What temp to check compression?

[bretto]

Do you check it when the engine is at full operating temp or cold. Does comression normally go up when after the engine is warm or visa-versa?
Thanks,
Brett

 

[baxtr]

Re: What temp to check compression?

you can check it cold, as your motor gets warmer, the rings do expand,that is why there is a gap in the ring, so they don't expand and get too tight in the cylinder.

 

[roscoe]

Re: What temp to check compression?

Warm is more consistent.
Do it cold if you can't warm it up.
Readings tend to be higher when the engine is warm.

 

[bretto]

Re: What temp to check compression?

So I checked the compression last night cold and got all 3 at 115 or so #'s. So is it safe to assume that the compression will be more so when at full running temp? Are those good #'s? This is on a '83 Force 85 by the way. Also I sorta goofed and didnt ground out the plug wires when I did it, do you think I damaged the coils at all?
Thanks all,
Brett

 

[roscoe]

Re: What temp to check compression?

Compression is fine.
Damage? don't know.