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07-12-2012, 04:57 PM | #1 |
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Join Date: Apr 2012
Posts: 61
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compression test
just tested the compression and they were all around 65 , 66 and one was at 58 or 59. What should they be at. What would a HC head be at. Thanks Guys
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07-12-2012, 05:01 PM | #2 |
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Join Date: May 2010
Location: Qld, Australia
Posts: 4,211
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Re: compression test
Testted my 5.5 last week, all 90 psi with the eng cold and throttle open.
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07-12-2012, 05:12 PM | #3 |
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Join Date: Jan 2012
Posts: 3
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Re: compression test
Depends on the altitude. In Albuquerque, a 6:1 Snyder's head will will yield about 72 to 75 psi. An original head will yield about 50 psi. Also a engine bored out to .125 over will yield higher pressures. In Texas, Louisiana, California (ie sea level) numbers would also be higher.
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07-12-2012, 05:36 PM | #4 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: compression test
As long as all are within 10% they are good.. Not all compression gauges are created equal,, there can be quite a difference between them.. There are also a number of contributing factors such as how recent the engine has been run, whether done hot or cold,, whether throttle was open or closed,,etc.. Sounds like yours are OK.. Mine happen to be 45#..
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07-12-2012, 07:37 PM | #5 |
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Location: MN
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Re: compression test
If it's a stocker around 65 is good to go. Like Patrick said, best within 10lbs. Compression tests are best done with a warm or hot engine, or so I have been told.
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07-12-2012, 09:48 PM | #6 | |
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Location: Bucks Co, Pa
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Re: compression test
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Terry Quote:
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07-13-2012, 07:20 AM | #7 |
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Location: ca.
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Re: compression test
stock i thought was around 55# , my 6-1 is 100# .
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07-13-2012, 09:27 AM | #8 |
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Join Date: Apr 2012
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Re: compression test
How does the 6.1 run. I just ordered a 5.5 because i was not sure about the 6.1
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07-13-2012, 11:07 AM | #9 |
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Join Date: May 2010
Location: Jordan, MN
Posts: 1,411
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Re: compression test
6:1 is claimed to add a couple hp over the 5.5:1. The 6:1 is still not available from the manufacturer but should be soon.
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07-13-2012, 02:33 PM | #10 |
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Location: Claremont, CA 91711
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Re: compression test
I am running a 'C' (Model B) head on a stock Model A engine that is bored .080 over. The compression tested 80 psi. I have no idea what the compression ratio is with the 'C' head.
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07-13-2012, 11:22 PM | #11 |
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Re: compression test
Model B head with cast C is 4.6 CR as opposed to 4.2 CR of A head.
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07-14-2012, 07:27 AM | #12 |
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Re: compression test
my 6-1 is a 5.5 shaved .060 . 100# in each hole . runs good .........
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