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Necessary Always Active. Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies. Torque cones may seem like an unnecessary extra, but the truth is that there are many reasons to consider adding them to your Harley-Davidson motorcycle.
Before the exhaust valve closes, exhaust gasses can be pulled back into the engine, which can contaminate the fuel and lead to further complications. Here are a few great benefits to having torque cones on your motorcycle. As mentioned above, torque cones work to prevent exhaust gasses from getting pulled back into the engine, which sometimes occurs while the exhaust valve is closing and the pistons are descending.
This can be hugely problematic because dirty exhaust gasses will contaminate fuel and oxygen, which means less power and lower idle quality. Torque cones can help to prevent that. Just have an adjustable wrench on hand.
I guess it probably helped a little, but nothing spectacular. They're cheap, though, so it really doesn't hurt anything. This debate can rage on forever, kinda like the "What oil is best" sort of thread. Everyone has opinions and then generally someone who really does understand the physics behind it will pipe up with a bunch of formulas that the average Joe won't read or comprehend anyway.
So it's kinda pointless to pitch in but I will anyway. I used them on an evo sporty a couple years ago. I built a high and very short 2-into1 pipe set up. It ran fine, maybe lost a little on the top end but nothing major. The backfiring on decelleration bugged me though. I put a baffle in it and hated the sound and performance didn't seem to change much if any, as recorded by the Levi's dyno.
I put the torque cones in and the backfiring stopped, so I kept them. I couldn't tell any significant change other than that. I would note that your stock exhaust studs may not be long enough to accept them.
Mine weren't and I had to swap them out for longer versions. Just my experience. Last edited by billdozer; at AM. He wildcard, take a break man. Here's a cool article I dug up a while back.
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