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Carb Noise
The carb I'm using is a Holley. When i rev the engine the carb makes a screaching noise. It sounds exactly like a belt slipping but I've checked thouroughly and it is definetly the carb. Any thoughts on what it might be?
Thanks Chaplain |
Perhaps a vacuum leak at the base gasket. Torque the mounting bolts/nuts to 80 to 100 inch pounds using a criss-cross pattern and see if it helps.
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Never heard of that before, I'd double check with an engine scope.
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Worn throttle shaft in base plate----vacume /air leak there---same sound from both sides of carb??
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Agreed, [vacuum leak] squirt some wd40 in the areas described above and it should change the sound or stop it for a short time.
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Quote:
is there an EGR valve behind the carb? if so it may have crapped the bed and causing the screeching sound. which is a vacuum leak..... fred |
I've had an Edelbrock carb make a whistling sound because I used a base plate gasket with a single passage for the bores. Switched to a 4-hole gasket (4-hole intake) and it stopped. Slim chance this is your problem but something to check.
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whistling/shrieking Holley
On my 67' Corvette, the Holley 1850, after about 10 years, would scream so loud you could hear it on the freeway.
Eventually I took the carb apart and used 220 wet/dry paper to sand the flats on the main body...metering block...float bowls...any surface that was supposed to be flat... Used a milled steel saw table as the base when possible, moved the piece in figure 8's over the sand paper with a little water. The carb was quiet for several months...eventually the noise returned, but for a while it was quiet and didn't weep gas from every joint. So, a vacuum leak, why ?..... something is not sealing...you may be able to sand it flat or have it milled....or if the old pot-metal castings are disintegrating....give it up and get newer parts. Not your imagination, they can make horrendous noise. Pete |
Mine squeals occasionally like a slipping belt when it is cold and I assumed it was the belt. Doesn't do it when it is warmed up. Since I don't have a choke I have to keep my foot on the gas to keep it running. You think it is a vacuum leak? Engine does not perform like it has a vacuum leak.
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I've seen some carbs with a squealing noise from airflow going past the butterflies at idle.
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