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48SPL Stops Making MPH Before It Stops Making RPM
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<blockquote data-quote="tinskin" data-source="post: 457213" data-attributes="member: 24031"><p>I don't know why you are yelling at me, but I do understand rpm's do determine pitch, but there is no higher pitch prop that I can find. One would think though that as long as the motor is gaining rpm the speed should also increase. Now if the carbs I have now are from a more free flowing leg (the jet size is much bigger on these) maybe I have exhaust restriction, maybe I have cavitation, is there a way to tell? The sensation is like floating the valves on an old v8 car when you wait too long to shift, the tach keeps going, the speedo not so much. I also wonder do reeds float? On the other boats with trim if I go too high and vent the prop those last rpms jump up real quick, this one has a linear climb. I have been using 5600 rpm as max, my other 2 cylinder lists a range 5000 to 6000 with max hp @5500. I don't know where I got 5600, there is a non rev limited power pack available though. What height should the cavitation plate be above / below the hull bottom? Now I am about an inch above.</p></blockquote><p></p>
[QUOTE="tinskin, post: 457213, member: 24031"] I don't know why you are yelling at me, but I do understand rpm's do determine pitch, but there is no higher pitch prop that I can find. One would think though that as long as the motor is gaining rpm the speed should also increase. Now if the carbs I have now are from a more free flowing leg (the jet size is much bigger on these) maybe I have exhaust restriction, maybe I have cavitation, is there a way to tell? The sensation is like floating the valves on an old v8 car when you wait too long to shift, the tach keeps going, the speedo not so much. I also wonder do reeds float? On the other boats with trim if I go too high and vent the prop those last rpms jump up real quick, this one has a linear climb. I have been using 5600 rpm as max, my other 2 cylinder lists a range 5000 to 6000 with max hp @5500. I don't know where I got 5600, there is a non rev limited power pack available though. What height should the cavitation plate be above / below the hull bottom? Now I am about an inch above. [/QUOTE]
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48SPL Stops Making MPH Before It Stops Making RPM
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