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Old 09-07-2007, 11:29 AM   #1
ganshert OP
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Inside a 950 ADV muffler, the ultimate cutaway view...

I tagged along with Ned to Wayne's house to do some surgery on 950 ADV mufflers.

The goals;
1. De-Cat a couple sets of ADV / SM cans.
2. Make a luggage rack for the SE.
3. Figure out how to mate a set of ADV de-catted cans to my old VFR

I'm talking with Wayne about #3 and this is how the conversation went...

Me; I need to fab up a mid pipe to mount 950 cans on my VFR
Wayne; what year VFR?
Me; '87
Wayne; no way
Me; yes way
Wayne; do you want a stock set?
Me; uh, yeah
Wayne; I have a BRAND NEW set off of an '86
Me; NO WAY
Wayne; YES WAY
Me; Woo Hoo

Wayne had been hanging on to this set for years becasue he knew somebody would need them someday. Thanks for being a pack rat Wayne. I owe you big time, I'll come up with something

this is Wayne, he has mad fab skills


this is Ned, Wayne, and the new guy (whose name I can't remember), he came by to see the stich Wayne has for sale on this thread

Ned; "So we are modding a 92 Goldwing trike for this years Baja 1000"
New guy; "hmm really" while thinking, you're weird
Wayne; "uh, he said Goldwing, cool!"



exhibit A; stock 950 ADV muffler


The plan was to sacrifice this one for the greater good. We know you all want to see what's inside right????

uh, how do you turn this on?


Wayne demonstrating proper technique


half way there



pulling out the little bit of packing? / heat sheild? material that got caught on the sharp edges when it was removed. It was a big sheet of fiberglass or some similar type of cloth wrapped twice around the metal mesh inner layer


cutting out the inner layer of mesh (outer skin, heat sheild material, inner mesh)


almost there!


Wayne said; "looks like a bong"


Ned said; "note the flow pattern"






so we concluded that the best way to de-cat it was to cut off the mounting flange, remove the cat completely, and weld the flange back on...




mmm, tasty cat





"I weld good"


so how much does a cat weigh???


It was so light that Ned thought he needed to hold it on the scale so it didn't float away. After he let go of it... 1lb.


Hope the internal view helps somebody.

Couple of points to remember;

the cat weighs 1lb

If your going to drill / hammer it out without cutting the end off the can you stand the chance of the pieces falling down into the muffler and you will have a hard time getting them out

If you cut the can open the best place to do it is just behind the flange on the tapered part so that you get the entire cat out instead of just the end of it. This is debatable but what we thought after we cut the first one open.

Any questions, what did we miss????

As for goal #2...

Ned and I played around with Wayne's sweet tubing bender and bent up some 5/8ths cromoly for a rack to keep Ned's soft bags off the exhaust and out of the rear wheel.






the bender was awesome, it made it super easy to make two mirror image supports for the soft bags

Neds gonna weld them up and post a pic for us.
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Old 09-07-2007, 11:43 AM   #2
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that explains why those stock cans get so HOT !!
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Old 09-07-2007, 12:43 PM   #3
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good report, Ganshert!

Anyone have a flow bench? We're interested in knowing what a cat flows vs. something that size unrestricted.
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Old 09-07-2007, 12:51 PM   #4
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Sweet report. Selling GS to get pipe bender..........and SE:)
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Old 09-07-2007, 12:55 PM   #5
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Beautiful! Let us know what the de-catted cans sound like. I've got a set of FMF Ti factory 4.1's on order (since June!!!!! ) and am thinking about alternatives to hold me over until they finally get them in production. Maybe they're waiting for enough orders...hint, hint.
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Old 09-07-2007, 01:12 PM   #6
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Super job guys!!!

You unlocked the holy grail!!!!....... or is it Pandora's box [pipe]?!?!

To Akra or not, that is the question!

After seeing your report I can see why de-cating the pipes doesn't make them any louder. The baffles keep the sound in check. To cure the excessive heat, removing the cat's is going to be an obvious solution... but to uncork that sweet v-twin sound?!?!?!?
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Old 09-07-2007, 01:18 PM   #7
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Quote:
Originally Posted by Uber-Moto
You unlocked the holy grail!!!!....... or is it Pandora's box [pipe]?!?!
To me, the issue is that the cans weigh ~11 lbs each (22 lbs total!), ~10 w/o the cat. I think good aftermarket options are more like 2 lbs.

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Old 09-07-2007, 01:24 PM   #8
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Quote:
Originally Posted by neduro
To me, the issue is that the cans weigh ~11 lbs each (22 lbs total!), ~10 w/o the cat. I think good aftermarket options are more like 2 lbs.


The hard parts catalog claims the Akro's are 59% lighter than stock.
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Old 09-07-2007, 01:26 PM   #9
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HOLY CRAP!!! You guys are awesome!!! How much did the sound change?
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Old 09-07-2007, 01:53 PM   #10
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cat's in heat!!

Now that I see where the cat's and where the baffles are, I'm beginning to think that the heat is not only b/c of the cat's. The shear amount of piping/tubing and metal found in the middle of the muffler absorbs the heat... like a heat sink of sorts.

Cutting off the mounting flange and welding it on a set of straight through pipes of your choosing seems like good solution for those (including me) who think it's preposterous to pay $1000 for a pipe of titanium! That is, if your objective is to cut the heat and gain some grunt - and not spend $$$$ doing it!!! Besides, you'll be the only kid in town slingin a Yoshi pipe on your 9fiddy!!!
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Old 09-07-2007, 07:24 PM   #11
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Quote:
Originally Posted by ganshert
Wayne said; "looks like a bong"
Wasn't this a prop for some StarTrek movie .... the one where they go back in time to get the drunk guy to make the first warp drive flight ever.

In fact Wayne looks a bit familiar .......
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Old 09-07-2007, 09:29 PM   #12
GPZ1170
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Nice job. I'm glad my old pipes were used well.
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Old 09-07-2007, 09:39 PM   #13
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Quote:
Originally Posted by GPZ1170
Nice job. I'm glad my old pipes were used well.
yup!

we were allowed more leeway in the destruction of the 950 cans since Wayne happened to have a stock set of mufflers for my VFR
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Old 09-08-2007, 07:35 AM   #14
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I removed the cats from mine , no real change in the sound but a slight rattle in one of the cans from I would guess a piece of tin from the casing of the cat falling into the can . no real temp change either . was it worth all that work , hell no . Now I have a set of wings on the beast , much better.
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Old 09-08-2007, 08:09 PM   #15
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Stupid question maybe, but why could you not just go with a pair of glass packed two stroke silencers? IT would be a little loud.. maybe.. but dunno just a thought.
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