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RPM resonance. Front hood, dash?

gvr4ever

Well-known member
Joined
Aug 6, 2002
Messages
6,195
Location
central Indiana
To get rid of a specific RPM drone, you're better off adding a Helmholtz resonator than a straight resonator

I am aware of the Helmholtz resonator. The issue would be cost of a stainless steel custom piece. I'd be worried about weld stress over time without an exhaust mount holding up the other end over time. The issue I have is the hood resonates at around 2200 RPMS, but I can hear the exhaust resonate slightly above that and then go away. So it isn't exactly just one frequency. It's my understanding that a pass through resonator should take care of the same issue. Thank you for the response. I'm sure it would work, it would just make the cost way more complicated. If I just had a steel exhaust, then it might be a different story.

I did hear back from my mechanic and he had hurt his back. I'll probably just wait a little and let him do the work. He won't charge $150 an hour.
 

JNR

Well-known member
Joined
Apr 23, 2004
Messages
9,814
Location
ca
How are your hood hinges? Mostly the pivot pin...They can get sloppy over time and wondering if it's amplifying the resonance in that area.
 

gvr4ever

Well-known member
Joined
Aug 6, 2002
Messages
6,195
Location
central Indiana
How are your hood hinges? Mostly the pivot pin...They can get sloppy over time and wondering if it's amplifying the resonance in that area.
I did replace the driver side. Now mismatched green. 😱 Both are solid now.
 
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