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bob27s -> RE: Jett muffler for Magnum 52? (5/25/2007 3:43:54 PM)
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A full pipe will almost always give you more power boost. Not a great deal more, probably another 200-300 rpm on average. Their advantage is you can tune for a specific rpm and torque curve. Set the pipe shorter for more rpm with smaller props, or longer and turn bigger props slower (up to a point). The Jett mufflers are fixed geometry with a know rpm range... you select props that match the engine rpm to that range.
Disadvantage of a full pipe is you have to tune the system to match the application.
Chances are if the header and pipe were already cut to length and setup for the YS45. Just bolt it on, and start with a 10x6 prop. See how the engine behaves and the measure what rpm it turns. Then go up one prop size, and down one prop size. See how the engine behaves.
For existing pipe systems or the pre-tuned systems, I usually recommend prop selection for tuning - just like with the jett muffler.
Example - If you go up a prop size, and the engine holds similar rpm and behaves/needles/transitions well - the pipe was set "too long" for the 10x6. In which case, leave it set there and run the bigger prop - or another prop that turns the same rpm. If you find the engine struggles, is tempermental, then the bigger prop is too much load, the engine cant get on the pipe properly - pipe is considered too short. In which case, you drop back a prop size.
Bob
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