Author Topic: Vacuum Noise  (Read 258 times)

jdv69z

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Vacuum Noise
« on: September 05, 2017, 07:09:57 PM »
302 in my Z runs great, but I am hearing a high pitched whistle while it runs. It is coming from the carburetor inlet; when I place my hand over the air horn, it disappears. Is this normal, or does someone have an idea what could be the cause? I have a brief video but it's 18.3 MB.
Jimmy V.

L78 steve

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Re: Vacuum Noise
« Reply #1 on: September 07, 2017, 03:36:16 PM »
If its coming from inside the venturi area it OK. The engine is pulling air and fuel through the carb circuits.
69 Z/28 Dover White. SOLD
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Z10Mike

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Re: Vacuum Noise
« Reply #2 on: September 07, 2017, 07:59:50 PM »
The Holley on my big block does the same thing.  More noticeable since I pulled off the cowl hood flap for full time cool air, providing a noise path.