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-   -   Carrera Compression Testing Numbers (http://forums.pelicanparts.com/porsche-911-technical-forum/676094-carrera-compression-testing-numbers.html)

Brando 05-05-2012 09:12 PM

Carrera Compression Testing Numbers
 
As some of you may have seen, my 1987 Carrera 3.2 is for sale. Today I did the compression test and the numbers are as follows:

Cylinder 1: 176 psi
Cylinder 2: 175 psi
Cylinder 3: 176 psi
Cylinder 4: 174 psi
Cylinder 5: 172 psi
Cylinder 6: 175 psi

For a stock USA engine with 220k, these are pretty good, yes? I did the test with the engine warm, WOT and no other spark plugs removed.

I want to do a leak-down test, but I do not have any contacts local with an air compressor and the tool.

Joe Bob 05-05-2012 09:14 PM

I have a portable compressor....

geshaghi 05-05-2012 10:03 PM

Those numbers seems excellent to me, and a remarkable improvement over what you initially posted. Curious what accounted for the difference between the first test and the second test?

Brando 05-06-2012 08:02 AM

I take that back, I know one local. Joe, do you have the leakdwon tester as well?

Quote:

Originally Posted by Joe Bob (Post 6730993)
I have a portable compressor....

The initial test I left the throttle closed. The second time I had an assistant to keep the driver's seat warm, turn the key to crank the engine and also hold the throttle down.
Quote:

Originally Posted by geshaghi (Post 6731034)
Those numbers seems excellent to me, and a remarkable improvement over what you initially posted. Curious what accounted for the difference between the first test and the second test?


DRACO A5OG 05-06-2012 08:15 AM

Yeah JB you got the leak down tester? I may need a hand toooooooooooooooo.

Please correct me if I wrong but don't we want to disconnect the fuel (in my case disconnect the dme relay) to do compression test so fuel is not added to the compression readings??? We want it to crank not ignite, right?

Brando 05-06-2012 08:19 AM

Quote:

Originally Posted by DRACO A5OG (Post 6731464)
Yeah JB you got the leak down tester? I may need a hand toooooooooooooooo.

Please correct me if I wrong but don't we want to disconnect the fuel (in my case disconnect the dme relay) to do compression test so fuel is not added to the compression readings??? We want it to crank not ignite, right?

Correct - pull the DME relay! Stops both spark & fuel.

DRACO A5OG 05-06-2012 08:23 AM

Hewh! I thought I did it wrong all this time, Thanks Brother!

BTW, your numbers look great, within 10% of each other is ideal from what was told to me by the experts.

Joe Bob 05-06-2012 08:25 AM

I have a compression checking device and portable Makita compressor.....no leak down equipment.

I don't think they are real expensive. I'm sure HF has a cheap China made one. Summit has them for 70 bucks and up.....Autozone as well. Split it with Brando, sell it when done.

I've never had need of one, so not part of my collection.

DRACO A5OG 05-06-2012 08:33 AM

:D, like my LM2 sitting on the shelf :(

Joe Bob 05-06-2012 08:34 AM

The guy with the most tools.....has the most tools....

al lkosmal 05-06-2012 08:39 AM

I would recommend buying you leak down tester from Aircraft Spruce. Much better quality than the HF version....for just a few additional $.

http://www.aircraftspruce.com/catalog/topages/cylpresse2a.php

regards,
al

PS: I have both...............

DRACO A5OG 05-06-2012 08:43 AM

Want to visit us SoCali? :D Beer on JB :eek:

Joe Bob 05-06-2012 08:49 AM

Pelican Parts.com - Cylinder Leak-Down Tester

Looks like Our Host has a kit as well.

Jim, thanks for volunteering me for beer beeyotch....


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