kakapoopie Posted June 29, 2009 Share Posted June 29, 2009 Went to go see an early 71 240z today, did a compression test and got 1 179 2 168 3 163 4 170 5 167 Exhaust(?) valve was stuck open for the first couple tries (0 pressure). Took off the valve cover and popped the spring back on right and got the 167 reading 6 200 why so high?? The engine is a L28 N42 block and early E88 head with SU carbs, been sitting for 2 years and I had to test it cold because the car doesn't run (no fuel) ps. How do I fix the valve stickiness? Quote Link to comment Share on other sites More sharing options...
Xnke Posted June 29, 2009 Share Posted June 29, 2009 Looks like it has good compression, if just a tad uneven. I'd say get it running and you'd have a good strong motor for premium fuel, if the other numbers come up to the 200 range, if #6 falls to the 160-179 range, then mid-grade should do. Seems to have good rings and slightly sticky valves from not running for a while. I'd go ahead and change the oil, fix the fueling issue, and run it. If the valve sticking goes away, they were just sticky, if not, then you'll need to check the head out closer. Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted June 29, 2009 Author Share Posted June 29, 2009 Thanks Xnke, I'm hoping #6 falls back down (student budget doesn't like premium!) but good to hear this isn't cause for too much concern. Quote Link to comment Share on other sites More sharing options...
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