Were balanced exhaust pipes used on late model 750's?

Since the flood victim came with a spare set of crossover headpipes and I was able to salvage the crossover pipe and clamps (but not the bolts and nuts) from the original set, I'm sticking with them despite inherent cracking problems and no percievable performance advantage. I have some Emgo Dunstall copy mufflers I got from GrandPaul and I'll probably mount them until some decent peashooters become available.

Danno said:

Since the flood victim came with a spare set of crossover headpipes and I was able to salvage the crossover pipe and clamps (but not the bolts and nuts) from the original set, I'm sticking with them despite inherent cracking problems and no percievable performance advantage. I have some Emgo Dunstall copy mufflers I got from GrandPaul and I'll probably mount them until some decent peashooters become available.

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I think there is a performance difference with a balanced exhaust. IMHO

Ron L said:

Frankly, I didn't notice any difference and only a slight reduction in noise with them in. Of course I was a 23 year old kid at the time and wanted as much growl and grunt as I could get.

I found the 230 to be a little too rich without the mutes, so I installed the 220's. They are still in there.

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I was a 22 years old, and they seemed noisy even then - needed earplugs to take it very far, or my ears were ringing.Helmet too - haven't helmets got quieter since then. Musta had good hearing back then !

Workshop manual says it only needs 210 with the mutes, 220 without - but that is 1972 not 1973...

jimbo said:

I think there is a performance difference with a balanced exhaust. IMHO

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In what way ??

Dynodave has already noted with mutes they need balanced pipes, or there is not enough gas flow possible for good performance.
But peashooters with mutes are long gone and a thing of the past, not a consideration these days.
??.

I am not usually one to endorse Dunstall produces most ARE of poor quality, but the 2-1-2 exhaust was developed by the late Dr Gordon Blair I just don’t seem to be able to find the dyno chart for this;

“In the search for a more efficient exhaust system without additional noise, Dunstall worked closely with Dr Gordon Blair of Queens University Belfast, Ireland. The exhaust pipe design (two-into-one-back-into-two) was entirely Dr Blair's while one of Dr Blair's students, Sam Coates, and Paul Dunstall helped to work out the silencer design and dimensions.

Ref; http://dunstall.com/

http://www.epi-eng.com/piston_engine_te ... nology.htm

NOTE the Dunstall centre stand will be required with this exhust :!:

Danno said:

Since the flood victim came with a spare set of crossover headpipes and I was able to salvage the crossover pipe and clamps (but not the bolts and nuts) from the original set, I'm sticking with them despite inherent cracking problems and no percievable performance advantage. I have some Emgo Dunstall copy mufflers I got from GrandPaul and I'll probably mount them until some decent peashooters become available.

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Why did Norton use a solid pipe and not a flex pipe like the Dunstall ones? I'm working on a bitsa Norton and have a set of late pipe with the crossover, being cheap I am going to use then but I am installing a flex pipe in place of the ridged one.

John in Texas