Compression test

[Harrychambers21]

Compression results for a forged engine with 1.2 head gasket?

Edited November 21, 2016 by Harrychambers21

[StuDoc 72]

You tell us your results and we will tell you if they are ok.

We dont know how much has been skimmed off your head regardless of HG thickness.

[Harrychambers21]

Well it's a new engine and I ran up changed the oil and got from number one on. 126 140 138 140

[richardc9052]

140 is ok for a fresh built low comp engine. But cylinder 1 may be an issue.

Why where you doing a compression test? Any reason?

If not it may just be that the rings in that cylinder need a little more time and some load.

[Harrychambers21]

Was just curious really. I no the rings may need a bit of time but the guy said he had an issue with the valve guides so I was wondering maybe that was cylinder one!? Hopefully nothing as it cost a lot!

[fiddlersport]

Leak down test will be better for diagnosing this issue

[triple j]

That could very well be valve guides on cylinder 1, have u any smoke when its first started.

[Harrychambers21]

Did another one tonight just to confirm and with warm engine and throttle open I got 135 150 150 135 so seems to be a bit better. Think once it's all run in should be okay, anyone had dealings with race tech?

[TD04GT]

Usually a difference of 15psi / 1bar between cylinders indicates a problem in that cylinder, your second test shows that in 1 & 4. Do a leak down test on it and see if it changes the results