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PAT4's Avatar
 
Join Date: May 2003
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technical advice about 2.2 T compression test

Hi gurus... I do not have comparisons tests and I don't how many bars (Psi) should have an engine with good health (1 bar = 14.504 Psi). Nominal CR for a 2.2 T is 8.6

Any advice about my test is welcome


Old 03-22-2006, 03:20 AM
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I've always hear that 17 was the comp. ratio factor. So in your case: 17 X 8.6= 146.2 lbs., or 10.07 bars. Hope that helps.
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Old 03-22-2006, 05:03 AM
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So it feels that my piston rings are very tired ...
Old 03-22-2006, 07:05 AM
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I think without a leakdown test, you don't know for sure that rings are the problem, and I wish I was positive about the factor of 17. There are plenty of really sharp folks here. Maybe one of them will chime in.
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Old 03-22-2006, 03:14 PM
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any other advice ?
Old 02-06-2008, 11:06 PM
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Your compression numbers are pretty even, and that is good, "no cow on the ice" as we say in Sweden

To see if your rings are worn or valves don't seal as good as they should you will need a leak down test.
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Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
Old 02-07-2008, 12:34 AM
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I just looked it up and you are correct. 1 Bar =14.5 PSI. If that Holds true then the PSI numbers seem to be on the low side. I found my 2.2 in a junk yard and did a cold compression test and all of them were in the 135-145 range. Before you hit the panic button do yourself a favor and get a different tester and measure again. Remember that the motor needs to be warmed up first and if it is Carburated the throtles need to be fully open while doing the test. Dont forget to keep turning the motor over until the needle stops
Old 02-07-2008, 10:12 PM
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and remove all spark plugs to make it turn over more easily, otherwise it can drain the battery so it turns slower on the last cylinder than on the first.
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Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
Old 02-07-2008, 10:42 PM
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1. Warm up the engine
2. Do a test with plugs out and throttle wide open
3. If C/R is even (+-5%) on all cylinders, you are probably OK
4. Squirt some oil into cylinders and redo the test. Compare with "dry" test.
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Thank you for your time,
Old 02-08-2008, 07:53 AM
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My 2,2 - Weber carbed (unknown history) tested 140, 145, 135, 140, 145, 140 at Vision Motorsports.

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71 911T Miss Demeanor / 2013 Audi Q5 Hundeführer / 1995 993 Miss Adventure
Old 02-09-2008, 01:00 PM
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