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06-11-2011, 10:54 AM
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CC Member
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Join Date: Apr 2008
Location: Mechanicsburg,
PA
Cobra Make, Engine: Everett-Morrison, 429CI
Posts: 98
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Not Ranked
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
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06-11-2011, 12:08 PM
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CC Member
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Join Date: Aug 2010
Cobra Make, Engine: RUCC, SB 331 Stroker
Posts: 171
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Not Ranked
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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06-11-2011, 12:09 PM
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CC Member
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Join Date: Nov 2000
Location: Flower Mound, TX,
tx
Cobra Make, Engine: Lonestar LS 427, Keith Craft 501,Toploader
Posts: 883
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Not Ranked
Never heard of that before, I'd double check with an engine scope.
__________________
" It ain't no big deal" 
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06-11-2011, 12:24 PM
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CC Member
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Join Date: Jul 2005
Location: Bartlett,
Ill
Cobra Make, Engine: Everett-Morrison LS1
Posts: 2,448
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Not Ranked
Worn throttle shaft in base plate----vacume /air leak there---same sound from both sides of carb??
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06-11-2011, 12:57 PM
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CC Member
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Join Date: Jul 2009
Location: Westerly,
RI
Cobra Make, Engine: Fordstroker 408w custom solid roller-Craft ported Brodix 17*heads-CFM ported Vic Jr. intake-1 3/4 primaries- 575hp-TKO-600RR Liberty upgrade- -Moser 8.8 trutrac-McLeod Street Extreme--QA-1-Wilwood brakes, Classic Chambered 3" Cobrapacks, Avon's
Posts: 645
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Not Ranked
Agreed, [vacuum leak] squirt some wd40 in the areas described above and it should change the sound or stop it for a short time.
__________________
Lou
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06-11-2011, 01:10 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
Quote:
Originally Posted by Chaplain
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
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do you have the factory manifold and carb on your 429?
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
__________________
Fred B
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06-11-2011, 06:12 PM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,533
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Not Ranked
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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08-04-2012, 08:48 PM
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CC Member
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Join Date: Mar 2003
Location: PVE,
CA
Cobra Make, Engine: ERA 289 FIA #2027, 65' 289" PS wheels
Posts: 345
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Not Ranked
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
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ERA 289 #2027
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08-04-2012, 09:45 PM
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CC Member
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Join Date: Sep 2009
Location: Camarillo,
CA
Cobra Make, Engine: SPF #2608, Roush 427SR T-W
Posts: 911
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Not Ranked
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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08-05-2012, 02:31 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
I've seen some carbs with a squealing noise from airflow going past the butterflies at idle.
__________________
Gary
Gold Certified Holden Technician
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