Compression Test Results from PPI- Advice Please!
 

Hello,

I just has a compression test run on a car that I am looking to buy, a 1988 911 with about 59k miles on it. The test compression came back with these numbers:
Cylinder #1 160 psi
#2 165
#3 165
#4 170
#5 165
#6 170

The guy told me that anything between 130 and 180 was very good.

I have not done this before so I am not sure if this is true or what it "really" means.

Any help is appreciated!

You want to get more info than this, more meaningful is a leakdown test. Ask for one.

Your mech. is right

Didn't I already respond to this? What happeded to the all the posts? Did you delete this or edit it and then post again?

Strange...

-Wayne

Fish,
Glad you posted this question. Been meaning to ask about PPI results from my 911 purchase:
#1 - 165 psi
#2 - 155
#3 - 165
#4 - 165
#5 - 165
#6 - 170
Back then, the mechanic said compression-wise things looked "okay".

160 in one and 145 in the other isn't necessarily bad, per se'. It's about 10% less, which is common with an engine that is getting older.

TedSlick, your numbers look okay too...

-Wayne

I did a test on my sisters 88' Nissan Stanza. She was woried about the condition of the motor since the car has 220k on the odometer. All four cylinders were within a half pound of each other and four pounds below "new" spec. I told her that that motor is going to outlive us before it needs a rebuild. Truth is that motor is never going to need a rebuild because it's going to end up in a junkyard because no one wants it anymore not because it wore out.

Bobby

thats a riveting story boboloo

Forgot to ask the obvious follow-up question:

"Okay" PPI compression readings tells what about the engine?