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Posts: 133
Location: South Bend, Indiana | I recently got my new boat, a 20ft ranger bass boat, with a 225. I've noticed that when going into a turn (once on plane), that the engine revs up, and loses speed. It also happens when I'm going about 30mph, and then give it some throttle to get moving. It has revved up to about 5500 rpm on my once, when only running about 3200 rpm prior.... It's almost as if the prop is coming out of the water. Maybe I'm not trimming it correctly? I thought about putting on a hydrofoil... any suggestions? |
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Posts: 13688
Location: minocqua, wi. | you definitely don't need a hydrofoil on a 225hp ob motor.
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Posts: 358
Location: London, England | Prop's ventilating. Trim down a bit when you go into the turn, then trim it back up as you straighten out. |
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Posts: 133
Location: South Bend, Indiana | You see, I've tried that.... I've had it ALL the way down a couple times while turning, and it still makes the rpm needle jump... gotta prevent it before it gets to damaging my evinrude... |
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Posts: 358
Location: London, England | The wrong type of prop for your boat? Damaged prop causing ventilation? Slipping hub?
Has it ever run right? If it's never run right I'd talk to a knowledgeable prop shop to make sure you've got the right prop for your boat. Try Ricky at Brainard props. http://brainerdprops.com/ |
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Posts: 432
Location: mpls | Slipping hub |
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Posts: 133
Location: South Bend, Indiana | But I assume it would make a noise when it drops back in, which isn't present... or am I wrong? |
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Posts: 32901
Location: Rhinelander, Wisconsin | No, no noise if it's the prop hub. It's a splined rubber insert in the prop core, and if slipping will do so under high torque, like hard tuns or powering up. |
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Posts: 433
Location: Cedarburg, Wisconsin | What year is the motor?
My guess is you just have the wrong prop. Please tell us you are not running an Aluminum prop. |
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Posts: 133
Location: South Bend, Indiana | I have a 2001 225 Evinrude Ram Ficht, with a STAINLESS STEEL prop. |
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Posts: 13688
Location: minocqua, wi. | 2001 Ram Ficht
yup, that's your problem ... shoulda been a lemon law on that motor. go do some searching and you'll find a list a mile long, unfortunately. |
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Posts: 358
Location: London, England | Take a note of your revs and speed at wot, find out the make and size of your current prop, then contact Brainard props or another prop shop and ask them what you should be running. |
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Posts: 13688
Location: minocqua, wi. | what you're describing doesn't sound like a prop problem ... i mean, unless you have no clue how to drive a boat (which i assume not to be the case). |
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Posts: 133
Location: South Bend, Indiana | I feel like the engine wouldn't make a difference, or are they known to? |
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Posts: 13688
Location: minocqua, wi. | that engine might just be the most famous lemon of all-time ... |
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Posts: 433
Location: Cedarburg, Wisconsin | The info I found on your motor calls for 5500RPM WOT. So, I wouldn't worry about the revs unless you were consistantly going over that. If the prop is the same vintage as the motor, it will definitely have a rubber pressed in hub, so a spun hub is very possible. Also possible is that the prop could have had the cupping on the blades worn down from use, or it may have been modified for some reason. Check with your fingers at the blade tips and back edges for a distinct cupping. If there isn't any then the Stainless would behave more like an Aluminum prop and tend to lose bite cornering or climbing up on plane.
I'd see if I could borrow a different prop of suitable pitch and give it a try. That will probably fix the problem. If it's a three blade prop, changing to a four blade would help it carry the weight of your rig and still not lose grip. Mercury has some very nice props that will fit your motor with the correct hub kit. A Rev 4 or Trophy might be more of what you need. Hope you get the problem sorted out. |
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Posts: 133
Location: South Bend, Indiana | That's some awesome information... thanks!!! I'll try some things out and tell you how it goes. |
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Posts: 12
Location: western Ohio | Check the engine height or, prop shaft height to the bottom of the hull. Does it have a jack plate? If so lower it an inch. |
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Posts: 217
Location: ladysmith, wi | u should be running a prop with about a 26 pitch for best preformance, a rakerII type prop would work well |
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