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Discussion Starter #1 (Edited)
Want to get people's opinions on the optimum bore-stroke combos for jet and v-drives. I was under the impression that jets like more torque, so longer stroke ( maybe same stroke and bore) and v-drives bigger bore and less stroke for the higher rpms and a little less violent coming out of corners or initial drag start. Just trying to get a picture of what works best for each type of boat with a roots type blower. thanks
 

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Might want to post this in the Dyno section. Might get more play over there and if history is any indicator, a great pissn contest as welll :)sphss
I don't know anything about jets, but in a drag race application for a flat, you can make most any bore x stroke work. I run a blown alcohol 565 that makes buttloads of tq. Big gear and smaller diameter prop and it's happy. Motor never sees over 7400 RPM and runs a tic under 140 MPH. Took a while to figure out what the boat wanted with that combo, but it was worth it. Lots of guys like shorter strokes and/or to rev the snot out of the motors. I hear of blown combo's running good with 18's/22's but well over 8k RPM..
 

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This should be good for ten pages or more
 
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