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Registered
Join Date: Dec 2002
Location: Kentucky
Posts: 447
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Compression Test
How should I do a compression test on a 86 951? My dad is taking the car for a test drive for me and I thought maybe he should do a compression test before I buy it. Can somebody give me some step by step instructions I can send to my dad? I did a search but didn't find exact procedure. Thanks.
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1986 951 1983 944 |
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05-24-2003, 07:19 PM
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Registered
Join Date: Oct 2002
Location: Lawrenceville, NJ
Posts: 97
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Compression Test Procedure
Here you go dude:
1: Make sure car has a healthy battery, and engine is warmed up. 2: Unplug fuel pump fuse and run car until it stalls, this will clear the fuel rail, leave fuse out for remainder of test 3: Block throttle plate wide open with a screwdriver. 4: Remove the plugs and air cleaner (preferably) 5: Insert compression guage into corresponding cylinder* 6: Crank engine over until guage shows no further rise, usually 4 or 5 compression strokes. 7: Record readings as you go for comparison, the lowest cylinder shouldn't read 10-15% below the highest cylinder. *Make absolutely sure that the compression guage fitting is the same length as the spark plug threads!
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Even though I drove a GT2, I still love my 944. |
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05-25-2003, 10:05 PM
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Join Date: May 2002
Location: Fairfax VA.
Posts: 409
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You may also want to have a battery charger hooked up between readings. The starter will turn slower and slower with each crank. My Interstate battery was gasping for breath by the time I got to my final pull! ;_0
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The crashes people remember, but drivers remember the near misses. – Mario Andretti 1991 944S2 Rally #951 Rally-America.com |
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05-25-2003, 10:51 PM
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