Thread: compression ratio
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01-23-2006 06:32 PM #1
compression ratio
I am working on a sbc and I was needing to know what the easiest way to calculate compression ratio is
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01-23-2006 08:32 PM #2
Re: compression ratio
Originally posted by shawn74
I am working on a sbc and I was needing to know what the easiest way to calculate compression ratio isPLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.
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01-24-2006 05:51 AM #3
Great link Richard, thanks a bunch. I bookmarked the CR calculator. Got to start working up some numbers for my motor guy on that 514!!!!!Yesterday is history, tomorrow is a mystery, Live for Today!
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01-24-2006 06:04 AM #4
I like this calculator because of it's simplicity. I got it book marked for a quick reference. www.campbellenterprises.com/chevy_pistons.htm It's quick, and easy to make changes and also gives the cubic inches while calculating compression.Last edited by camaro_fever68; 01-24-2006 at 06:10 AM.
RAY
'69 Chevelle--385
'68 Camaro--Twin Turbo
'78 Luv--383
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01-24-2006 06:08 AM #5
Make sure your figure DCR (dynamic compression ratio) as it is a better way to determine what ratio works with the camshaft you choose. 9.0:1 could be too much or not enough, depending on your cam specs. You want to shoot for something between 7.5-8.0:1 DCR to run on pump gas with iron heads.
Lynn
'32 3W
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01-24-2006 01:26 PM #6
Originally posted by DennyW
About 8.82:1 on 87 octane gas, so 9.1:1 should be ok on premium.
The rule of thumb for a "relatively stock" engine is about
9.5-10.0:1 on 93 octane (R+M/2 method).
The compression ratio you can get away with depends on a
great many factors...cam timing, intake/exhaust flow
quantity & quality, ignition timing, air/fuel ratio, operating
RPM, etc.PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.
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