Super-Short stroke crank

[Chipwizard]

Has anyone had a super short-stroke crank made? I'm looking at 45.6mm to make 940cc in order to run supercharged in a 1600cc class (with a 1.7 factor for boost)
The reason I'd like to stay with the 'busa, rather than going for a Gixxer (or similar) as a base motor, is for the stronger tranny and general robustness, I already have 'busa engine as a base, dry sump system etc etc.
Plus, with stock pistons in a GenII running the same deck clearance I'd end up with 9.07:1 CR, which should be about where I'd like to be.
Also, what issues have people had with valve trains and cam chain running very high rpms?

Any thoughts?

 

[Jay]

It would have to be a custom made billet. You can not move the journal that far with a weld up because it would put the oil hole way too far off center.

 

[Chipwizard]

Of course. I wouldn't trust a welded crank at 16k anyway, would you?

 

[busa2001]

Not sure about everyone else, but the highest i rev the busa was 12.4k with no issues to date...i did up grade the valve train though....

 

[Jay]

Of course. I wouldn't trust a welded crank at 16k anyway, would you?

Why would you spin a supercharged motor that high?

 

[ogre]

why not, lol.

 

[Jay]

Because it is not necessary to make power with a blower

 

[Chipwizard]

With only 940cc you would have to rev it high to get the power, even with a blower.

More boost is not the efficient answer to more power.

 

[Chipwizard]

.....i did up grade the valve train though....

What did you find you needed to do? Were there any issues with the cam chain and associated parts?

Thanks in advance... :-)