What's the intended use? The only application I can think of where an engine would run at constant full throttle would be a marine engine, and those have to be built with the same porecision and attention to detail as race engines. (Blueprinted, balanced, and heavy-duty parts) A constant-speed application like a water pump drive or a generator, etc. will have a governed speed well below full throttle, somewhere near the torque peak. Definitely DO NOT use lightweight rods such as aluminum for marine or round track applications.
Jerry
