CRG Discussion Forum

Camaro Research Group Discussion => Maintenance => Topic started by: jdv69z on September 05, 2017, 07:09:57 PM

Title: Vacuum Noise
Post by: jdv69z 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.
Title: Re: Vacuum Noise
Post by: L78 steve 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.
Title: Re: Vacuum Noise
Post by: Z10Mike 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.