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Posts: 109
Location: Wisconsin River | I have an older Esox Mag recently repowerd with a Suzuki 115. Top speed is the same as the older 90 evinrude I removed. New motor is hung all the way down running a suzuki 19p prop aluminum. runs about 6k rpms. cant trim the motor much, starts hopping. any tips to correct handling problem or prop sugestions. Top speed read on the hummin bird gps is low 40s.
Edited by Big Rock 11/16/2012 8:27 AM
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Posts: 32889
Location: Rhinelander, Wisconsin | Get the motor up at least one notch and get one pitch HIGHER stainless prop. |
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Posts: 109
Location: Wisconsin River | Any specific prop that works best? 3 or 4 blade, brand? |
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Posts: 32889
Location: Rhinelander, Wisconsin | Suzuki has a very confusing array or props, and that motor is geared differently than a Merc. Hit up your Suzi dealer. Get one pitch HIGHER stainless, made a boo boo there. |
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Posts: 3480
Location: Elk River, Minnesota | Hiya,
After looking at some specs on the suzuki 115 (I am assuming 4 stroke yes?), the motor has a top RPM value of 6000. I would agree, you can definitely move the motor up, and if you are looking to go steel, you can get into a solidly cupped and highly raked prop that would allow you to probably move the motor up to the top hole, but I am not all that familiar with the transom of the mag C series. If there is no set-back (where the hull meets the transom edge) then you can go all the way up. If there is a set back (similar to what a jackplate is doing, the set-back might already be set to have the motor higher, so you may not have to come up as many bolt holes.
When switching to steel in the same design and pitch as a stock aluminum, you can expect about 200 RPMs less since the prop will not flex anywhere near as much as an aluminum. But...if you switch styles, add rake, cup, etc. you will tend to lose a bit more since the prop will have a better ability to grab the water and hold on.
In your case, I would say move the motor up 2 holes and get a good raked prop in the same pitch. I would suggest a BRP raker in an 18 pitch as they don't have a 19 pitch, and the prop is another 1/4" bigger in diameter overall. When you move the motor up, you should see about the same RPM's as you are currently running now...just with better handling and top end.
Steve |
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Posts: 32889
Location: Rhinelander, Wisconsin | Two may be a bit high, that transom is already 21.5" |
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Posts: 109
Location: Wisconsin River | So if I raise the motor one hole and put on a new ss prop what kind of performance gain do you think I should see? I am looking at a trophy+ or laser prop. Jack Plate or not?
Edited by Big Rock 11/25/2012 5:49 PM
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Posts: 3480
Location: Elk River, Minnesota | Hiya,
I'd say trophy + over a laser...if you can find a raker, I think you would like that better than the laser.
Steve |
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Posts: 109
Location: Wisconsin River | Is the raker 3 or 4 blade. I think I may go 4 blade to help with turning |
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Posts: 32889
Location: Rhinelander, Wisconsin | No jack plate, not needed unless running a Merc 135.
That's a padded hull; you can't make hard turns wide open. You will need to trim down and drop speed to turn hard, as with any padded hull. The 3 blade will offer you the best performance overall. |
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Posts: 58
| I agree with the 3 blade. I have a Mag C with a 115 e-tec, and the 4 blade did not perform very well. I am currently running a 20 pitch raker, and it turns about 5500rpm with and average load. In the right conditions I can get over 50mph on the gps. The outboard is all the way down, but I would prefer to raise it one hole. The problem I have with that is finding a spacer that will allow me to compensate for the lip on the top of the transom. |
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Posts: 32889
Location: Rhinelander, Wisconsin | You can use a dremel and notch the transom cap so the bracket fits through. Re-seal the seam with silicone sealant. |
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Posts: 3480
Location: Elk River, Minnesota | Hiya,
The Raker is a 3 blade. You can usually find one in great shape off ebay. I purchased mine for about $175 last fall when I switched out to a Johnson outboard from a Yamaha. 13 splines, which is what your 90 should have as well I believe.
As you can see in the picture, the trailing edge of the prop has a substantial amount of cup, which will help raise the stern, and the tips are cupped which will help with bow trimming. It is a well designed prop for higher motor heights and still grab water well.
Steve
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 Raker Prop.jpg (8KB - 164 downloads)
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Posts: 109
Location: Wisconsin River | Thanks for the the feedback. Thats the kind of info I was looking for. The real question I was looking for was, does this hull respond well to tweeking the setup or would the gains be small. I have seen some boats that just do not change performance much no matter what you do. In some cases a ss prop will have negative effects such as a smaller motor or some deeper under powerd hulls gaining very little performance.
Now I feel a little more confident about spending some $$$ on making this old boat look alittle better and perform the way it should with this kind of power behind it. |
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Posts: 3480
Location: Elk River, Minnesota | Hiya,
With the right prop and motor height combination, most boats will come alive and you will see major differences in performance (major being a relative term to what you are looking to get out of the rig). If you enjoy the tweaking, it can be a fun thing to do without too much expenditure of money. That is why playing with motor heights and props can be a fun time....especially if you are mechanically inclined.
One other note to consider... if you can find a prop shop that has a demo program, they may have multiple styles of props to try in various pitches to really dial in.
Steve |
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Posts: 109
Location: Wisconsin River | I agree. pushing the outboard up and down is cheap if you can handle that. The shops in my area dont like to demo props. If you put one on you pretty much own it. That can get expensive. With things starting to lock up here, the tweeking may have to wait till spring. I will be keeping an eye out for a prop that has a good reputation with this hull. So far it sounds like the Raker works well and a 4 blade will not enhance handling, may reduce speed over a 3 blade. Any other feedback is welcome or advice on props & spacer combinations that will work on this motor. PM me if you have a prop you want too sell. |
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