Transverse muffler solution
08-26-2022 | 04:53 PM
#1
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From: BC
Transverse muffler solution
In the 80s, my Dad built a set of stainless exhaust manifolds for a 350 powering a Volvo 280 drive.
It was/is in an 18ft K&C boat. Just a regular runabout made in Vancouver BC.
What they did was also fabricate a transverse muffler system, that mounted up close to the transom. All wet flow, that exits to thru-hull with flappers. The intent was to maximize flow, while eliminating a lot of the bark from thru hull exhaust.
It seems this would a good solution to a lot of the bark issues from thru-hull and maintain high flow.
I like a good V8 bark as much as the next guy, but muzzling it to an acceptable level without being abnoxious, would be great.
On my Glen-L Thunderbolt, with Nixon ex manifolds...no risers...I can look into the hull port and see the ports to the head.
I'm looking at making up a transverse muffler system for my Formula 233. With TRS, it has even more room to have a tuned exhaust system.
Likely go with EMI manifolds, and fabricate risers to drop and feed the muffler, to thru-hull.
Was thinking injectjng the raw water in the muffler vs risers...to prevent reversion, and get better cam timing.
It was/is in an 18ft K&C boat. Just a regular runabout made in Vancouver BC.
What they did was also fabricate a transverse muffler system, that mounted up close to the transom. All wet flow, that exits to thru-hull with flappers. The intent was to maximize flow, while eliminating a lot of the bark from thru hull exhaust.
It seems this would a good solution to a lot of the bark issues from thru-hull and maintain high flow.
I like a good V8 bark as much as the next guy, but muzzling it to an acceptable level without being abnoxious, would be great.
On my Glen-L Thunderbolt, with Nixon ex manifolds...no risers...I can look into the hull port and see the ports to the head.
I'm looking at making up a transverse muffler system for my Formula 233. With TRS, it has even more room to have a tuned exhaust system.
Likely go with EMI manifolds, and fabricate risers to drop and feed the muffler, to thru-hull.
Was thinking injectjng the raw water in the muffler vs risers...to prevent reversion, and get better cam timing.
08-26-2022 | 05:12 PM
#2
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From: On A Dirt Floor
Mastercraft boats do something kind of similar. Not a muffler per say but puts it under water to make it quiet. Lol. It’s called ‘Fresh Air Exhaust’ just because puts exhaust inwater vs in air bothering skiers/boarders.
Anyway - i like your thinking. Keep us up to date on your progress.
Anyway - i like your thinking. Keep us up to date on your progress.
08-26-2022 | 06:17 PM
#3
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Joined: Aug 2019
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From: BC
Nice looking setup.
My Thuderbolt exhaust isn't too bad in the boat...but wherever the back end is pointed...is rugged.
A proper manufacturer ski boat would have to have a quiet exhaust to keep the girlfriends and wives happy... !!
One of the factors I have to contend with, is what height to make the thru-hull on the Formula 233. It has the factory swim grid, but I'm not against moving it up a touch.
I wanted to beef up the swim grid slightly to mount a 2-Stroke kicker. Something easily mounted in some water...and not obtrusive. But I hate the idea of a single.
Here is the 350 Volvo 280.
Drive has about 20k hours on it. Mostly all original. Well maintained.
My Thuderbolt exhaust isn't too bad in the boat...but wherever the back end is pointed...is rugged.
A proper manufacturer ski boat would have to have a quiet exhaust to keep the girlfriends and wives happy... !!
One of the factors I have to contend with, is what height to make the thru-hull on the Formula 233. It has the factory swim grid, but I'm not against moving it up a touch.
I wanted to beef up the swim grid slightly to mount a 2-Stroke kicker. Something easily mounted in some water...and not obtrusive. But I hate the idea of a single.
Here is the 350 Volvo 280.
Drive has about 20k hours on it. Mostly all original. Well maintained.
