after a bit of confusion from a previous question. I would like some information about the R1 engine. I found this http://www.motorcyclenews.com/MCN/News/newsresults/videos/2009/February/feb1909-video-yamaha-r1-vs-honda-fireblade/
and it says "Short stroke" and this is the roadbike from which the superbike is evolved. and it mentions the uneven firing that I now associate with a screamer. Im getting confused with the Aprilia's V4 and its 90 degree angle- forward and up. is the Yamaha a straight or a V and is it a big bang or a screamer. or does it fall into a new catagory.
also is the M1 the same configuration. because im thinking back to not being able to put a superbike engine into a prototype frame and calling it a prototype. which makes me think the engine is different somehow. can anyone enlighten me on the specs ?
Thanks for the Video wiggysan
A screamer configuration has a totally even firing order ie 90-180-270-360 degrees on the crankshaft. As I understand it, the new R1 has what they call a "Long bang" firing order. This is achieved with a crankshaft at 270-180-90-180 degrees, which I believe is the same crossplane crankshaft of the M1. It's an inline 4 that gives power pulses closer (but not the same) as a V twin. They're allowed to put it into the WSBK because it's the same configuration in the latest production model that you or I could buy. A case of motogp technology filtering down to the street. Past R1's were always screamers. A screamer will always produce slightly more top end power, but will be more difficult to transmit that power through the rear tyre onto the road. The uneven firing order of a big or long bang gives more time for the tyre to regain some traction between power pulses. That's the theory anyway, and it seems to work. They're getting the best characteristics of a V twin and a straight 4. Short stroke has nothing to do with firing order. It just means the piston doesn't travel as far up and down the cylinder. Shorter stroke engines tend to be able to rev higher but with less torque than a longer stroke. They just need to find a happy medium.
Ironically the Ducati GP9 (and GP8 before it.....They reverted to a screamer with the advent of the 800's) is a V4 with a screamer configuration (even firing order). Maybe that's why its such a handful that only Stoner seems to be able to get his head around.
Hope that helps.
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