Atypical Commando Exhaust

I have searched throughly for an exhaust system in the states for my Norton to no avail. Even asked around on here a few times.

What I currently have is a beatup set of (name unknown) 1-1/2 in 2 into 2 that run down the right side only. They have a nice sound and flow good, but the reverse cone megaphones would drag on every right-hander. They are now gone and I have been riding with just the pipes (much to the dismay of neighbors) which I have been liking, still need to make some tuning adjustments to compensate. I like the look of the minimal exhaust and need one as all the stock mounting points for a silencer are gone. (short header, or as short as performance allows, and the smallest least restrictive reverse cone megaphone I can find.) I really liked the TT pipes viking makes, but from what I have seen recently I am not sure I want to deal with them. And my wallet certainly agrees.

The other thing is clearance, I want something that tucks in well. I have managed to scrape even the stock headers (meant for Peashooters) I wouldn't mind a "S" or "SS" set up.

Does anyone know of someone in the states that makes reasonably priced system, 1-1/2 in or bigger, that strays away from the Pea-shooter or Dunstall systems???

The other thing is silencers, I am assuming a 10-12 in mostly open reverse cone megaphone is going to be a custom item?? If not let me know.

If only I had a fab shop....
-strong

Currently I am saving up for a totally custom set or Maney set

You need to find your nearest local ye old chopper shoppe ?
They will fab you up something suitably evil....

There is a thread just down below here about el cheapo MAC 2-1 exhausts.

Short pipes tend to be smaller a dia for good low end. With open pipes a Norton can compete with a big twin for loudness but less obnoxious. Btw might thin about lifting the bike a bit for more leaning. If ya could take a photo of the front and rear tires please so I can sniff the G's applied to em. Road rash scars on part are cool to show too. You could add a tube to the current one and start looping off til not so nice then make next set will it perked up best. Bigger OD has a deeper sound of course and more eager top end.

Look for someone that has a Mandle bender and is good at working it, some old exhaust shops may still have the old Mandle bender, I got my header pipes made for my 850 Norton engine in a Wideline Featherbed frame 33 years ago by a exhaust shop here in Brisbane, they were made to tuck right into the frame and a bit more upswept at the end of the headers, I run upswept Cocktail shaker mufflers, Ian Toy who bend the pipes knew what he was doing, did everything by eye and took only 30 mimets to make the 2 headers and next door to him was a chrome shop, these headers are still on my bike after all these years and have never scraped them :twisted:

Ashley

To have a shop make custom pipes means your bike better be there but a great way to go, unless you buy bent tubes and slice up and weld up like them hi end wonders in magazines. Hi end headers are made of special alloy I forget the name of, nickelodeium" ?

You have to have the bike there to get fitted properly, when Ian started the first bend he took it off the bender to see if it was right then went to the next bend and so on, the last part was he had to put the exhaust clamp to the head on the peice of pipe with the flange on and screw it into the head and sit the headers in postion with all the pipe bolted on before he welded the fange to the header pipe, in 33 years my pipes have never come lose and are hard mounted where the mufflers bolt to the frame, my motor is hard mounted in the Featherbed frame so no movement at all. the best part was when he did this in 1980 he only charged mr $20 to make them and another $20 to get them chromed, the good old days.

Ashley

" Atypical " :lol:



http://www.vikingexhaust.com/

Though certain chaps would grab a pile of pipe bends , the Oxy Gear , and a hack saw .
Stainless steel , if youre in for a Pound . ! :lol:

Megas ! ? :shock:

These can have a tendancy to be ' a trifle loud ' , as theyre unbaffled & somewhat ROWDY , being to Increase the extraction .
Were some ace Dirt Track style , compact reversed lip , about a foot long , 4 in dia , with a three in. outlet . which I saw
a set of , just like the flat track ones . You would of course need Ear Plugs , useing these . :wink:



Not sure if this didnt state 1 7/8 o.d. headers ? Always meant to do a ' S ' type with that , 1 3/4 bore - plug in .
Good fix if the threads'r fu nny . Look up ' Robbie Dean ' here , I ran a similar ssystem , headers joined under front ISO ,
double volume ( 1 7/8 ? ) pipe under , to mega as thus . Before the mega , ' a fried ' tack welded a 1 in tag across the end of the 1 7/8 pipe .
It blew off . Was noisyer thus than with mega , which only got a loud drone at over 3.500 or over 2/3 throttle .

