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Interesting. I assume that increases the stroke, and therefore the displacement somewhat. I can't find bore and stroke numbers on the traxxas engines or I'd figure out by how much. Just for the sake of discussion, could one swap a 2.5 crank into a 3.3 to derate it slightly?

The 2.5 is a .15 and the 3.3 is a .20, the .19T should be just about as powerful as the 3.3. The most important factor affecting top speed and low-end torque is gearing. Speed-run vehicles that are hitting the top speeds achievable with their platform, be it electric or nitro, are thoroughbreds...

In very rough terms, yes. It may not raise the top speed because the engine will have a similar max RPM. It should accelerate more powerfully. It'll produce a bit more power assuming the tune, glow plug, and compression are all compatible with a higher nitro %%. For sport engines like the .19T...