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Go down 1 number in pitch.What is the recommendation for best speed on a 2075 w/ 90hp Yamaha? The Marina provided a prop that acheives 22mph at 6000 rpm. I would like to bring down the revs and hopefully increase speed. Ultimately get the engine in the 5500-5600 range.
You know, upon re-reading, I realized I goofed up.If you want to decrease wot rpms you will need to increase pitch. Example: if your running a 15 pitch, going to a 17 pitch of the same brand/model of prop will normally decrease your WOT 400rpm.
You know, upon re-reading, I realized I goofed up.
I thought you were IN the 55-5600 rpm range and wanted to get the right prop for max speed, which would be one that would bring you to your (presumed) 6,000rpm top engine speed.
Fyrfighter is correct, but now that I have re-read it, your post begs the question; why do you want to decrease engine speed?
I was wondering if I switced to a higher pitched prop to drop the RPM's down would that help my top speed. When I am running wot it seems like I have some cavitation. I checked the mounting and the motor is in the second hole from top. Thank's for any thoughts and input.You're in the ballpark.
I had a slipmate with a boat identical to mine, except he had a 90 Yam and I had a 50 Yam.
We tested both boats on the same day, with the same GPS and did it at the beginning of the season (2008).
I hit 18, he hit 23.
Your boat has 25 more horse, and extra foot in length and was carrying more weight. Hitting the same 23 means you're in the ballpark.
Thank's for your help. Does moving the motor that little bit make that big of difference? Does running the motor at the high end of RPM range hurt it? Changing the prop would not substitute for dropping the motor? Once again thank's.What you are having is ventilation ( cavitation is rare in pontoons ). Moving your motor down should take care of it, getting you more bite in clean water.
Well, you're not lugging it, but you're leaving almost 1,000rpm on the table.I've got a 2050FSI with a 90 Yamaha. At WOT I'm only turning 5100 RPM. Am I lugging the motor? I average about 2.3 gph when pulling a tube so I'm kind of reluctant to change anything. I get the 5100 whether I'm by myself or I've got my wife in the boat and 2 teens on the tube. Yamaha says I should be in the 4-5 gph at those reps. I lose about 300 rpm when I get more people on and try to pull. Do I really need to get closer to the 5500-5600 range to be easier on the motor or am I OK where I'm at? I'll check size/pitch later. I looked but forgot to right it down the other day.
I realize that, but what am i going to use fuel wise with another 500rpm? Yamaha says I should use 5-6gph at 5500. I'd love the extra speed and power but at $4+/gal I'm kind of afraid to spend the money on a new prop. If I knew that my fuel rates would stay within a gal/hr of what I was getting now I'd switch in a heartbeat.Well, you're not lugging it, but you're leaving almost 1,000rpm on the table.
Ideally, you want the full forward position of the throttle to correspond with the maximum RPM.
You can still set the throttle where you want it. The reason you're 900rpm down is because you've got too much prop. It's like being in shape to bench press 200lbs and someone slips on a couple of extra plates.I realize that, but what am i going to use fuel wise with another 500rpm?