Torque Cones??
Thread Starter
|
Road Warrior
Joined: Feb 2009
Posts: 1,519
Likes: 2
From: St. Augustine Florida
Torque Cones??
Part Number: 441-729 in 09 JP Cycle Catalog page 219.
$34.99 sold in pairs.
"These high temperature steel cones have fully radiused edges for a greater imporvement in engine responsiveness, especially at low end torque. They offer correct back pressure for more horsepower".
I have never heard of these and just curious as to their function. Does anyone use these? Would they require a different map? Do they work? or just another BS wannabe or impractical modification?
Thanks and ride safe!
Seasoned HDF Member
Joined: Oct 2007
Posts: 56,052
Likes: 88,364
From: Western South Dakota
I had em' in my samson short slashers, and they make your straight pipes sound more "tinny". Didn't like em', They are too restrictive for flow IMO.
You will get more from Thundermonster baffles from BCT, or at least I did.
You will get more from Thundermonster baffles from BCT, or at least I did.
Ultimate HDF Member
Joined: May 2006
Posts: 6,590
Likes: 444
From: Ohio
Trending Topics
Extreme HDF Member
Joined: Sep 2006
Posts: 10,033
Likes: 29
Save your money. They go in the wrong end of the pipe to do any good.....Think about it...Even HD sells thinner SE gaskets not to inhibit the flow of the exhaust outta the head. Power chasing guys look for ways to get the exhaust flowing and out of the head. The last thing they want to do is restrict the flow at the exhaust port....If you are looking for back pressure to increase bottom end, you would be better off with a bolt, lollipop baffle, or even shorty baffle in the other end of your pipe.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Grand HDF Member
Joined: Sep 2007
Posts: 4,112
Likes: 40
From: Boise Idaho
They stop the pulses that try and come back up the exhaust pipe and reenter the head, this pulse is very strong on pipes that are to big for a particular engine or drag pipes.
The old twin cams didn't need them because Harley had a big old step in the exhaust port that would have definatly slowed that pulse down, but the 96" Twin Cams don't have that step in the port anymore.
I have a set of heads that I had worked over for one of my Spotsters by Head Quarters and they send a set of those cones alone and want them used no matter what kind if exhaust you have, I would guess they are using them to excelerate the exhaust flow out of the combustion chamber and add to the scavenging effect.
The old twin cams didn't need them because Harley had a big old step in the exhaust port that would have definatly slowed that pulse down, but the 96" Twin Cams don't have that step in the port anymore.
I have a set of heads that I had worked over for one of my Spotsters by Head Quarters and they send a set of those cones alone and want them used no matter what kind if exhaust you have, I would guess they are using them to excelerate the exhaust flow out of the combustion chamber and add to the scavenging effect.
Thread
Thread Starter
Forum
Replies
Last Post
