2 into 2 headers ?

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CalAl

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I like the look of the later more curved stock headpipes - what years had these? I'm aware of the reproduction early style pipes at mikesxs, but don't like the more angular look. Can anyone direct me to a later style 1 1/2" header copy, or should I be looking for a used set of stock pipes?
Thanks
 
- these are the 'special' type headers-i like them too but no one makes a std production run of these that im aware of...what we do is get a group of buyers together and have a run of stainless ones made, with mounts and flanges-10 pairs usually, for cost reduction-by one of these blokes with a computer operated pipe bender, they come out perfect, made slightly over length so you can fit to your liking
 
Yeah, that bend is nice, and not just because of appearance. It's one wide-radius bend rather than a pair of tight-radius turns--much better for flow. I'd love to have a pair in 1-1/2".
 
I'd be interested in a set of 1 1/2's too. Rough idea of cost & would whoever organised it be willing to post to me in Australia????
 
Is anyone taking on this endeavor?
I could take a set, maybe two if we had to keep the numbers up.
Cheers
Tim
 
Got an email from Mike at mikesxs.com - he tells me that he expects to have this style headers (not stainless) available by the end of Feb. But I'd be interrested in some stainless ones if not too pricey..
Alan
 
Is it true that the 1 1/2" pipes will give better low end grunt over the 1 3/4"? Would they also run quieter? Mine with Mikes 1 3/4 with mufflers will put your average open piped harley to shame.
 
Power peak is a function of length (shortening pipe moves peak hp farther up the rpm range) and torque peak is a function of pipe diameter (increasing diameter moves peak torque farther up the rpm range). 1-3/4" pipes work fine on a racing flat tracker that's built with rods and welded crank that'll take rpm's in the neighborhood of 10K, but on a street bike with a 7500 rpm redline they'll move the torque peak way out there where you'll never reach it, even with displacement bumped to 750 cc.'s. Michael Morse's Torque Peak Optimizer inserts are designed to correct the torque peak in large diameter pipes on street engines. 1-1/2" pipes put the torque peak where you'd want it. How quietly the pipes would run depends on your muffler selection. More noise does not equal more power.

That having been said, a lot of things that aren't optimal can be made to work well.
 
I like to exhaust bend of the Specials over the Standards too. I would seriously consider purchasing a set provided they were SS with an I.D. of 1-1/2", and available at a reasonable price. Any idea what the cost might be?

I suppose there will have to be consensus amongst the group willing to go forward with an idea like this on final purchase cost, materials & dimensions... Dan
 
There are a couple of conventions to be aware of regarding exhaust specs. Length is specified on the center line, and diameter by the OD of the pipe, with 18 ga. being the standard thickness. A 1-1/2" pipe (just fine for a hot street engine even in a 750 cc. displacement) will thus have an ID of just over 1-3/8" (or just at 1-3/8" if 16 ga. material is used). Tuned length, however, is specified from exhaust valve to outlet, again measuring on the center line. Michael Morse shared a rule of thumb with me awhile back that seems to work pretty well; on these engines, measuring the pipe on the outside line gets you very close to the tuned length.

Guys, let's not assume that anyone wants to pick up the responsibility of administrating a group buy on a bunch of pipes. With collecting funds, shipping, and so on, it can be a major PITA.
 
A local guy has a pair of Supertrapp cans meant for his XR750 dirt tracker that I could fit - I've talked to Michael Morse about about street exhaust systems for the XS650 and he likes the Supertrapp. The way they're built sure doesn't look like they'd perform like a straight open can, as the gas has to exit through a series of slots in effect. Can you enlighten us?
 
I love SupperTrapps - Plenty of free flow. Here's a photo of them on my Guzzi and soon a pair will be on my XS650. They are available in polished SS, Brushed like mine and Black. Only $165.00/each come in varous inlet diameters from 1.5, 1.75 and 2.0. These are 2.0 with custom SS transition pipes.

IMG_1599.jpg


My question is with MIkes SS headers the crossover is lost how does that effect the Torque/Horsepower/RPM relationshiP?
 

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