Carrera Compression Testing Numbers

[Brando]

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]

I have a portable compressor....

[geshaghi]

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]

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

Originally Posted by Joe Bob

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.

Originally Posted by geshaghi

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]

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]

Originally Posted by DRACO A5OG

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]

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]

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]

, like my LM2 sitting on the shelf

[Joe Bob]

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

[al lkosmal]

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]

Want to visit us SoCali? Beer on JB

[Joe Bob]

Pelican Parts.com - Cylinder Leak-Down Tester

Looks like Our Host has a kit as well.

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