torque cones ? do they work ?
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Ain't no substitute for a proper exhaust system! Cones seem to me born out of the desire from some riders to use unsuitable exhausts systems. I have a Supermeg 2-into-1 which has a bit empty outlet into the muffler, so the pipes are fine, but the muffler does have baffles. If you have an empty muffler, try a Bubs baffle in it, if they make such a thing.
Road Master
Joined: Nov 2012
Posts: 794
Likes: 1
From: Alvin TX
interesting replies
the theory of anti reversion does sound good and the only person I know who has tried them was very impressed
running a 2 into 1 with a bubs silencer (if you can call it that its very open)
not interested in either sound or noise, just want better mid range power
the theory of anti reversion does sound good and the only person I know who has tried them was very impressed
running a 2 into 1 with a bubs silencer (if you can call it that its very open)
not interested in either sound or noise, just want better mid range power
Thread Starter
|
Tourer
Joined: Jun 2013
Posts: 272
Likes: 5
From: pomgolia
bike is 86FLHT
headers are standard hd electraglide with left side cross over removed from rear pipe and plate welded over resultant hole
muffler is bubs bad dresser, its straight through with fibreglass baffling around a perforated core
headers are standard hd electraglide with left side cross over removed from rear pipe and plate welded over resultant hole
muffler is bubs bad dresser, its straight through with fibreglass baffling around a perforated core
Road Master
Joined: Aug 2006
Posts: 1,148
Likes: 157
From: Banning, CA
Torque cones were born back in the day when some folk thought running straight
pipes with no baffles was cool. Guys that I knew said seat of the pants told them
low and midrange torque did improve some while letting their pipes, particularly
fishtails, pop real good during decel. Never heard that torque cones ever did
anything more than that.
pipes with no baffles was cool. Guys that I knew said seat of the pants told them
low and midrange torque did improve some while letting their pipes, particularly
fishtails, pop real good during decel. Never heard that torque cones ever did
anything more than that.
Ultimate HDF Member
Joined: May 2006
Posts: 6,590
Likes: 444
From: Ohio
No need for the cones, they are for drag pipes if they make a difference at all.
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
We've had a few people put them in and it seemed to shorten the life of the exhaust valve. Think about in, the exhaust valve gets really hot with an open exhaust, so let's put sone restriction right at the header flange to keep even more heat on the valve, valve seat and the head surrounding the exhaust port!!!!! Doesn't make a lot of sense to put a free flowing exhaust on and then restrict right at the port!!!!! Plus I have seen a few fail and rattle around in the pipe. Just my two cents worth!!!
John
John
Seasoned HDF Member
Joined: Sep 2012
Posts: 6,570
Likes: 590
From: almost there
We've had a few people put them in and it seemed to shorten the life of the exhaust valve. Think about in, the exhaust valve gets really hot with an open exhaust, so let's put sone restriction right at the header flange to keep even more heat on the valve, valve seat and the head surrounding the exhaust port!!!!! Doesn't make a lot of sense to put a free flowing exhaust on and then restrict right at the port!!!!! Plus I have seen a few fail and rattle around in the pipe. Just my two cents worth!!!
John
John
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
My 2 cents worth / because we chased this
exhaust tuning is a math project - it has to do with the speed of sound and the negative wave that develops when the exhaust valve closes on the valve seat, and that sound travels at the speed of sound down the exhaust pipe
the size of the pipes is in a direct relationship to the exhaust valve size / the shape and length of the port in the head, and the overal length of the pipe < the negative wave is UN seen but it stops and starts at a location, that location IF found ( extensive Dyno work months and months every day ) can increase the exhaust track tuning / VIA the intake track tuning < ( another bute ) and that has its relationship with the Overlap in the camshaft numbers
i am trying to make it simple so i will say this
the negative wave travels at the speed of sound down the length of exhaust pipe
( like seeing a car crash 3 blocks away / than you hear it )
at the spot the wave stops is the exact spot ( if you find it ) you want the total length of the pipe to be lets say 29 inches cut at 90 degrees to the end // Because the the start and stop of the negative - shock wave creates the greatest suction on the exhaust valve if the pipe cut off is in the correct spot --
we have on a dyno found moving a muffler 1 inch shorter or longer created 5 or 6 more Usable HP -- for a street bike this is all for nothing as you are in an RPM range that is always changing in the low end of the motor - drag or road racing motors are Max effort, and these things can be adjusted and give the unit more available power in the RPM range you are using --
and yes as a kid knowing nothing but riding a bike and living on its seat the lollypop washer welded to a bolt in a set of drag pipes took the flat spot out SORT of - hahahahhahaha - johnjzjz
exhaust tuning is a math project - it has to do with the speed of sound and the negative wave that develops when the exhaust valve closes on the valve seat, and that sound travels at the speed of sound down the exhaust pipe
the size of the pipes is in a direct relationship to the exhaust valve size / the shape and length of the port in the head, and the overal length of the pipe < the negative wave is UN seen but it stops and starts at a location, that location IF found ( extensive Dyno work months and months every day ) can increase the exhaust track tuning / VIA the intake track tuning < ( another bute ) and that has its relationship with the Overlap in the camshaft numbers
i am trying to make it simple so i will say this
the negative wave travels at the speed of sound down the length of exhaust pipe
( like seeing a car crash 3 blocks away / than you hear it )
at the spot the wave stops is the exact spot ( if you find it ) you want the total length of the pipe to be lets say 29 inches cut at 90 degrees to the end // Because the the start and stop of the negative - shock wave creates the greatest suction on the exhaust valve if the pipe cut off is in the correct spot --
we have on a dyno found moving a muffler 1 inch shorter or longer created 5 or 6 more Usable HP -- for a street bike this is all for nothing as you are in an RPM range that is always changing in the low end of the motor - drag or road racing motors are Max effort, and these things can be adjusted and give the unit more available power in the RPM range you are using --
and yes as a kid knowing nothing but riding a bike and living on its seat the lollypop washer welded to a bolt in a set of drag pipes took the flat spot out SORT of - hahahahhahaha - johnjzjz
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
Advanced
Joined: Oct 2009
Posts: 54
Likes: 0
From: Hastings Nebraska
There's some good information on this site. I read this just last night...
http://www.nrhsperformance.com/tech_arcones.shtml
http://www.nrhsperformance.com/tech_arcones.shtml
Thread
Thread Starter
Forum
Replies
Last Post