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got a ppi back...
friend's car. he already bought it. i guess he got his panties all bunched up. he told me the ppi came back with exactly 175 (psi) at every cylinder. does that sound right? i thought there should be some variation. hell, this isnt the space shuttle.
cliff btw 88 carrera. maybe an 87. they didnt consult with me.
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04-23-2004, 05:23 PM
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Join Date: Dec 2002
Location: Dahlonega , Georgia
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When I had the PPI done on my 1983SC last year with 97000 miles on it I had 5 cylinders at 175 and the 6th at 170,when I showed up for the results my mechanic said "buy it",I did and she runs very strong.
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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04-23-2004, 05:42 PM
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Location: Iowa
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I may be wrong, but good compression does not mean you have no problems. When I bought my 88 Carrera, compression test was very good - over 165 - 170 on all cylinders, as I recall. As months past I found I was adding a quart of oil every 400 miles and finally took it in for a top overhaul. Mechanic who did the overhaul (Fischer Motors in Chicago) said the valve guides were shot and it had two bent valves.
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John C 1988 911 Carrera coupe 2002 BMW 530 Last edited by Decolliber; 04-23-2004 at 08:32 PM.. |
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04-23-2004, 05:53 PM
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Location: Hollywoodland
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Regarding the compression test, the important thing is that you want to gather consistent readings across all of the cylinders so no worry there.
What does the leakdown look like? Wayne states that the most comprehensive test that you can perform on your engine is a leakdown test. |
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04-23-2004, 06:00 PM
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Location: Long Beach CA, the sewer by the sea.
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If there's a problem, the leak down willl help isolate that problem with respect to whether it's a valve (int or ex) or rings. If I had good compression, I would see no need to go any further. Neither a leak down nor a compression test will detect worn guides unless the guides have contributed to valves having gone bad. And now we're back to where we started.
When we did leak downs on kart racing motors, we did the whole motor to determine if there were any induction leaks, but that isn't done on a multi cyl motor commonly that I know of. I'll bet the race guys do this though. Maybe Grady will weigh in on this. |
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04-23-2004, 06:17 PM
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so it isnt strange that all 6 cylinders were bang on at 175? i guess i expected some variation.
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04-23-2004, 06:32 PM
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Broke
Join Date: Apr 2004
Location: California Foothills
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Cliff, you have mail
Brian
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Beer is proof that God loves us and wants us to be happy. B. Franklin 93 968 Cab 81 SC Targa (Princess) Now Residing in Denmark 1973 RS Z28 Vash will never own it! |
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04-23-2004, 06:36 PM
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