how strong?

[Qualitywires.com]

How strong is our Crank in the engine and also the forged pistons, rods?

How much can they handle? Does someone make a stronger crank?

 

[DChan415]

I wouldnt be worried about the engine if you're only planning to double power output without using any more RPM. I'd focus more on tuning and managing heat from the engine. The loads on the rotating assembly dont go up proportional to power output. But heat does.