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-   -   Is this good? (http://forums.mustangworks.com/showthread.php?t=17342)

Five0 12-13-2001 07:07 PM

Is this good?
 
I ran a compression test and these are the #'s I got.
1. 150
2. 155
3. 155
4. 155
5. 160
6. 155
7. 160
8. 160

Is that good or bad; the motor has about 3000 miles on it.
I have a 347 with 10 to 1 compression.

I think it is pretty good but want a second opinion.

lx mike 12-13-2001 08:03 PM

it is very good. what your looking for is any cylinder that is much lower than the others.

Five0 12-14-2001 08:40 AM

That is what I thought, thanks mike.:)

exgmguy 12-14-2001 01:59 PM

Consistency is good, but my stock compression motor makes 155-160 across the board. A friends LT1 shows 180 psi and they are 10.25 to 1.

Maybe you might want to try a leakdown?

exgmguy 12-14-2001 02:02 PM

I think the overlap of any given cam may also affect compression numbers, so being you have a 347, it probably has a decent cam and you probably don't have anything to worry about.

Did you check the compression when the engine was at operating temperature? A warm engine is usualy good for another 10 psi or more.

Five0 12-14-2001 06:37 PM

It was warm but not hot.
The cam is a 224/230@0.050 with .544lift 112ls

I do not know anyone around here that has a leak down tester.


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