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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 2011
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Macky1986 Macky1986 is offline
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Default 2" drag pipes with baffles

I put the krome werks baffles in my 1 3/4 drag pipes the other day and dont know if i like the way they sound....anyone out there running 2" drag pipes with baffles? Better flow with 2" pipes?
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Old 10th June 2011
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Two inch pipes will run much worse. Stay with the 1 3/4" pipes.
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Old 10th June 2011
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the smaller pipes will run much better. Only drag pipes I have seen run good were a set of 1 5/8" pipes I had on my 86 1100. Haven't seen any since. All I can find are 1 3/4
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Old 10th June 2011
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I've used the krome werks stuff and the sound is not very deep. the only way top get the deeper sound is to use a "resonance chamber" aka larger diameter muffler with limited baffling......

the cheap 4 inch baffles from JP sound good if you drill them through and cut them down a little...they thump a little but sound pretty good....if you do not drill them through they tend to fart
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Old 10th June 2011
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What exhaust system puts out the best performance?
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Old 10th June 2011
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I ran 2" for the looks, then picked up a set of cheap baffles. I cut the reduced section off the baffles, essentially leaving just the "cup" that would fit into the 2" pipes. I installed the cups approximately 3" up the tail of the drags. From that point, my restricted opening was about 7/8". I used a step bit (large) from there to slowly keep opening my center hole until I found the proper balance to run the pipes. The final size of the hole I had when I found optimum was 1 9/16". It took two sets of baffles to run this experiment, cutting them down to just restrictors. The first set was sacrificial, as I just kept opening them up 1/16" at a time and running them, until my performance got as good as it could get, followed by the slow decline as the hole became oversized for the exhaust flow. The second set I cut to the 1 9/16" unrestricted opening (where I found the best running condition). And ya, if you just run 2" drags with nothing, it will run like crap and sound like big wet farts in a wet paper bag. This is on a 91 1200 with S&S Super G, primarily stock motor. I had no running problems after this modification (over 50,000k since done), smooth, crisp power at all ranges. Your motor is different, so the same mod may not work, but the same principle may get you to a balance that works. For the record, I chose the 2" drags for the look, even 1 3/4" just looked too spindly for the look of the bike, then just did the guts to suit.
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Old 10th June 2011
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Macky, I should have said that I use the cheapo baffles to tune my drag pipes....a local drag bike builder showed me how he tuned exhausts for Harleys and in most cases, the optimum performance for drags is about 21 inches from the head port for the location of the lollipop or baffle.....

Someone had posted some dyno runs with various pipes.....I thought they all came out near the same....but I am old so who knows....
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Quote:
Originally Posted by Macky1986 View Post
What exhaust system puts out the best performance?
A good quality 2-into-1 will give you the best performance. I just don't like the looks. There are others here who can suggest a good sytem for you.
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Old 10th June 2011
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Quote:
Originally Posted by fergerburger View Post
Macky, I should have said that I use the cheapo baffles to tune my drag pipes....a local drag bike builder showed me how he tuned exhausts for Harleys and in most cases, the optimum performance for drags is about 21 inches from the head port for the location of the lollipop or baffle.....

Someone had posted some dyno runs with various pipes.....I thought they all came out near the same....but I am old so who knows....
+1 on that. I found in this particular mod that I did, at about 26" is where it worked for how I was set up.
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  #10  
Old 10th June 2011
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Looking at either these,
http://www.cycle-shack.com/cycle/ago...HD-112SD&xm=on

or ill just stay with the drag pipes, straight cuts or slash cut?? opinions?
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