KM, is that 5-8 hp relatively constant for a wide range of engine displacement/power rating? Say for the vn750 up to a 1600 cc engine.There are several advantages to chain drives.... They weigh less, they transmit engine power more efficiently (shafts waste 5-8 hp)
I'm curious too. Some horsepower ratiings mention "at the rear wheel". It certainly would be a bummer to find that the 65 hp is whittled away by the shaft's inefficient transfer of power and thus not realistic . I can't imagine it being as much as 30% with our bikes though since they'll keep up with bigger bikes and even out perform someKM, is that 5-8 hp relatively constant for a wide range of engine displacement/power rating? Say for the vn750 up to a 1600 cc engine.
I don`t know if it is true, but I have heard numbers as high as a 30% drop in HP for a shaft drive bike over a chain.
I think the vn750 is rated at 65hp, so a 30% loss at the wheel would be almost 20hp. :wow:
What do you think about the 30% loss of power claim?
Thanks for the info and I appreciate and respect your knowledge. I have to disagree with the statement about losing power by the ear shave. It simply isn't true when done correctly. I can tell you honestly that my bike performs much better with unrestricted air intake and larger jets. This is just logical and they use even bigger jets for racing. My front wheel almost hydroplanes at WOT from standstill and it didn't do that before. I haven't done any major mods otherwise and except for the pickup tolerance mod, I don't plan to change anything regarding my exhaust or degoating (I think the belly is there for exhaust balance and back pressure and I do agree it seems plausible that you could lose some performance by removing it). That said, you certainly know quite a bit about engines, performance and mechanics in general so thanks for sharing your knowledge. I also agree that the VN is a weird egg, . I like it a lot but yeah, it's strange that they put all that technology into an engine and didn't go with belt or chain to use it's full potential AND, as I've said before, capped it's top end with only a 5 speed tranny.As for earshaves, degoating, aftermarket pipes, it is my opinion that not only do you not gain any power by doing these things, you actually lose some. What you gain is noise.