 *^&)(^&$&^&*, Low Compression #4 Cylinder |
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| Carlitos Way |
 Feb 8 2007, 08:16 PM
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#1
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I did it MY WAY  Group: Members Posts: 1,337 Joined: 14-September 04 From: Simi Valley, CA Member No.: 2,757 Region Association: Southern California  |
Well, no wonder I can't get my damned webers to sync! My #4 Cylinder only has 70 lbs compression. Any thoughts/suggestions? (No, BJ, a Scooby is not an option at this time)
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| Crazyhippy |
Feb 8 2007, 08:31 PM
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#2
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Insert witty comment here... Group: Members Posts: 1,659 Joined: 28-July 05 From: Home of the Coyotes, AZ Member No.: 4,493 Region Association: None |
damn... on multiple levels
BJH |
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| Crazyhippy |
Feb 8 2007, 08:35 PM
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#3
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Insert witty comment here... Group: Members Posts: 1,659 Joined: 28-July 05 From: Home of the Coyotes, AZ Member No.: 4,493 Region Association: None |
What are the other #'s?
And try squirting just a bit of oil in #4 and see what it does to the compression #'s |
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| Joe Bob |
Feb 8 2007, 08:35 PM
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#4
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
Well...ya gots to figure out why....
Toss in some oil and redo....comp up? Rings.... Same old shit.....valves.... |
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| Carlitos Way |
Feb 8 2007, 08:51 PM
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#5
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I did it MY WAY Group: Members Posts: 1,337 Joined: 14-September 04 From: Simi Valley, CA Member No.: 2,757 Region Association: Southern California |
OK. A little more info: I re-did the compression test, this time with the throttle open. *(yes, dumbass)*. Now, it's interesting. All cylinders are about even at 120 with open throttle. But, with closed throttle #3 is about 20 lbs lower than 1, 2 and 3.
So... any other ideas? besides a shotgun? |
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| Joe Bob |
Feb 8 2007, 09:02 PM
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#6
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
Do a leak down....kill a chicken....sacrifice a virgin...
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| sean_v8_914 |
Feb 8 2007, 09:07 PM
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#7
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
hold revs at 3800 rpm. slowly sprinkle 1/2 cup of AJAX into throttle body. change oil. say 10 Hail Marys.
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| SGB |
Feb 8 2007, 09:50 PM
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#8
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just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
Blocked air passage in the carb? Are the air bypass screws choked down all the way? I gotta have a couple of turns out on mine. I might attribute the inconsistant test results to that too, or maybe battery condition. A few rpms slower can REALLY scew results- I speak from experience- my panic was leading me to some dramatic conclusions. 120 all around is good. If you repeat the test you may get different results, then what happens to your confidence? If you decide to rebuild the webers, make sure you set the float level- that being off caused me a long period of angst as well.
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| Crazyhippy |
Feb 9 2007, 10:45 AM
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#9
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Insert witty comment here... Group: Members Posts: 1,659 Joined: 28-July 05 From: Home of the Coyotes, AZ Member No.: 4,493 Region Association: None |
Whew...
if they are all even w/ the throttle blades open, the rings and valves are ok. The difference when the throttle is closed could be carb tweakage, something plugged, etc. BJH |
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