58mm vs 59mm crank

[manden]

wich crank is strongest? some say 58mm and others say 59mm. one of them should break around 160 wheel hp. yoshimura only used the 58mm

[Gixer1460]

Dunno where that figure came from but mine (gsxr 1100L - 59mm) ran to well over 200+hp with no problems whatsoever. And I know of a std. but looked after Bandit crank that used to deal with 300+hp worth of nitrous power. I think excessive rpm's together with throttle on / throttle off, repeat, repeat repeat doesn't help. Thousands of these cranks have been raced - track and drag and breakages are thankfully fairly rare - rods are more vulnerable IMO. Yoshimura might have only used (58mm) to stay within class capacity limits?

[manden]

the 78mm with 58mm crank gave 1108.6 cc. ill stick with my 58mm untill i find a really beefy long throw crank that i can make work. im still drooling about 68mm throw if i can get barrels that will work up there. only real problem is casing mods and it is engine out for adjusting valves. but 1.4l to 1.55l engine is very tempting :)