D
Deleted member 12676
Guest
Someone just asked me if adding a reed valve will give a torque improvement over having an intake extension and I replied that without a torque pipe I doubt it would.
Let me illustrate:
Yesterday I took my bike for a spin with a standard exhaust on it. Power was OK but not impressive. Then I put on my torque pipe and the thing actually had a power rush about 2/3 of top speed (I thought it was going to wheelie) and was eye opening impressive from half speed all the way to the top. With my torque pipe it is actually a blast to ride. I like getting alongside a motorcycle and then gassing it and leaving it behind while the rider looks at me wide-eyed.
People need to understand that the pipes available to this engine can actually make you have less power at all rpm except top rpm because the strong baffle return wave, at lower rpm, pushes back the fuel mixture into the crankcase. Those pipes are designed for use only at top rpm. A pipe designed for torque increase, along with a reed valve, will increase power from about half speed to top speed. Without a reed valve it is greatly limited because the diffusers return suction wave has little effect on the closed off crankcase area. With a reed valve the suction pulls into the crankcase more fuel mixture from the carb, which then goes into the cylinder for more gas/air to burn, therefore causing more power.
Some people think that "power mods" will make them ride too fast and draw negative attention to them by law enforcement. Not so. With an expansion chamber you can set the top rpm by the header length. Longer causes less peak rpm and more down-low power. Once you have top speed set that way then you can enjoy more hill climbing power and better acceleration. Click onto my signature link to read more about the torque pipe and other power enhancing modifications.
Let me illustrate:
Yesterday I took my bike for a spin with a standard exhaust on it. Power was OK but not impressive. Then I put on my torque pipe and the thing actually had a power rush about 2/3 of top speed (I thought it was going to wheelie) and was eye opening impressive from half speed all the way to the top. With my torque pipe it is actually a blast to ride. I like getting alongside a motorcycle and then gassing it and leaving it behind while the rider looks at me wide-eyed.
People need to understand that the pipes available to this engine can actually make you have less power at all rpm except top rpm because the strong baffle return wave, at lower rpm, pushes back the fuel mixture into the crankcase. Those pipes are designed for use only at top rpm. A pipe designed for torque increase, along with a reed valve, will increase power from about half speed to top speed. Without a reed valve it is greatly limited because the diffusers return suction wave has little effect on the closed off crankcase area. With a reed valve the suction pulls into the crankcase more fuel mixture from the carb, which then goes into the cylinder for more gas/air to burn, therefore causing more power.
Some people think that "power mods" will make them ride too fast and draw negative attention to them by law enforcement. Not so. With an expansion chamber you can set the top rpm by the header length. Longer causes less peak rpm and more down-low power. Once you have top speed set that way then you can enjoy more hill climbing power and better acceleration. Click onto my signature link to read more about the torque pipe and other power enhancing modifications.