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  #1  
Old 1 Week Ago
Trapshooter Trapshooter is offline
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Default Exhaust question

I have drag pipes on my ‘81 because that’s what it had when I bought it. I’m trying to revive it after a 12 or 13 year hibernation. My question is; are baffles enough to alleviate the loss of torque in the low and mid ranges or should I install torque cones as well? I don’t have the finances to purchase new exhaust or mufflers right now.
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Why do anything with the pipes until you have it running? You may find it runs just fine as is. If you find the performance unacceptable there may be other things you can do to dial it in better. Have you overhauled the carb?
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Quote:
Originally Posted by Trapshooter View Post
I have drag pipes on my ‘81 because that’s what it had when I bought it. I’m trying to revive it after a 12 or 13 year hibernation. My question is; are baffles enough to alleviate the loss of torque in the low and mid ranges or should I install torque cones as well? I don’t have the finances to purchase new exhaust or mufflers right now.
I recommend 2/1 pipes....you pick up a good bit of torque in the midrange
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Eye bolt in about four inches.
Lollipop is the cheapest ways.
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Just run it like it is until you can afford some mufflers.
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Quote:
Originally Posted by RicThompson View Post
Why do anything with the pipes until you have it running? You may find it runs just fine as is. If you find the performance unacceptable there may be other things you can do to dial it in better. Have you overhauled the carb?
Yes. I have put a rebuild kit in the S&S Super E carb
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Quote:
Originally Posted by rejeanprimeau View Post
Eye bolt in about four inches.
Lollipop is the cheapest ways.
Least expensive, reasonably effective way to lessen the torque dip. Torque cones have been pretty much proven to be a waste of $$ & time.
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There's 3 good threads in the exhaust section of the IH Technical Sticky that may answer some of your question: http://xlforum.net/forums/showthread.php?t=465866
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I made up anti-reversion cones (from old muffler parts) that proved quite effective for my 1200 EVO XL (AP V8 cams, Crane box, Branch big valves and ported, Mikuni HS40).
They were different from what you can buy in that they were longer with shallower taper, and (most important) Jerry Branch gave me a diagram showing how small the end ID should be.
1-1/8".
How can that work? The exhaust gas speed and pressure at the port is so high that a large opening isn't needed.
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Since an Ironhead has slip fit exhaust connection, installing A/R cones is going to be problematic.

Those are made for EVOs not Ironheads.
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