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Discussion Topic:
Still running rich?
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Flatbob |
04-04-2010 @ 7:55 PM
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Member
Posts: 437
Joined: Oct 2009
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Plugs are still wet & sooty looking; have installed new power valve & idle mixture screws to no avail. Anyone recommend a carb. specialist I could ship to, have heard that someone made a test device that could measure "leak down" on the power valve.
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37RAGTOPMAN |
04-05-2010 @ 6:42 AM
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Senior
Posts: 1965
Joined: Oct 2009
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FLATBOB what year engine and what make carb, was wondering if you looked directly down the carb, when running do you see any gas running down inside the carb,the float level could be to high, also is the float good, not filled with gas,?? I assume the ignition system is good and ignition wires are good, did you rebuild the carb ? fuel pump, how did it run or what did you do different that maybe made this run this way? choke is all the way OFF, are you running a electric fuel pump ? maybe to much pressure, adjust to specs, I think spec should be 3 - 4 lbs, need more info, There a few good carb rebuilders, in the club,[advertise in the V8 TIMES } also parts CELLAR in MASS can help you on this also but you have to be sure what the problem is before you relace many parts, my 3 cents worth 37RAGTOPMAN
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Flatbob |
04-05-2010 @ 7:26 AM
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Member
Posts: 437
Joined: Oct 2009
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Ragtop, will look down carb. throat while running & see if any excess fuel visible. I rebuilt the carb. as far as I could with available rebuild kits, adjusted float level as described in instructions but will recheck. Ignition system gives good spark to all cylinders. Engine idles very smoothly at slightly under 700 rpm, good throttle response in low & midrange, doesn't overheat. Thanks for responding.
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TomO |
04-05-2010 @ 10:33 AM
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Senior
Posts: 7256
Joined: Oct 2009
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Flatbob, do you have the power valve with the machined surface and did you tighten it to 15 ft lbs? The seating surface for the power valve on your carburetor may be corroded or not perpendicular to the threads. It will require a machine shop to correctly reface the seat.
Tom
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Flatbob |
04-05-2010 @ 1:13 PM
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Member
Posts: 437
Joined: Oct 2009
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TomO, Not sure about mating surfaced being machined but will pull it & check. I just installed it screw driver tight, but will go to 15lbs. when I put it back. Thanks, Bob
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TomO |
04-06-2010 @ 8:20 AM
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Senior
Posts: 7256
Joined: Oct 2009
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If you have the power valve with the ribbed sealing surface, I have been able to seal them using a fiber or plastic oil pan drain plug gasket. They are thicker than the kit gaskets.
Tom
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Flatbob |
04-06-2010 @ 9:32 AM
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Member
Posts: 437
Joined: Oct 2009
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TomO, here's a cpl. more symptoms that might help in diagnosing the over rich condition: Engine continues to run although rough with idle screws all the way scr*w*d in, first start of the day will fire right up, restart within 10 minutes with foot slightly on gas pedal carb. instantly floods. Will get the carb. off car today. Thanks, Bob
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supereal |
04-06-2010 @ 10:27 AM
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Senior
Posts: 6819
Joined: Oct 2009
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You need to run a vacuum check. If the idle screws don't affect operation, that is a place to start.
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Flatbob |
04-06-2010 @ 11:11 AM
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Member
Posts: 437
Joined: Oct 2009
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Super, am getting 17" & cylinders very 70-90lbs. This is a new engine with 98 miles on it, am wondering if rings haven't seated yet because it's running rich?
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Flatbob |
04-06-2010 @ 11:15 AM
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Member
Posts: 437
Joined: Oct 2009
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TomO, power valve is .065 with smooth seating surface, should I use two gaskets together instead of one? Don't have a way to measure torque on power valve but will make sure it's in tight.
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