FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: RangerRat on May 22, 2019, 08:45:08 PM
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Anyone else noticed that their exhaust sounds a lot different after swapping to an Edelbrock RPM intake? I previously had a cast iron 4bbl intake.
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Only obvious things that come to mind are vacuum leak and ignition timing. Retarded timing will give a slightly lopier idle and advance will slightly smooth it. Lash setting the same?
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IIRC the RPM does not have a heat crossover?
Seems like I notice a little difference in sound when blocking the crossover, it acts like a mini-H-pipe.
I could also see where the intake might "howl" differently due to runner or plenum shape & size but never really noticed it.
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It's not the timing. That was my first thought too. I was wondering if no heat crossover could be it. The motor runs great. And definately pulls higher up the rpm range than before. But as soon as I fired it up I noticed it really changed the sound of the exhaust. Kind of an off idle throbbing sound. Like a blurb, lol. Almost makes me think of the way an AMC V8 sounds. I really liked the way it sounded before. Full throttle still sounds the same I think. Kinda disappointed. But as long as it runs strong
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i noticed a different exhaust note changing carbs.650 to a 850.i would guess any time you change the intake or carb it changes the amount of air going in it could change the exhaust note to some degree.
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I guess so. It was unexpected though. Another thing I've noticed. I have 40 Series Delta Flows on it. And on my CJ-7 with an AMC 360. Now the CJ is kinda loud I guess. But, whoa, that 390 is unbelievably louder than the AMC motor. But the 390 probably has twice the horsepower too lol
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Yes a intake will change sound some a cast iron duel plane makes a cam sound bigger at idle i went from a stock cj.To a streetmaster it sounded different at idle.Same on a 351c from stock to a torker
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Hmmm. Well it definately changed mine. Can't say I like it as well. But the motor definately breathes better. I also haven't noticed any spark knock since changing the intake either. It was a constant battle before.