Stock 760 compression?

[NVJAY775]

My elevation is 4500' and my compression is 112psi. That sounds low to me, but I don't know. I want more, but need to learn how to get it right. And I would like to stick with pump gas.

Any suggestions?

 

[tor*p*do]

should be around 150
I believe the 760 rear cyl is supposed to be about 5 psi lower than the front
112 is either a bad gauge (check calibration) or a weak top end
bumping compression say with a a/m head on a weak top end
will accelerate engine failure

 

[NVJAY775]

should be around 150
I believe the 760 rear cyl is supposed to be about 5 psi lower than the front
112 is either a bad gauge (check calibration) or a weak top end
bumping compression say with a a/m head on a weak top end
will accelerate engine failure

The rear cylender is 2 psi lower than the front. The front is at 114 and the rear is at 112. My buddies tester is reading the same as mine. It has an a/m head from Pro-Tec on it. It's more of a mid grade head I think. I saw it on their site.

I'm thinking of running it the rest of this season and save for some upgrading this winter. Any recomendations?

 

[tor*p*do]

If it starts and idles easily and runs good, run her until she blows!
If not looking like a new top end in your future

 

[Waternut]

If you're at 4500 ft in altitude you will see a lower tested compression than at sea level. I'd figure between 80-90% of normal compression so if it's supposed to read 150 with a (stock head) you should be around 120-135 psi. No idea what that head is doing to you though.

As said before, if it runs and you're happy with it right now...Run it until you're ready to rebuild it or look into it further. The plus side is both cylinders are even so it's either equal wear or not really an issue.

 

[NVJAY775]

Sweet! Thanks guys.