Is Vito's the only one who makes a +3 Blaster crank? I've found +4 cranks from other manufacturers but only Vito's for the +3.
+3 crank options
- Thread starter dksix
- Start date
The vito's is the only +3mm option. The +3mm crank has a slightly thinner main bearing cap to allow the stroker crank to rotate inside of the stock crankcase without contacting.
The hotrods +4mm stroker crank requires that the cases be "trenched" or have the center mating section thinned down. When you remove the amount of material to clearance the crank, you've actually removed more material from the two thin spots in the case than there is material LEFT after the removal. The area between the crank case and the balancer shaft and the crankcase and input shaft (transmission side) are particularly thin.
Basically, I would consider the +3mm for a "normal" blaster engine (trail, mild strip, or even at the drag strip/mx track/xc track) and a +4mm for an all out dragger blaster build.
The hotrods +4mm stroker crank requires that the cases be "trenched" or have the center mating section thinned down. When you remove the amount of material to clearance the crank, you've actually removed more material from the two thin spots in the case than there is material LEFT after the removal. The area between the crank case and the balancer shaft and the crankcase and input shaft (transmission side) are particularly thin.
Basically, I would consider the +3mm for a "normal" blaster engine (trail, mild strip, or even at the drag strip/mx track/xc track) and a +4mm for an all out dragger blaster build.
I guess I'll skip the longer stroke if my only options are Vito's or thinning my cases. Just so I'm sure, a +4 crank would move the piston pin 2mm farther from center making the stroke 2mm lower and 2mm higher. Is/was there any +2 cranks made?
