 Idea on why 1&3 only have 30psi? |
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| Ratt |
 Nov 23 2003, 09:05 PM
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#1
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Member  Group: Members Posts: 85 Joined: 10-September 03 From: Goose Creek, SC Member No.: 1,136  |
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 |
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| Bleyseng |
Nov 23 2003, 09:47 PM
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#2
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Valve adjustment time, as the valves in those cylinders are expanding and staying partially open even when closed.
Geoff |
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| Dave_Darling |
Nov 24 2003, 05:52 PM
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#3
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914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Definitely try that first. But if that doesn't do it... Could be a wiped cam lobe. (IMG:style_emoticons/default/sad.gif)
#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. (IMG:style_emoticons/default/sad.gif) --DD |
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