86GT 93LX

doing comp test right now im pulling 140 or so on the number one, letting it sit right now to keep an eye on leak down. ran it twice 140 each time so far

monkeydude3

that sounds pretty good for that cylinder. How many miles?

Have you checked the other seven cylinders? You will want to check all eight twice. Take each set of numbers, add them together, divide by two. You take the average of each cylinder, write them down in a manner they are arranged like the cylinders are in the engine. You will get a very good idea of where if any problems are. Also try a complete "dry" test of the engine, then use a little oil in each cylinder and see if the numbers change at all.

86GT 93LX

ok its actually number 5
5= 140 psi
6= 148 psi
7= 136 psi
tested twice dry, will report the rest as soon as i get done

monkeydude3

so far those numbers look okay. like I said, get them all, average a couple tests, and lay them out in a picture as the engine sits. You don't want too much difference between the highest and the lowest readings. I believe an overall standard is you dont' want more than 10 psi difference between the highest reading and lowest reading.

86GT 93LX

i have 227k on my motor

monkeydude3

testing them all "dry" and then repeating the procedure with a few squirts of oil in each cylinder will tell you if you have leaking piston rings.

86GT 93LX

8=140psi
but number 7 dropped about 5psi in 10 mins
[:@][:@][:@][:@][:@][:@][:@][:@]

86GT 93LX

yep 30w oil or 10w30 will work right?

monkeydude3

yeah either will do. Just make sure it is engine oil! :-)

If your numbers change only a little or not at all by adding the oil, then you probably have a good bottom end and it may just be a head rebuild/replacement that you need. You'd be surprised how much leaks by worn valves and such.

Anway, I have school tomorrow, so I'm out for now. PM me anytime I'd be glad to talk tech stuff with ya!

86GT 93LX

thanks bro, i can use all the help i can get