I'd like some information about increasing rod length in a destroked motor. In theory the longer rod will make more torque, and will decrease wear at high RPM operation, which clearly is the goal of destroking a motor.

Assuming that you're already having a custom crank made to destroke a setup, in theory would you not also want to have custom rods made at a considerably longer length, to allow for both high compression ratio, and a R/S ratio given to producing wicked torque?

I understand how all that stuff works in a predefined context, I'm just newly exploring the idea of building a unique, fun motor.

Any guidance is appreciated

The theorectical optium for a cylinder displacement is 500cc why the best 6 cylinders are 3 liter.

A longer rod will not make more torque. The idea behind a longer rod is to reduce peak piston acceleration, allowing higher RPM, and a reduction of piston skirt loading.

Reducing the stroke will reduce torque output since it reduces the displacement of the motor.

Quote, originally posted by Still_Good »

Assuming that you're already having a custom crank made to destroke a setup, in theory would you not also want to have custom rods made at a considerably longer length, to allow for both high compression ratio, and a R/S ratio given to producing wicked torque?

There is no theory involved. You shorten the crank stroke, then you must increase the rod by the same amount. Otherwise the piston will travel up X amount less, yielding a 5:1 compression ratio.

If you want to rev to oblivion then you can sneak the wrist pin up on the custom piston and elongate the rod further.

Destroking is for producing high RPM power, period. You will not make "wicked torque", you will simply hold onto the torque the motor produces for longer, provided the rest of the engine is built to supplement that.