Thread: Acceptable engine compression? 86" 2.0l

The 100 is perhaps a little low compared to the others (leaky valve?), and I would have expected pressures about 5-10 higher, but they are not too bad. Have you checked valve clearances?

I checked the tappet clearances today. Inlets were all good and not changed. Exhausts were a little big and were nipped up a little bit each.

My main issue is a persistent miss at idle. I suspect the mixture is all out as it seems way too rich. It blows black smoke on acceleration. I took the compression readings as I suspected a valve or head gasket issue causing the miss??

You could try a new set of spark plugs, if it is running rich & one of the pluge is week could be causing the miss. Also has it got copper or carbon leads if carbon you could have a faulty lead. Also check the points gap on all 4 lobes if one is worn that could also give a miss

Yes it seems to eat plugs for breakfast. I have gone to one step hotter which has helped plug life a bit.

The leads are new copper leads with new dizzy cap.

If you needed to go to hotter plugs, I would suspect the rings are not in real good condition, which fits with the somewhat low compression (been there!). But this should not directly cause rough idling - worn engines often idle very smoothly. Other points to suspect are all the other ignition components, including coil, points and capacitor. But rich running at idle has to be a carburettor issue.

What carb is on it?
Paul

Originally Posted by Bundy

What carb is on it?
Paul

Solex 32PB-2.
I've put a gasket and diaphram kit through it. Also sleeved the spindle which had some free play. No jets appeared blocked.