cr0ft
Living Legend
I won't lie, if there were a V-Twin platform that could deliver the power of a rocket, with similar tuning headroom and handling, I'd be all over that ****. I love the sound of big bore v-twins, especially built ones with hot cams.
Air cooling alone means you have a very hard time building anything like that. It's so much less efficient than water cooling that the engines have to be built powerless. And if you're actually trying to meet strict emissions standards also, yeah, good luck with that one.
First time I heard that Harleys have to shut down the rear cylinder in stop-go to avoid it melting into a metal puddle in the street I just went "no effing way" but apparently it's true.
But yeah, the Rocket motor is basically not tuned at all at 140 horses. By the time you blow $15 grand on HD parts for performance, you can blow $10 grand on the Rocket and have 150 hp *more* than the resulting Harley...