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I've seen this idea before, never got far though. I think it has good merits, simple design, easy to implement. But I don't worry about the belt. If they can make a belt designed to handle 250hp (CVT on Audi's) then the 5hp assist you want should be fine. I'll even bet you could put a 3-5hp motor on there, and get a high quality stock AC belt to match. Simple, no trying to find the right size or mess with the crank pulley (v-belt vs. ribbed).
@ iHero: Looks like your friend bolted a pulley to the crank pulley, since its a serpentine belt setup stock. Curious if there are detailed pictures of that install.
Another random thought I haven't read above: rpms. what range do you want it to be active, the whole engine's range or just a small range? A small range makes for a cheaper motor and you can use pulley sizes to adjust the TQ to the ICE.
hm. Now I want to do this on my GP, just go find the supercharged 3.8 pulley parts and use them.
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