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

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

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

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

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

http://forums.pelicanparts.com/uploa...1342446889.jpg

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?

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.

Does anyone have a leakdown test procedure?

I did a quick search but couldn't find anything.

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.

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.