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Old 11-01-2010, 08:57 PM   #1
Scooby Newbie
Member#: 251848
Join Date: Jul 2010
Default Compression Tester - Extension fange

I bought this kit at autozone and tried to do a compression test on my 03' wrx and it was almost a catastrophic failure. The flange got stuck what I think to be in between the value covers/head walls. I didn't even get how I got it in because I manged to do a compression test of 130 in the chamber closest to the driver side firewall. When I went to use my 13mm socket I couldn't get a bite on the flange bolt head for the life of me, the only thing I could do to get it out was a bolt extractor kit.

I need some recommendations on were to get a longer flange i've looked everywhere autozone doesn't carry it and on amazon they appeared to be the same size. I'd say needs to be roughly twice as long.

1 7/8" Flange

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Old 11-01-2010, 09:22 PM   #2
Scooby Specialist
Member#: 236927
Join Date: Jan 2010
Chapter/Region: NESIC
Location: Oakville CT
2015 BRZ 93 LEGacy33
1984 BRAT


Don't even use the adaptor, it will only get stuck. I tried to use the adaptor, luckily I did not screw it in all the way, but my 5/8 spark plug socket was too thick, it wouldn't get in between the spark plug wall and the adaptor, so I just had to twist it out with my finger. (Much blood and a scratched up finger, I was burning red out of the exhaust when I started it up )

I just screwed the hose in until it seemed tight enough and cranked my engine over a few times and did it on each cylinder. My readings came out accurately, I had between 140 - 150 on each cylinder.

Some people say that some of the compression might escape through the little rubber rings, but from my experience, it is fine to just use the hose without the adaptor. And... if it doesn't work, then you don't have a stuck adapter in the spark plug hole.. that thing is a PITA to get out.

Just try it with the hose and see what happens. Like I said I got accurate results that way. Using the adapter, you are just looking for trouble.
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Old 11-02-2010, 02:48 AM   #3
Scooby Specialist
Member#: 134272
Join Date: Dec 2006
Chapter/Region: HIIC
Location: Kahaluu, Hawaii
2007 Sti, UGM
Rotated EFR 6758


I took an extra spark plug socket and ground it down to fit. Think thin wall socket, like really thin ones. Then its no problem getting the adapter out.
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Old 11-02-2010, 02:52 AM   #4
bue car
Scooby Guru
Member#: 176134
Join Date: Mar 2008
Chapter/Region: SCIC
Location: Torrance, CA
1995 Coupe, Sedan &
Wagon ;)


mine fit in my rs no problem. there is a 6 inch extension you can buy from the same company that you screw in the block, and then the hose onto that!
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Old 11-02-2010, 10:39 AM   #5
Scooby Newbie
Member#: 232012
Join Date: Dec 2009

i just twisted the hose around till it felt tight, crank the motor... check results.. all my cylinders came to 152 and i just let it sit and it help pressure for 5 mins... so i knew it was escaping
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