Stupid suggestion: New camshafts to have cyls fire together?

[Nessism]

Might want to read up on the new Yamaha R1. Their solution works and while I haven't heard one run myself those that have are impressed with the sound. I think Mr. Rossi is impressed with the performance. Involves a staggered crank, I doubt the technology is backward compatible.

The new R1 and those motoGP bikes don't fire the cylinders in pairs like being discussed here. Those bikes use a special crankshaft, to go with the camshafts, and stagger the firing order in a special way. Check this video for more info... http://www.youtube.com/watch?v=UvTXM...layer_embedded

The main advantage to this type of engine is to optimize traction in big HP applications, or where traction is limited. Seems like a silly idea for a GS bike unless maybe for ice racing.

[Skyboy8950]

Just to clarify: I don't plan to do it. I just thought it was an interesting idea I had (an apparently others have had it too).

Thanks, good discussion.

[isleoman]

Just to clarify: I don't plan to do it. I just thought it was an interesting idea I had (an apparently others have had it too).

Thanks, good discussion.

Skyboy, I for one understood that this was a discussion of possibilities.

So Please don't try to put that R1 crank in your bike.

[Skyboy8950]

Crap. Too late. Why won't my engine run now? NOOOOOO!

[p_s]

The new R1 and those motoGP bikes don't fire the cylinders in pairs like being discussed here. Those bikes use a special crankshaft, to go with the camshafts, and stagger the firing order in a special way.

A good explanation of those crazy cranks: http://www.ashonbikes.com/cross-plane_crank

[850 Combat]

Having 2 cycinders fire at the same time would be harder on the transmission and primary due to having twice the torque hitting it half as often.

[donimo]

I wanna do it and have a thumper, just have to cut the crank and weld it back together, maybe with solder to save a few bux.

[Agemax]

Having 2 cycinders fire at the same time would be harder on the transmission and primary due to having twice the torque hitting it half as often.

on a standard gs1000 for instance, would it not just turn it into a 1000cc twin, but with the load spread over a 4 cylinder crank rather than a twin?

[Skyboy8950]

Crap, I just cut my cams and welded them back together and it won't run. Can someone help?

[hillsy]

on a standard gs1000 for instance, would it not just turn it into a 1000cc twin, but with the load spread over a 4 cylinder crank rather than a twin?

Your standard in line 4cyl crankcase is not designed to have 2 cylinders firing at the same time, so the end result would be reduced reliability.....and probably double the vibration of a parallel twin

Ducati tried something similar with their first gen GP engine (they had a V4 with each bank of cyls firing together) but they found it destroyed the bottom ends quite rapidly - they then went to a conventional V4 firing order (and have been quite competitive ).