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

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  #31  
Old 8th November 2018
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What's wrong with that exhaust? If my memory serves, when Chevelle was doing all of his dyno testing with different cams and exhaust, he got some of the best power with them. Maybe he will see this and chime in and confirm.
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  #32  
Old 18th May 2019
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Well it been a while but I ended up using some scrap exhaust pipes and peices of junk I have laying around and just made a simple 2 into 1 that attaches to the OEM header.

Just got it tacked together right now, so don't know how it's going to act but it sure does sound good. Im sure it will be a little better than just running the open header alone. And after it's chromed, if I like it, it will look nice too.



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  #33  
Old 18th May 2019
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Sorry don't know what the hell happen with picture size. Never had that happen before
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  #34  
Old 18th May 2019
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It needs a cone or muffler to block/attenuate the reversion wave.
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  #35  
Old 19th May 2019
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how does it run? it look's a bit restrictive at the merge.
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  #36  
Old 19th May 2019
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Yep, straight pipes suck. If you want your bike to run like crap, especially mid-range, that's the way to go.

Forum member Natez just modified that same muffler on his 78. Sounds and runs great. Message him and ask how he did it.

I have several NOS mufflers if you want to buy one to experiment on for fifty bucks plus shipping
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  #37  
Old 20th May 2019
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Quote:
Originally Posted by brucstoudt View Post
how does it run? it look's a bit restrictive at the merge.
A venturi at the merge has proven to be beneficial, look at a ThunderHeader or a SuperTrapp.
The cross section area of the merge is usually slightly larger than the primary tubes,
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  #38  
Old 2nd June 2019
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I ended up cutting off 14 inches to get the overall length to 42 inches.

Before I made this, I just had the open headers that sounded great but they did lack in performance at any speed below 4000 rpms. We all know that.

The bike would stumble at wide open throttle at anything less than 4000. Anything above 4000 it would just scream! Since I put on this 2 into 1, now the stumble is gone. I can crack WOT anytime and it just screams.

It seems to run very good and definitely an improvement from what I had. A bit restrictive? Maybe, that was kind of the point.

I'm no exhaust expert, or an expert at all as far as that goes, but I know improvement when I feel it. When your motor is happy, it's happy.

Think I'm gonna run with this for now and experiment with some more set ups.

Moon, I look for a thread and messaged natez with no response. You have a link?
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  #39  
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thanks for the update.i have a suggestion if you are going to try variations.where the 2 pipes merge into the single.instead of stuffing the 2 into the single try having them fit over the outside of the single pipe more like a collector.
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  #40  
Old 10th June 2019
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Quote:
Originally Posted by brucstoudt View Post
thanks for the update.i have a suggestion if you are going to try variations.where the 2 pipes merge into the single.instead of stuffing the 2 into the single try having them fit over the outside of the single pipe more like a collector.
I didn't stuff anything inside either end. The 2 com down to 1.75 in ID and butts up to 1.75 ID

I must have got lucky when I put this together. This sum bitch made huge difference. It a running harder than it ever has.

It's running so good the clutch won't hold when I really get on it.
I took the clutch apart again, all components only have about 2000 miles on them. OEM Steels are still flat and look great. Barnet frictions still look good too. NOS set of springs still taller than spec. And adjustment is just the way it should be. Just won't won't hold.

This fly by night hack job works good
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