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looking to do leakdown/comp test
hey all. i really want to try doing a leakdown/compression test on my 911. seems pretty easy!! i have a few questions. i know nothing about air compressors. what size air compressor do i need. any recomendations on what brand? also where can i find a good leakdown tester. thanks
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07-15-2012, 05:48 PM
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Northern Motorhead
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Aircraft Spruce sells good leak down testers ... you want the one with a .040 orifice for use with a 5 inch or less diameter piston.
Any compressor which will provide 100 psi is good although some people use 80 psi to do the leak down test for whatever reason. Cheers ! Phil
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Cheers Phil 89 Coupe,Black,95 3.6 engine and the list goes on ... 1983 944 SP2 race car PCA #96 |
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07-15-2012, 05:58 PM
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83 911 Production Cab #10
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The normal flat pancake type 3.5 Gallon (135 Psi, variable) is fine...
As low as $50 but P-C is a good one for $100 3.5 Gallon 135 PSI Pancake Compressor-PCFP02003 at The Home Depot
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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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07-15-2012, 06:00 PM
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Registered User
Join Date: Feb 2011
Location: Bellevue, Wa
Posts: 2,437
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DO NOT remove all the spark plugs at the same time for the compression test
it can be a very bad experience - just sayin' one at a time
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Ed M 86' Coupe |
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07-16-2012, 05:40 AM
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Northern Motorhead
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Benz,
You want something like this with a 14mm extended adaptor ... maybe do a little reading on the proper procedures as far as leakdowns and compression tests go,you're never too safe ! Cheers ! Phil 
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Cheers Phil 89 Coupe,Black,95 3.6 engine and the list goes on ... 1983 944 SP2 race car PCA #96 |
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07-16-2012, 06:56 AM
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Home of the Whopper
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I made my own for a couple of bucks.
It only uses one gauge plus one at the compressor. Similar to this: Automotive Cylinder Leak Down Test - YouTube What do you guys think of this method? I get repeatable results, but are they ~accurate?
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1968 912 coupe 1971 911E Targa rustbucket 1972 914 1.7 1987 924S |
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07-16-2012, 08:36 AM
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porsher
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Summit racing sell a few. Here's the Longacre product.
Longacre Racing Products 73010 - Longacre Engine Leakdown Testers - Overview - SummitRacing.com I have been pleased with other Longacre products.
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86 911 Race Car, with a few 993 bits in the boiler room 79 928 Race Car 88 928 Becoming a Race Car |
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07-16-2012, 08:36 AM
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porsher
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Does anyone have a leakdown test procedure?
I did a quick search but couldn't find anything.
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86 911 Race Car, with a few 993 bits in the boiler room 79 928 Race Car 88 928 Becoming a Race Car |
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07-16-2012, 08:52 AM
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Registered
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just did it this yesterday with a friend. a cool unit with a trigger activation would be cool. the one we used looks like a copy of that longacre one..same yellow knob.
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poof! gone |
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07-16-2012, 10:02 AM
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Registered
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thanks for all the responses. i was thinking i would need a big a$# air compressor!! wasnt looking to spend lots of money for an air compressor.
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07-16-2012, 04:42 PM
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