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busa H2
JoelP - 8/5/09 at 08:42 PM

read on the DP website that John Hartley has made a busa engine with a flywheel, billet crank case, and a dry sump built in, to mate to a 'proper' gearbox. Quite an achievement!

Its under the 'etc' section, though the rest is worth reading if you have a few weeks spare!

StevieB - 8/5/09 at 09:43 PM

I'd seen that and thought it was a great idea at first.

The problem is that the weight advantage of a bike engine lis in the fact that the gearbox is small, light and integral to the engine. If you take that away and add in the flywheel etc. and strap on a type 9 gearbox, you might as well have just put a duratec in and tuned it a bit.

A1 - 8/5/09 at 10:59 PM

also the sequentialness is awesome...and the bit first/2nd gear clunks

blakep82 - 9/5/09 at 12:24 AM

well, you still get 18k revs or whatever, gearbox will be stronger, you could still have a sequential box, and you get proper reverse too.

sounds alright to me

Daimo_45 - 9/5/09 at 01:17 AM

quote:

well, you still get 18k revs or whatever, gearbox will be stronger, you could still have a sequential box, and you get proper reverse too. sounds alright to me


But for about 15 times the price of the aforementioned Duratec.

StevieB - 9/5/09 at 08:10 AM

quote:
Originally posted by blakep82
well, you still get 18k revs or whatever, gearbox will be stronger, you could still have a sequential box, and you get proper reverse too.

sounds alright to me


There's nothing weak about bike gearboxes, it's just that you can't lean on them under engine beaking like you can with cars, which is where the concept of them being weak comes from. It;s not the gearbox that's the problem, it;s the driver who needs to learn a different way of driving is all.

PS - What's the betting that the sort of person who could afford to have this engine would then splash out on a 6 speed possibly sequential gearbox?

[Edited on 9/5/09 by StevieB]