 100 - 115 - 110 - 110 Compression, In order 1234 for 1.8L |
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| qa1142 |
 Nov 12 2004, 04:41 PM
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#1
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Whiplash  Group: Members Posts: 1,514 Joined: 1-June 04 From: Lake Zurich, Illinois Member No.: 2,140  |
Ok
likely not hot enough, ran it for 15-20 min. checked compression. Plugs are in the picture Left to right 1, 2, 3, 4 also. The 1974 had the lowest compression (right?). So is this low? Thanks gang Attached image(s) 
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| Root_Werks |
Nov 12 2004, 04:45 PM
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#2
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Village Idiot Group: Members Posts: 8,338 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest 
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A little, just think, you could run on 50 octane gas if you wanted! (IMG:style_emoticons/default/rolleyes.gif)
Wouldn't worry about it, still have lotso good miles left in the 1.8. |
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| scruz914 |
Nov 12 2004, 05:02 PM
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#3
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Senior Member Group: Members Posts: 815 Joined: 26-February 04 From: Santa Cruz, CA Member No.: 1,724 |
Doesn't sound too bad to me. Except for #1, the plugs look good (maybe a little light). The lower compression in 1 probably explains the darker plug. Main question is, how does it run? Are you burning oil? You don't want to let #1 get any lower. If you squirt a little oil in 1 does the coompression come up? That would spot the lower compression to rings or valves.
-Jeff |
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| qa1142 |
Nov 12 2004, 05:07 PM
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#4
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Whiplash Group: Members Posts: 1,514 Joined: 1-June 04 From: Lake Zurich, Illinois Member No.: 2,140 |
Burns no oil. i am planning on NOT rebuilding this winter.
Focus is other stuff. I'll check leak down after i pull the engine. |
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| scruz914 |
Nov 12 2004, 05:12 PM
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#5
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Senior Member Group: Members Posts: 815 Joined: 26-February 04 From: Santa Cruz, CA Member No.: 1,724 |
If it not your rings it could be a problem with your valves. When was the last adjustment? A valve may be a bit too tight and not completely closing. Much worse would be a chipped valve. I would check the valve adjustment and also retest with a little oil in the cylinder.
-Jeff |
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| anthony |
Nov 12 2004, 05:23 PM
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#6
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2270 club Group: Benefactors Posts: 3,107 Joined: 1-February 03 From: SF Bay Area, CA Member No.: 218  |
QUOTE I'll check leak down after i pull the engine Don't worry about it. Leakdown is a diagnostic tool for finding where the leak is (exhaust, intake, rings, etc) in a leaky cylinder. I'd just adjust the valves when you get it back on the road and then redo the compression check with a fully warmed up engine. |
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| TheCabinetmaker |
Nov 12 2004, 05:56 PM
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#7
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I drive my car everyday Group: Members Posts: 8,304 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Two words. Valve adjustment. Like the others have said, misadjusted valves will wreak havok on your engine performance, proper idle, starting, gas mileage, etc. And the most feared of them all, a dropped valve seat. Carnage beyond description!!!!
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