- Location
- Central FL
If you look at the snowmobile engines of equal displacement they're getting the 200 plus hp out of their engines but @ 8200 rpm to 9000 rpm, and thats using twin pipe setups. So how are watercraft getting that number at 1000 rpm lower and on a single pipe? I've done some dyno testing and you can definately fudge the numbers but it doesn't do any good if your trying to make improvement. For a good engine its all about torque and responce, and that responce comes from a good package ie: pump, ignition, engine rev charactoristics. If your screaming for hp numbers than most likely you don't really know enough about the subject to understand what makes a good setup. I'll take a good setup over supposed peak power any day. Oh yea, its gotta be tuned right to even make it worth the effort, and if you think "just give me the jetting specs" is what tunning is, you need to pay some one to do it.
did you read any of this thread? i would only hope the guys who designed these motors would have an idea of how they should be tuned.