Quote Originally Posted by erik erikson
I will take the 4.5 stroke any day of the week to get a heavy bracket car to move.
In a marine application where the engine has to the rpm's for longer time frame I would prefer a shorter stroke.
A 1,000 + hp on a cast crank??
Why would you even try this???
At 600 hp I am looking for a forged crank.
EE,

I never said that I would "try this" with an offshore cast crankshaft, I said that a lot of racers are having such said experience. Why do you keep misinterpreting my posts? I already stated that it's a good thing that the overseas forgings have arrived realtive to such application(s).

And if you are saying that you are building bracket cars with 600HP motors that use the cast 4.5 stroke cranks, then that's great. I don't see a problem with that either. But if you are saying that you are having problems with the cast cranks above just 600HP and must then turn to a forged crankshaft, then I'd begin to question the integrity of the build(s) and the tune...although I have heard of a defective cast offshore crank snapping during a leisurely trip aboud the block during a 2000 rpm break-in...

Believe it or not, marine application race engines, including jet boats and v-drives, are going to larger stroker rotating assemblies and turning the engines slower...and finding greater ET's and traps speeds than with the shorter stroke peaky stuff of yesteryear.

Paul