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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 10th June 2012
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Default Custom 2 in 1 exhaust question

Was looking to put a 2 in 1 exhaust on my 79 XLS. Sportyspecialty.com sells one that would fit, but by the looks of the way the pipes run it might not work with forward controls, which was going to be my next project, also those pipes are like $500 which could be spent elsewhere on the bike, so I was thinking why not just cut back the drag pipes I have now and weld a big old 3 1/2" pipe across the bottom connecting the 2? I really know very little about exhaust systems and what will work and what wont, not to mention the effect on horsepower.

Any feedback would be appreciated.
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Old 10th June 2012
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Its all about back preasure to keep the horsey's where they should be in your low & mid range acceleration. If you do something like what your'e describing you will need to buy or create a baffle that constricts the out flow enough to do the job, without creating to big a blockage. Then , the only way to measure what youv'e accomplished will be to dyno, or just plane "feel" it, when riding. Compromise on the cash by buying used (craigs list & ebay), so you know what you have, and can jet accordingly. And you can get info from the manufacturer on weather fowards are compatable. You can also ask some of the guys here if they will work, after you identify a brandname. Good luck with it.
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Old 10th June 2012
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this is a common way of doing it....there are a few posts that show this technique of making 2-1's

http://xlforum.net/forums/s...283733&page=10
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Old 10th June 2012
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It's not so much about back pressure, it's about arresting the reversion.
Without restricting flow....

If you cut off drag pipes the rear pipe will be too short.
Most 2 into 1 systems do not have a long enough rear pipe.

Here is an example of a very well designed 2 into 1 system.
(sadly they do not catalog a system for an IronHead)


The rear pipe must come forward around the timing cone (at least) to get the length necessary for best low end power (without hurting top end).

I think you can work out your forward controls around the Sportster Specialties 2 into 1 system. There is a gap between the 2 pipes and the front pipe is tucked way in.

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I have a set just like that evo set for an ironhead sitting in my garage. Just the header though.
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Old 10th June 2012
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I guess aside from the cost, making my own crap is half the fun. so taking into consideration the replies I got, I'm thinking of not cutting the pipes down but making my own slip on/weld on deal.
[IMG][/IMG]
This could work?
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ive got an entire OEM 2-1 set up that came original on the 77-78 motors that im not using and really need to get rid of if your interested. ive seen good used sets on ebay sell for up to 500$$ but im not trying to get near that. the ones i have have a few dings on the header and will need rechromed. the muffler/collector is a new take off from back then.
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The picture from SS looks like the front pipe is forward and drops straight down. I suppose a call to the company they may know what is in store for mounting.
I'm sure you are not the first.
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Anyone know a good site where i might find a reducer from 1 1/2" to 3 1/2"? I think ill probably need to use 2 reducers inline, should be fine have 12" to play with. Wife just said "You Wish" over my shoulder .
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Old 10th June 2012
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Quote:
Originally Posted by Orca76 View Post
I guess aside from the cost, making my own crap is half the fun. so taking into consideration the replies I got, I'm thinking of not cutting the pipes down but making my own slip on/weld on deal.
[IMG][/IMG]
This could work?
The front and rear pipe need to be as close to equal length as possible.
Biltwell sells a kit that will help you.
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