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Compression numbers- should I be concerned?
Just getting ready to start my 76 2.7 after sitting for 10-15 years, did a compression test and got the following numbers. Will the numbers improve once the engine is started and runs for awhile. looked inside cylinders with a scope and everything looked good, no rust, pitting etc. Engine has 65,000 miles on it.
1- 110 2- 140 3- 80 4- 110 5- 130 6- 140
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1976 911 Targa 2.7 CIS Sienna Metallic /Diamond Sahara # 436-9-3 - Red Interior 1963 356 SC- crashed  1962 356 C- sold 1965- 912- sold- fun but too slow Last edited by matt gineo; 04-02-2012 at 03:43 PM.. Reason: typo |
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04-02-2012, 03:42 PM
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Registered
Join Date: Apr 2009
Location: Cape Vincent, NY
Posts: 841
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the 80 is low, but you may want to run it up to temp and then retest to make sure the rings are seated well and everything is expanded. a little heavy oil in each cylinder if still low will tell you if it is the rings.
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1968 911S "Leona" Air goes in and out, blood goes round and round, any variation on this is a bad thing. |
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04-02-2012, 05:00 PM
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did you do a valve adjustment?
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83 SC Targa -- 3.2SS, GT2-108 Dougherty Cams, 9.5:1 JE Pistons, Supertec Studs, PMO ITB's, MS2 EFI, SSI's, Recurved Dizzy, MSD, Backdated Dansk Sport Stainless 2 in 1 out, Elephant Polybronze, Turbo Tie Rods, Bilstein HD's, Hollow 21-27 TBs, Optima Redtop 34R, Griffiths-ZIMS AC, Seine Shifter, Elephant Racing Oil Cooling. |
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04-02-2012, 05:44 PM
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I'd drive it a little bit and monitor that low cylinder. Could be dirt or corrosion on the seat or valve/stem. May clean itself up, I would be hesitant to do an adjustment until it is clean as it is unlikely to have gone out of adjustment during storage. Good question Brad as the dirt or corrosion could have given an erroneous gap.
Dan |
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04-02-2012, 08:04 PM
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Thanks, yes I did adjust the valves.
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1976 911 Targa 2.7 CIS Sienna Metallic /Diamond Sahara # 436-9-3 - Red Interior 1963 356 SC- crashed 1962 356 C- sold 1965- 912- sold- fun but too slow |
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04-03-2012, 04:15 AM
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Red Rocket
