cbernhardt said:OK, since the topic here is exhaust systems, I have a question for the any of the exhaust experts. I have a ’59 Corvette with a 572/620 crate motor. I could not find any ‘D’ port headers, much less ones that would fit in this car, so I built a set of equal length (32”) 2” diameter primary headers that dump into a 3” exhaust. The mufflers that I currently have are perforated tube type and offer very little in the way of noise reduction. I would like to have something quieter, but none of the commercial “box” type chambered mufflers that I have found will fit in the limited space. The current mufflers are 4” in diameter, but I could probably fit something like a 5” x 7” oval shape in the available space. Anyone have a suggestion on what type of muffler I could buy (or build) to make this beast quieter?
first congratulations on what looks like a very nice custom built car frame, for what is obviously a car you put a good deal of time and effort into building.
your limited room is obviously a problem, distance and volume to expand and cool the exhaust helps dissipate its strength, you might want to measure very carefully to find exactly what the largest muffler size could be , because in this case size and distance do mater
the NOISE you hear is the result of repetitive high pressure pulsed exhaust,as the cylinders, release high pressure exhaust gases into a confined space the headers and tail pipes, you MUFFLE the sound by destroying the individual PULSE STRENGTH, and velocity and spreading out the exhaust pressure to an even flow as it exits,
installing an (X) pipe will effectively blend alternate pulses, there are (X) PIPE DESIGN MUFFLERS
allowing the pulse to expand and loose energy in a muffler after an (x)- pipe blending and smoothing the exhaust pulse also helps, as it effectively increases the area the exhaust pulse can expand into,
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