Oil is going somewhere... not leaking.

[driftingmustang]

leak down test

 

[Slykin]

Alright, thanks again

 

[driftingmustang]

it can also till you if you have shitty valves. so.....yeah. either way, rebuild time.

 

[toyman]

Yeah, I figured it might not, but it's worth a shot anyways. Any other ways to tell if the rings are shot other than smoke/compression that you know of?

Compression and leak down test are two different tests. A compression test tell you what the cylinder pressure builds to and gives you a value that shouldn't vary more than 10% across all cylinders. A leak down test is when you add compressed air to the cylinder (both valves closed) to see if the rings or valves are sealing properly by holding the pressure.

 

[driftingmustang]

if both pass you can be pretty sure the problem is elsewhere, like a valve guide.

 

[Slykin]

What should the compression test #'s be at with the fuel not turned off?

 

[driftingmustang]

.....uh, you should turn the fuel off. then you should check a chiltons, haynes or other wise find factory spec for this. typicalythat is somewhere between 140 and 170 but thats a pretty broad range, so again, find the specs.