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Registered User
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Help with leak down numbers
Hello, fellow 930 owners. I love my 930 very much but as time goes on I wonder if my future involves expenditures other than a vintage Porsche. I recently had some minor work done on the car and had my mechanic do a compression and leak down test. these are the numbers and I am wondering if these are good numbers.
CYL 1, 115 PSI, 3% LEAKAGE CYL 2, 110 PSI, 5% LEAKAGE CYL 3, 115 PSI, 3% LEAKAGE CYL 4, 115 PSI, 3% LEAKAGE CYL 5, 115 PSI, 3% LEAKAGE CYL 6, 110 PSI, 4% LEAKAGE Any thoughts? Tom G |
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83 911 Production Cab #10
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While the PSI are "low" (normally around 160 for a 3.2 NA), there is less than 5% differential between the high and low which is good.
This may be due to the way it was done (time on, temperature, gauge and so on). As for the leak down, they are pretty good. I'm sure that some Turbo expert will chime in.
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Who Will Live... Will See ![]() ![]() ![]() 83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger |
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Banned
Join Date: Nov 2007
Location: Rockwall, Texas
Posts: 8,559
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Leakage( 5% and under) and compression (110-120) numbers for a turbo engine with a 7:1 static compression ratio are excellent.
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83 911 Production Cab #10
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He can now relax...
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Who Will Live... Will See ![]() ![]() ![]() 83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger |
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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looks good. how many miles
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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I've gone native
Join Date: Sep 2011
Location: Long Island, NY
Posts: 1,695
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Great numbers
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Registered User
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Thanks very much for your input. 77,000 miles on the odo. I feel better.
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