vacuum pump whistling

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roadrunner451
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vacuum pump whistling

#1 Post by roadrunner451 » Wed Jun 13, 2012 6:10 pm

3 vane moroso pump is whistling when i let up off the gas under hard acceleration ,, vacuum gauge is at 12 hg which is plumbed into the valve cover, this pump is 2 summers old .ty
mike , 1970 road runner 451 cu in indy 440-1 cyl heads, solid roller cam,T&D rockers 11.12 at 120 mph on motor.

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John_Heard
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Re: vacuum pump whistling

#2 Post by John_Heard » Sat Jun 16, 2012 7:45 am

Seems that would be hard to confirm where the whistle is coming from? And when you say it's doing it under deceleration that makes it sound a lot more like intake leak..

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