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914World.com _ 914World Garage _ Idea on why 1&3 only have 30psi?

Posted by: Ratt Nov 23 2003, 09:05 PM

This is puzzling me. when I got the 914, the compression was 120 on all 4 cyl. Now after a few weeks, and screwing up the timing, the 1&3 cyls, only have 30psi and 2&4 have 120psi. If I pour some oil into the low cyl, the compression stays the same, so Im thinking valves, But sense they are on oposing sides, is it possible that the cam is screwed?

I am in the process of dropping the motor, and then when It is out I can tell easier, But what do you all think?
Thanks
Andy Rattley

Posted by: Bleyseng Nov 23 2003, 09:47 PM

Valve adjustment time, as the valves in those cylinders are expanding and staying partially open even when closed.

Geoff

Posted by: Dave_Darling Nov 24 2003, 05:52 PM

Definitely try that first. But if that doesn't do it... Could be a wiped cam lobe.

#1 and #3 share their cam lobes, so when you have low compression on both of those (or #2 and #4), that is one suspect. Check as many other things as you can first, though, as repairing a wiped cam means tearing the entire motor apart.

--DD