RED wroteHallo guys,
.............
Engine is 900 crank case, st2 crank, 996 sps cams, pankl rods and optimized heads with 30/35 valves, injection 996 sps and p8.....
Hi Red,
That's looking pretty good mate. 😎
I'm also building a similar motor.
I've got new ST4 cases, 96mm topend/Pistal pistons 916SP barrels, 916SP heads with 35/30 valves, 996SPS style cams, a choice of either a 900SS crank (984cc) or a 916 crank (955cc) and a choice of either a new pair of Carilo's or some Ti' Pankls.
I've also got the carbon airbox/air runners, P8 and a choice of dual or single 54m injection systems etc.
'There's NO substitute for cubes!'
So I'd really like to use the 900 crank and build it as a 984cc, more power/torque both at lower revs.
I was going to modify the cross over shaft to clear the extra throw of the crank, but have been warned* not to do this as the shaft flexes even in standard form and modified ones tend to snap sooner rather than later. 😯
So here's my question...
What did you do about the lack of clearance, did you turn down the shaft or modify the rods to clear it?
I've been told it's better to mod' the rods, but the thought of grinding away a pair of brand new Carilo's or Ti' Pankls gives me the shivers.
Or find a cross over shaft from a 1098/1198RS as these will have the clearance without turning them down and are stronger, but they're as rare as Rocking Horse Shit and cost a small fortune if you can locate one.
*A Dutch tuner who builds big bore/stroked Desmoquatro's and Supermono's contacted me via another forum, saying that in almost every case when the crossover shaft had be turned/milled/ground down even when leaving a good radius at the change of diameter and polishing the mod'd area most had failed when used on the track, so he now modifies the rods.
Steve R