Couldnt drag it , anyway . :lol: 8)



ah well , bore a vauge resemblance , anyway . Mega started say under gearbox , and ran straight .
Thought I lost power , with the ' S S ' cam ( & other mods ) over the Interstate headers & hollow ' mufflers ' ,
but with ' S ' ( std. ) cam was seamless power from 800 rpm to past 7000 . had to watch the tach if useing high rpm .
Would light up the rear in the wet , dropping the clutch with a bit of throttle on , in 2nd @ 40 mph , & stay spinning .
on tall gearing .

Yeah man a hot Commando should float it front leaping forward on torque rise. Do note the open area left for fender tire clearance in case of bottoming the forks.

" not typical; not conforming to the type; irregular; abnormal: atypical behavior; a flower atypical of the species. "

Standard Triumph megaphones are suitable ! E3479 / 027 / RH & E3479 / 027 / LH

a portion of the reverse cone must be removed to increase the final opening to 2 9 / 16 " .

A false drivers liscence , dual identity , and concealed garadge may be adviseable , if useing these .

http://www.billymegawatt.com/uploads/6/ ... racing.pdf ( that ' other ' make )

earlyer the 1 3/4 o.d. x 32 . 5 in. to valve head ( 28 1/2 " pipe ) was the hot set up .

Hence the belief that 1 7/8 o.d. on a 750 commando ( worked ) , would have to be ' interesting ' . :lol:

Matt Spencer said:

Click to expand...

That belt looks awfully tight.

I picked up a set of Hooker TT pipes a while back. Watch ebay, they show up every once and a while. I only paid $50 for mine.

hobot said:

Short pipes tend to be smaller a dia for good low end. With open pipes a Norton can compete with a big twin for loudness but less obnoxious. Btw might thin about lifting the bike a bit for more leaning. If ya could take a photo of the front and rear tires please so I can sniff the G's applied to em. Road rash scars on part are cool to show too. You could add a tube to the current one and start looping off til not so nice then make next set will it perked up best. Bigger OD has a deeper sound of course and more eager top end.

Click to expand...

Just got a new rear tire and the old one doesn't look too good...Swing arm bushing let it wear pretty bad in the center before I got I put split collars on it. Found it the hard way with a bad speed wobble on the interstate in chicago...not fun. But I will get some pics when I get home today and get the exhaust on. Just finished up a tranny rebuild so hoipefully get to fire her up today.

As far as noise, I'm not going for super loud, but loud enough cars know I am there. The megaphones I had on it were perfect sounding, All they had were 1 or 2 baffles otherwise it was pretty open. Created just enough back pressure to keep it from popping when you roll off the throttle.

I was straying away from the small diameter pipes since I plan of doing head and cam work on it in the future, but one thing at a time.

Does anyone know about the heat coatings and what kind of shops so that sort of coating. I like my Al to shine, but don't care too much for the chrome.
-strong

I picked up a set of Hooker TT pipes a while back. Watch ebay, they show up every once and a while. I only paid $50 for mine.
[/quote]

Did you fab the silencers?

I am surprised myself, but I have yet to get into trouble running the open headers...that even includes riding by the police station on my way to work...

No they are from cone engineering

" but I have yet to get into trouble running the open headers... "

Thats because its a SOUND , Not a Noise ! . 8)

Here are some pics:

Just got it back running after a tranny rebuild and a few other small things.
Rebuilt the oil pump and shimmed the relief valve...now I make 40psi crusing!! now I have found all the other leaks I did not fix previously lol.

Pardon the rough look, Ive been keeping it going and haven't had time to polish.

I use two Kawasaki Z900 header pipes and a collector under the motor. The tail pipe and absorption muffler IDs are twice the crossectional area of a header pipe, so there is no restriction. I've advanced the cam to compensate for the pipe. It is probably too loud for street use, however it is very effective - gives loads of torque, and I run higher gearing.

If it hasn't been jetted to suit, you'll burn the exhaust valves in no time flat - on the highway - with no mufflers or backpressure.

jnstrong said:

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It has been rejetted.

Check these out for "something different"

http://www.flatracer.com/#/cafe-racer-e ... 4586065916

I have a set of Megacones. They come with universal fit attachments that actually work quite well on different bikes.