Stock Internals on a D16Z6, I did every cylinder a few times to get out the odd readings.

Cylinder #1: 181psi.
Cylinder #2: 180psi.
Cylinder #3: 187psi.
Cylinder #4: 189psi.

Pretty good for an engine with 129,xxx miles.

 

very good numbers.

Question:

will my compression readings go down with altitude?

 

Yes, the higher you are, the lower the psi. If you were ever to get a turbo, you may have to run 8psi to be equal to 6psi, you know what I mean.

 

Good numbers. Just keep the oil changed, and don't go over the timing belt maintenance schedule, then I'd say it would run forever.

 

The timing may be retarded by a tooth or two because I can hear some valvetrain noise that shouldn't be there. I'll take the cover off and look at it tommorow.

 

i wonder how much of a difference it makes.... too bad i dont have a compression tester here at 300 feet to compare to my 6500 foot reading.

 

You probably have loose valves if you're hearing valve train noise. You probably just need a valve adjustment. A slipped timing belt is a pretty big deal, and it should either always run like shit or not run at all if that happened. You shouldn't drive it at all until it's fixed if you did jump time. It could jump again and hose your motor.

Check your timing marks, but I bet you find the problem under your valve cover. Loose valves will rattle, but they'll still stay tightly closed because of the valve springs. Comprendé?

 

jafro-- see my new thread about Timing... I'd like your help on understanding something.

 

it actually makes quite a big difference. My friend's car makes a good 20-25 butt-dyno hp in michigan as compared to boulder.

 

20-25 butt dyno? so what, 3 hp real dyno?