Exhaust Gurus Please

[xschop]

Right before I did my final work on the swingarm, I chopped the rear flute shaped mufflers off my 4-2s. In doing so I cut off 2 chambers (one of which was already drilled out the back to give it a little more zing, and tick the neighbors off too. My question is if I machine or buy a large washer (2.5") to insert into the tip on the right, will it be adequate enough back-pressure, silencing, non back-firing? The hole diameter (@ 1") in the left pipe comes directly out of the headers by about 4-5 inches......All Input, Criticism, Yelling and beatdowns are greatly appreciated

[trbig]

Just a suggestion. (No beatdowns YET! )

But since that end looks like it's going to come off and on pretty easily, start with a washer with a fairly small hole and try it. You can always enlargen the hole... tougher to shrink it. Do this until you get negative effects, then go back a step or two. I'm sure you already know, but just make sure and keep both exhausts equal. Hopefully someone will chime in that's done this though and can narrow down the hit/miss for you and save a few steps.

I think this will get you the back pressure you need, but I don't think it's going to muffle the sound any.


Tod

[mro]

If there's enough space, can mount a washer in there welded to a bolt thru the bottom. Then can turn the washer to allow more or less restriction.


mro

[xschop]

butterfly valve

I do recall seeing a post like that. I plan on making about a 1/4" thick resticter/washer that will slip in and not turn sideways and run a polished stainless screw through tip/pipe so as not to weld and damage the pretty chrome. That way I can unbolt and put another size restricter in. I just need to know where to start...thank for your input. So since the two headers collect into the single 1" tube, you think I should start at 3/4" exit hole?

[xschop]

Loud

"I think this will get you the back pressure you need, but I don't think it's going to muffle the sound any."

I haven't cranked her up since cutting the pipes off. Should I wear earplugs? Can't wait till my neighbor's pit bull comes to the fence

[mro]

Since your making the "restrictor" why not start with 3 small holes which can be enlarged or added to if needed. May help with back pressure.


mro

[prometheus578]

"Judging from the photo..."

Can't wait till my neighbor's pit bull comes to the fence

It looks like he's done that, done gone and you done stepped in it.

This reminds me of those MYSPACE photos, or whatever.... teenage girls taking nude pics of themselves reflected in the bathroom mirror. I loved the one where the girl should have flushed first!
A professional photographer... you aint, XSChop!

[mitch]

Lolliepop

Some ppl call them a lolliepop, you take a big washer and weld a bolt to it drill a small hole in the bottom of your exhaust and mount the lolliepop in there with a double nut on either side of ur exhaust pipe. It will give you back preassure and quite her down a little.
Doug

[xschop]

poop

That yellow "poop" is from the spray foam I used to make the fiberglass mold, PROMESSWITHUS. I like MRO's idea, but will three small holes quieten her down as compared to one large one?

[mro]

Have not a clue
but
should change the acustics? verses a single large hole.
6 or eight smaller holes ? Two resitictors with off set holes?

Only takes time, trial and error


mro

[trbig]

PROMESSWITHUS

Now THAT is pretty dang funny! (And fitting..)

[xschop]

Trial and error

O.K. I will machine one set with a single 1" dia. hole and another set with three 1/3" holes and try the two....thanks MRO and Thank you too, Pro

[mro]

quote:
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PROMESSWITHUS
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Now THAT is pretty dang funny! (And fitting..)


__________________

Try your hardest to be the kind of person your dog thinks you are.
Bet Prom has achived that


mro

[mro]

Three 1/3" holes be significantly more than a single 1" hole.


mro

[audijunky]

I currently have the "lollipoop" in my mufflers. To be honest I am not sure it helped with back pressure. Maybe my wwahers are to big but it also did not make it any more quiet. Not really a noticable difference. maybe a little different tone to it but thats it.
Now I did have to put what you would call a silencer on My VW golf. It has a full header back exhaust w/ 1 borla mufler and was loud as piss. After installing the silencer I made it was ALOT quieter . Only real differences between the two is the ones on the bike do not fit tightly into the pipes and THere is a gap all the way around the outside of the washer. the one on the VW is actually 4 inch a piece of tubing welded horizontally through the washer.. So I am figuring , if you were to fit your piece tight into the pipe, with the smaller Dia hole it will probably have the same effect that my VW's had.
JM2C