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Non annoying muffler choices |
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wittsend
AMC Nut Joined: Apr/15/2020 Location: California Status: Offline Points: 413 |
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I'll agree to that. I have a 318 V-8 Valiant. Two stock cast iron manifolds combined into a 3" pipe with a three chamber (50 series) Flowmaster. The D-R-O-N-E from 1,900-2,600 RPM was utterly unbearable. The drone didn't blend in gradually, it came and went IMMEDIATELY. The military could have used the results for sonic warfare. Using what I had on hand I switched to a 2-1/4" pipe and a Raptor (turbo style) muffler. That only somewhat toned down the drone. The cast manifolds, the blending the two into one pipe thus the quieting pulse effect of an H or X pipe, reducing the pipe from 3" to 2-1/4" and swapping the Flowmaster for a Turbo style muffler should have all contributed to avoiding if not significantly dealing with the drone. Yet it made only a marginal difference. The cam (Edelbrock Performer clone) in that motor has 58 degree overlap. I often wonder if that is a contributor to the droning???
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'63 American Hardtop
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1958 rambler super
AMC Addicted Joined: Dec/10/2020 Location: Victoria BC can Status: Offline Points: 1193 |
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This has been a really good thread I started, gathering lots of info and opinions.
Why is longer better farna? Edited by 1958 rambler super - Jan/12/2023 at 8:58am |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6762 |
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That is pretty easy from a design point of view. Think trumpet vs tuba in length vs pitch.
You want lower frequency sound, longer in almost all cases will provide it. It takes a lot more work to get a lower frequency out of a short muffler without having to restrict flow with multiple chamber passes to get the same relative tube length in a smaller case.
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dkrtgood
AMC Addicted Joined: Jun/27/2011 Location: St Pete, FL Status: Offline Points: 1370 |
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I truly hate loud drone, I put a jegs cat back mustang kit with mandrel 2 1/2 tube and it is louder than I would like. I don't like the sound of any stainless exhaust so it's just alumanized steel. I just pulled down front x pipe and put 12" glass packs in ahead of x to see if it quiets it down any.
390 with free flow manifolds, 2 1/2" full mandrel bend pipe and x pipe all the way out tailpipes. If this doesn't cure the drone i will just swap mufflers...they were stated as turbo style in the jegs kit..
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Dave Goodwin
President of Tampa Bay AMC 70 Mark Donohue BBO 390 5-speed 77 Matador Coupe AKA "The Beave" 70 Javelin 360 / Auto - BBG |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6762 |
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Typically the only reason SS will sound a little "tinny" vs CS is because it's made from thinner gauge material, all else being equal.
The problem with 68-70 AMX/Javelin with 2-1/2" pipes is that you can only fit a 14"x9" muffler if put in the stock location. Short muffler, "tinny" sound and more drone. Add to that, an X pipe will sound "tinny" vs an H pipe. I have the same on my car, changed to turbo from glass pack mufflers and reduced the drone by half, but the next thing would be to put a resonators in front of the X pipes. Wish I had done the H pipe - live and learn! IMO, the Walker Quiet Flow SS muffler is one of the best for sound, Flowmaster 50 next. Too bad neither comes in an offset 14"x9" - 2-1/2".
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dkrtgood
AMC Addicted Joined: Jun/27/2011 Location: St Pete, FL Status: Offline Points: 1370 |
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Yeah i'm hoping that adding 12" glass packs ahead of X sort of a resonator squashes it enough. Never cared for the high performance dynomax or flowmasters...I drive my car daily and would want to shoot myself listening to that crap daily
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Dave Goodwin
President of Tampa Bay AMC 70 Mark Donohue BBO 390 5-speed 77 Matador Coupe AKA "The Beave" 70 Javelin 360 / Auto - BBG |
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amxdreamer
AMC Addicted Joined: Jul/30/2008 Location: Vancouver, BC Status: Offline Points: 8494 |
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H pipe and magnaflows on my AMX, duals with magnaflows on the cop car with no H pipe. The cop car has a nice burble at idle and driving but is pretty loud and barks when full throttle compared to the AMX.
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Tony
Vancouver, BC 1970 AMX 1972 Badassador AMO#10333 |
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Mr_Roboto
AMC Apprentice Joined: Jun/12/2022 Location: Wisconsin Status: Offline Points: 221 |
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Walker Quiet Flow in the biggest case size that fits. SoundFX if you want a bit of volume to it.
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70Xcode
AMC Fan Joined: Jan/25/2023 Location: NJ Status: Offline Points: 14 |
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I use tractor supply tractor mufflers if what you want is cheap and quiet
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THE MENACE
AMC Addicted Joined: Nov/04/2008 Location: So. California Status: Offline Points: 4428 |
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Yeah, if you put the wrong muffler on a six cylinder it can make your car sound terrible! Dennis |
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Former Owner of:
The Craig Breedlove "AERO AMX" Still Owner: SS/AMX #9 replica (THE BIG MENACE) 70 AMX 416, EFI, Nash 5 speed 70 Javelin 401, 727 (Wife's) 72 Gremlin Autocross Project. |
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