Westech
CPL
- 6,104
- 208
- 63
- Location
- cow farts, Wisconsin
When I have blown engines it has been at higher RPM and I have ALWAYS tossed a rod. I have never broken a crank at high RPMS only braking connecting rods.
I am thinking that lugging the engine would place WAY more stress on the crank then a high load and high RPMS.
When lugging the piston that fires is trying to push the crank around faster then it can move... IE a over pressure event.
It seams that the balancer may be a issue along with poor castings of the crank.
maintenance (oil changes coolant ect) will not have much effect on crank failures. Poor maintenance will cause bearing failures before a crank brake apart.
When a rod or main bearing fails you will hear it/feel it. it take a considerable amount of time after a bearing fails to cause catastrophic crank failure.
I am thinking that lugging the engine would place WAY more stress on the crank then a high load and high RPMS.
When lugging the piston that fires is trying to push the crank around faster then it can move... IE a over pressure event.
It seams that the balancer may be a issue along with poor castings of the crank.
maintenance (oil changes coolant ect) will not have much effect on crank failures. Poor maintenance will cause bearing failures before a crank brake apart.
When a rod or main bearing fails you will hear it/feel it. it take a considerable amount of time after a bearing fails to cause catastrophic crank failure.