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Challenge accepted. I will approach this in a way any competent Lawyer would approach such an issue. By presenting expert testimony. Something that is universally accepted as evidence throughout the world. Now, as presented in post number three, Samson exhaust stated:
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AZrider is correct. The torque cones will help a lot with low to mid range performance. You need velocity in the exhaust as well as the right amount of back pressure to get best performance. The torque cones also give you an anti-reversion effect as well.
Thank you,
JR
Now, I present Samson exhaust as an expert witness as they are not only a site sponsor of these very forums, but a premier builder and seller of high performance exhaust systems for Harley Davidson motorcycles. I believe that qualifies them to testify as expert witness's in this proceeding.
I can also offer as evidence my own personal experience with torque cones, that mid range power was noticeably better when I installed them in my 1996 80 cubic inch Harley Davidson Low Rider with two inch drag pipes.
Don't mistake horsepower for torque, which is what I fear you are doing. You don't have to reach too far to determine that sticking a cork in the exhaust path might be harmful to redline horsepower ratings, but that sir is why they are called "torque cones", not horsepower cones. They work with the garden hose effect. Just like installing a nozzle on the end of a garden hose increases the waters velocity as it exists the hose, so does installing torque cone on a wide open exhaust. The improved exhaust velocity is essential in helping to create the lost low and midrange torque that open pipes create. Thats pretty much all I have...... defense rests.
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I won't try with the legalise but I will reply with a couple of thoughts...
Sampson are rather biased witnesses in this. They make some of the original dodgy exhausts that are the cause of the problem. They also make torque cones. Not that I really think the two guys here are fibbing, its just that I think the gains compared to what has already been lost mean that torque cones are pretty useless, they have said you only get a few torques back and that baffles are better. So why not just fit some ThunderMonster baffles for just about the same loudness and get more of the torqe and power back?
For my own witness I offer NRHS, the tuning specialists. These guys have no stake in this. Here's what they say about torque cones and back it up with dyno charts: http://www.nrhsperformance.com/tech_arcones.shtml
I had the same question. 2008 Ultra Classic 96 inch with Stage 1 big sucker Rinehart true duals 4 inch and just installed Zippers Red Shift 525 cams.I did put them in but will take them out if I should.
Still waiting for Harley (or ANYBODY in the exhaust business) to fabricate some pipes with movable butterfly valves, like on my 13 year old stock chevy. I would think THAT would be the best of both worlds.
A better solution is to fit a 'lollipop' in the exhaust end. A quick way to do that is to fit some Thunder Monster 'baffles'. You get all the noise still but the lollipop inside them breaks up the reversion.
I know its years later hope to get a response. Lol I got a bike that already had drag pipes. I pulled them of the cones where already there. Would it help if I put a lollipop and left the cones? Or would one or the other be best.
Still waiting for Harley (or ANYBODY in the exhaust business) to fabricate some pipes with movable butterfly valves...
Does anybody remember the name of those drilled plates we put in straight pipes back in the 50's and 60's with the **** on the side of the pipe to open them? I was trying to "google" them and found a guy in 2012 who thought he had come up with an original idea... The only thing different is no ****... I guess you have to stick your finger in and move it that way.
Does anybody remember the name of those drilled plates we put in straight pipes back in the 50's and 60's with the **** on the side of the pipe to open them? I was trying to "google" them and found a guy in 2012 who thought he had come up with an original idea... The only thing different is no ****... I guess you have to stick your finger in and move it that way.
Notice the spring... Tune the spring rate with an offset pivot and the valve would actuate based on exhaust pressure. Closed at idle and lower throttle opening. Open at high RPM. or throttle opening.
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