Steve, I just replaced my Holley 4160 with an original-style 3810 and it reduced the noise level of my side pipes by an amazing amount. I have no idea why that would be but the difference is amazing.
I just backed my car out into the driveway and took a decibel reading of 72.7 at idle after a cold start. Reading taken from the driver's seat.
60 dB is the level of normal conversation. 80 dB is the level of a ringing telephone. Previously, with the 4160 carburetor, I'd get a reading of 112 dB which is a little more than the typical noise level of a chain saw.
I'll take a longer reading while underway the next time I take the car out.
Take care,
Steve
|