correct way to do compression test

[funcrew]

I have an old compression tester from back the early '80s. We used to just pull the coil wire & crank the engine to test each cylinder.

What is the correct procedure to measure the compression on an S50?

[SpecM]

I have an old compression tester from back the early '80s. We used to just pull the coil wire & crank the engine to test each cylinder.

What is the correct procedure to measure the compression on an S50?

unhook the DME

[funcrew]

unhook the DME

OK, good; no fuel spewing out the spark plug holes.

What I mean is, will the comp numbers be legitimate if taken cranking the starter motor? Or turning the crank with a socket wrench? I'm trying to figure out how bad my HG is blown.

[416stroker]

Use the starter youll never get to turn over fast enough to build pressure by hand.

Edit: One rotaion of the engine usualy isnt enough crank it for two or three.:D

[gobuffs]

absolute numbers are basically irrelevant, shat is important is that the numbers vary by less than 10% across all cylinders.

[evil_twin]

Make sure you hook up a jump pack or battery charger so you get the same consistency also.

[SpecM]

how bad my HG is blown.

how bad? kinda doesn't matter, you have to take it apart anyway...

[funcrew]

how bad? kinda doesn't matter, you have to take it apart anyway...

...Gives me one more thing to procrastinate with. The HG problem is totally creeping me out, and I'm trying to stay in deep, deep denial for a little while longer 'till I can man up and do something about it.