input data (some of the sites don't ask gasket bore size) I would think it shoulkd be within half a point.
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Art Leong 2095 SS |
11-22-2009, 06:07 PM | #2 |
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Re: Compression ratio calculators??
You have a PM
You have more than enough
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Adger Smith (Former SS) Last edited by Adger Smith; 11-22-2009 at 06:24 PM. Reason: SP |
11-22-2009, 06:08 PM | #3 |
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Re: Compression ratio calculators??
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Jim Carter 2340 Super Stock 2340 SST/2340 Stock Set another place at the table |
11-22-2009, 08:39 PM | #4 |
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Re: Compression ratio calculators??
I find this site is real simple for numerous race calculations:
http://users.erols.com/srweiss/index.html
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Jeff Lee 7494 D/S '70 AMX |
11-22-2009, 10:26 PM | #5 |
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Re: Compression ratio calculators??
What gets me is I get 15.70 on one site 14.62, 16.30 on another
This is with putting the same numbers in Some take in to account the head gasket bore others don't. But it shouldn't come to 2 full points. I think there is a formula in an old rule book I can do on paper.
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Art Leong 2095 SS |
11-22-2009, 10:44 PM | #6 | |
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Re: Compression ratio calculators??
Quote:
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Former NHRA #1945 Former IHRA #1945 T/SA |
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11-22-2009, 11:00 PM | #7 |
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Re: Compression ratio calculators??
Ed I have my front mounted parachute on that hood
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Art Leong 2095 SS |
11-22-2009, 11:23 PM | #8 |
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Re: Compression ratio calculators??
Art,
I think there is a formula in both the How to Build Books. Both Small Block and Big Block. I have it on my shop computer and will PM it to you tomorrow. It will come out with in a .00 of what I sent you. Adger
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Adger Smith (Former SS) |
11-22-2009, 11:36 PM | #9 |
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Re: Compression ratio calculators??
Useing your info. Above i got 13.540:1, normally aspirated at sea level........this is an older computer program i use with sprint car
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11-23-2009, 09:05 AM | #10 |
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Re: Compression ratio calculators??
I'm going to run the motor the way it is. But I was perplexed at the variation in the different programs. I wonder if the calibations are done by nhra in different divisions LOL.
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Art Leong 2095 SS |
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