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Registered
Join Date: Sep 2003
Posts: 124
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Are these compression numbers OK?
140 on five cylinders, 150 on the 6th. Is this OK? What is the acceptable range?
How is a 6 - 8% leak down test on all cylinders. Is that OK? |
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07-26-2004, 11:49 AM
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don't know about leak down but your compression numbers are just fine. They should be within 10%
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Tim 1973 911T 2005 VW GTI "Dave, hit the brakes, but don't look like your htting the brakes...what? I DON'T KNOW, BRAKE CASUAL!!!" dtw's thoughts after nearly rear ending a SHP officer |
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07-26-2004, 11:55 AM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Both are good.
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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07-26-2004, 11:57 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,497
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On a leakdown, ideal is less than 5%, over 5% and something is showing some wear.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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07-26-2004, 11:57 AM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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I was just about to edit my response when Kurt logged in. 5% or less is best. How many miles on the engine? If you have 100k or more, I think 5-8% is to be expected.
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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07-26-2004, 12:04 PM
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Registered
Join Date: Dec 2003
Location: Arapahoe County, Colorado, USA
Posts: 9,032
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ICD,
Where are you located? Altitude makes a large difference in compression measurement. Kurt, Tim, and Paul are right on. Everyone should record these measurements on a regular basis for a baseline for your engine. How do you know you have, or are developing, a problem if you don’t know the history? Best, Grady
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ANSWER PRICE LIST (as seen in someone's shop) Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 |
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07-26-2004, 12:12 PM
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Registered
Join Date: Sep 2003
Posts: 124
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The car in question is an '87 Carrera. The car is in Kansas City. It has 115k on it., but it had a valve job around 55K.
The bottom line question is this: Will this car need valves or rings any time soon with these test results? |
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07-26-2004, 01:06 PM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,497
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No guarantees, but probably no.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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07-26-2004, 01:08 PM
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1973 Porsche 911 2.4 MFI
