22-06-2018, 08:00 PM
Well, I tried the finger over the plug hole compression check but I'm not sure I can tell if it's OK or not. There certainly seems to be some compression (actually the suction on the inlet stroke is more noticeable) but I don't think it can equate to the 100 psi or so I have read would be correct.
The valves aren't sticking and although the tappets gaps were possibly slightly small I don't think it was enough to cause any issue.
I tried running the engine with the plug from the cylinder which isn't firing laying on the head. There seems to be a good spark and the engine actually ran better with the plug out! Presumably this is because the engine isn't doing any pumping on the missing cylinder.
So, do I bite the bullet and remove the head or buy a cheap compression tester first? It's an Ulster replica so to lift the valves I would probably have to remove the manifolds before I could get a valve lifter in position.
John.
The valves aren't sticking and although the tappets gaps were possibly slightly small I don't think it was enough to cause any issue.
I tried running the engine with the plug from the cylinder which isn't firing laying on the head. There seems to be a good spark and the engine actually ran better with the plug out! Presumably this is because the engine isn't doing any pumping on the missing cylinder.
So, do I bite the bullet and remove the head or buy a cheap compression tester first? It's an Ulster replica so to lift the valves I would probably have to remove the manifolds before I could get a valve lifter in position.
John.