I have a 3.8 mk2 and did a compression test this week and wondered if anyone had any comments regarding the results. I thought they were pretty good, but don’t know what they should be. I think it is an 8 to 1 compression engine, standard head and cams. The inlet valve clearances are all a bit tight.
Both tests were done with a good battery, all plugs out and throttles wide open. Engine cold and compressions were in the range 140 to 145. When hot compression ranged from 150 to 155.
All within 5% so I am pleased, but are they good, bad or indifferent?
Also would the tight inlet valve clearances (all about 1 thou) make much difference?