Two DIFFEReNT slip-ons. Wtf?
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Road Captain
Joined: Apr 2012
Posts: 628
Likes: 14
From: Sweden via Bisbee, Az.
Two DIFFEReNT slip-ons. Wtf?
So I hear this really pronounced 2 beat. This guy pulls up in a 90’s heritage. I noticed he had dual exhaust with one factory issue torpedo muffler and the other had an older SE slip-on (the kind with almost no baffles).
So the result is one pipe loud and the other at about 1/2 volume. I have to admit it sounded great, but won’t this severely screw things up?
So the result is one pipe loud and the other at about 1/2 volume. I have to admit it sounded great, but won’t this severely screw things up?
Road Warrior
Joined: Feb 2021
Posts: 1,340
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From: Chicagoland
Interesting, did you notice if it had a stock y-Pipe? I wonder if he was trying to put more back pressure on one side to get more flow through the y-pipe or something................. if that worked we probably would have heard about it. Like maybe two different baffles in the same type of slip on or something.
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Road Captain
Joined: Apr 2012
Posts: 628
Likes: 14
From: Sweden via Bisbee, Az.
I wish I had talked to him and found out, because I have never seen this on any ride.
It gave the bloody exhaust a 3 dimensional sound, truly terrific.
Yes, it was stock. Strange...
Grand HDF Member
Joined: Jun 2008
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From: Ohio
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Fluid dynamics is a crazy complicated area. There's no telling what kind of odd-ball resonance effects he's got with that setup.
But I can't visualize a scenario where any of that is going to actually cause any damage. ("Timing"? No chance.)
Worst thing I can imagine is he has dramatically different scavenging on each cylinder. Even that is going to be limited by the presence of the crossover.
You can never say never, but absent any hard data showing otherwise, I don't see how this setup could hurt anything other than performance.
But I can't visualize a scenario where any of that is going to actually cause any damage. ("Timing"? No chance.)
Worst thing I can imagine is he has dramatically different scavenging on each cylinder. Even that is going to be limited by the presence of the crossover.
You can never say never, but absent any hard data showing otherwise, I don't see how this setup could hurt anything other than performance.
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Road Warrior
Joined: Dec 2012
Posts: 1,539
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From: magnolia tx
With out a cross over he would have different back pressures to each cylinder which is not good, but it has a cross over minimizing that, so like Omaha said I don't see any real damage that will be done except maybe performance, but if one muffler is much more restrictive than the other most of the exhaust gases are going to flow out the less restrictive one, like having a single exhaust
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Road Captain
Joined: Apr 2012
Posts: 628
Likes: 14
From: Sweden via Bisbee, Az.
Now I know how I can build my Frankenstein. My next build is to be a borderline rat FL with mucho rust, braced fenders, suicide, an old springer that has been hanging on the wall staring at me for years, the whole bit. A quasi barn find. I have long since been waiting for a Flathead Power Knuckle to come up used, a unicorn for sure. The main reason was the sound. I’ve got a nice Evo from a donor bike that I didn’t know what the hell to do with. Now I am going to give it a go with that. No excuses anymore.
I just didn’t want another vintage build that sounds like an Evo.
I have a ton of misc parts laying around and will try different slip-ons, but will most likely build my own from open pipe. Different degrees of baffling (read: more or less welded washers) in each to get the right sound. Hell, if I nail the sound with an odd matched factory pair, no sweat, it’ll just play into the whole rusted Frakenfurter FL vibe.
I never thought of tuning the sound this way and it is way more dramatic a change than anything I have played with before.
Cheers.
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