Originally Posted by hsukaria

Even if you have 2 engines with the same max power, their torque peaks might be at different RPM ranges. I think a long stroke design will help achieve the torque peak at lower rpms, which is useful in trucks or 3D airplanes for vertical/hovering. Racing engines have short stroke and big bore engines to achieve power at higher rpms. Like you said, there are so many variables, including transmission gear ratios or propellers sizes for planes. It is all these variables that affect total performance.

Adding CDI may help reduce ambient environmental effects on engine behavior, but with the cost of added weight and complexity. It's fun to tinker with these engines, and a lot easier and cheaper to do it on a 1 c.i. engine instead of a 429 c.i. engine, right Cougar429?