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13 sport water spray issue
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| Joe Kriz |
Posted on 03/27/12 - 11:08 PM
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Slickity,
That pin should always remain in the lowest hole...
That is a manual tilt pin for motors that don't have power trim & tilt..
You motor has power trim & tilt....
So, leave that pin in the lowest hole and forget about it...
It does absolutely nothing for you....
Disclaimer:
There are other things to use that pin position for but this is not one of them....
Leave the pin in the lowest hole....
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| Tom W Clark |
Posted on 03/28/12 - 7:12 AM
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Joe is correct. Any outboard with power trim-n-tilt does not even need a tilt pin, but I like to have one in the lowest hole just on case the power trim fails and I need to manually drop the motor down to operate it. In that case you move the pin where you want it but otherwise it should be in the lowest hole so as not to limit the range of motion of the outboard.
The whole point of power trim is to allow you the change and angle of the motor for varying conditions. Generally you will want the motor tucked in when accelerating onto plane and trimmed out the faster you go to lift the bow.
A 2000 Johnson 40 has four sets of mounting bolt holes. On a 13 footer the motor should be bolted on with the THIRD set of holes, that is, "Two Holes Up". This motor mounted all the way down on the transom will almost certainly cause a lot of drag and spray.
The SST line of propellers is good, though very old at this point. It is not known for great grip at high mounting heights so it is no surprise it is not gripping with the motor mounted all the way up. The only prop I recommend for operation at the highest mounting height is the aforementioned Stiletto.
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| Slickityd16t |
Posted on 03/28/12 - 3:02 PM
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Well I do appreciate everybody's help. I was able to hit 32.1 mph today, I couldn't get enough of the boat out of the water to go any faster before it started to cavitate again. I will definately keep the Stiletto prop in mind just wish I could try it before I buy. So I will have to decide where I want to go from here. Thanks again.
1986 13 Sport - 40 hp Smoker |
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| Tom W Clark |
Posted on 03/28/12 - 3:08 PM
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One more thought: You *have* removed the foil from the motor, haven't you?
A Sport 13 with a 2000 Johnson 40 should easily be capable of 35 MPH and maybe even 37-38 MPH with power trim. 32.1 MPH makes me suspicious of something being wrong with the set up. If that foil is still on there, that's part of the problem.
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| Tom W Clark |
Posted on 03/28/12 - 3:14 PM
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What was the engine speed today when you hit 32.1 MPH? Do you have a Tachometer?
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| Joe Kriz |
Posted on 03/28/12 - 4:24 PM
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From one of his prior posts.
Right now it has a Solas 12x17. I bought a used SST 11.25X21
It's been many years since I have owned a 13', but it seems a 21 pitch prop is way over propped. Anyone disagree?
Also, we have no way of knowing how good this used prop is.
As Tom mentions, do you have a tach installed?
This would tell us much needed information.
I also would try and find a good prop shop that will "Loan" you a prop to try before buying.
His boat looks clean... No bottom paint.. Appears to sit in the water good.
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| Geo |
Posted on 03/28/12 - 4:46 PM
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Based on what you have told us, I think your hull is warped. A pocket of air is forming under the hull as you are underway, and no amount of correction at the prop, or at the engine height, is solving this problem. This can happen if the boat is stored for a long time in a bad position.
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| Slickityd16t |
Posted on 03/28/12 - 6:28 PM
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It was 5000 rpm. I doubt the hull is warped it's been on a trailer when its not in the water. I also just bought a stiletto triad prop.
1986 13 Sport - 40 hp Smoker |
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| John Fyke |
Posted on 03/28/12 - 6:30 PM
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Geo wrote:
Based on what you have told us, I think your hull is warped. A pocket of air is forming under the hull as you are underway, and no amount of correction at the prop, or at the engine height, is solving this problem. This can happen if the boat is stored for a long time in a bad position.
If his hull is warped I highly doubt he'd even hit 32mph.
John Fyke
Re-Fit or Reef It
1979 15' Sport with Super Sport conversion and 70hp mercury. |
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| Tom W Clark |
Posted on 03/28/12 - 6:44 PM
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I see no evidence of a warped hull.
Joe -- You are right, a 21" prop is w a y too much pitch for that boat/motor combination.
The 2000 Johnson 40 uses a 2.42:1 gear ratio and 32.1 MPH with a 21" pitch prop is only 4300 RPM if you assume 10 percent slip. Hell, if the prop slipped so badly that there was 20 percent slip, the poor motor couldn't have reached more than 4800-4900 RPM. That motor should really reach 5000-55500 RPM at WOT if it is propped correctly.
Again, I recommend the 11-3/4" x 17" Stiletto Triad 3.5, a propeller with a lot of grip and inexpensive too. For the price of the foil and the used SST, the Stiletto probably would have solved all the problems and got the boat to 35 MPH where it should be.
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| Tom W Clark |
Posted on 03/28/12 - 6:46 PM
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Oh, a few posts snuck in while I was composing that.
OK, 5000 RPM at 32.1 MPH with a 21" pitch prop through 2.42:1 gears is 21.9 percent slip. No wonder the prop was loosing grip and ventilating!
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| Joe Kriz |
Posted on 03/28/12 - 6:55 PM
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Slickityd16t wrote:
It was 5000 rpm. I doubt the hull is warped it's been on a trailer when its not in the water. I also just bought a stiletto triad prop.
He says he just bought the Triad prop but didn't tell us what size...
17 pitch, 19 pitch, or other...........?????
Man, I feel like a dentist here pulling teeth...
Please, give us all the information you can so we don't have to keep on guessing....
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| Slickityd16t |
Posted on 03/28/12 - 7:44 PM
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Sorry I got the 19 pitch since I'll be put on 55 hp head and jets
1986 13 Sport - 40 hp Smoker |
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| blacksmithdog |
Posted on 03/29/12 - 4:28 AM
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Just as a comparison, my 13' standard with a 25 Merc 4 stroke runs in the high 20's per GPS depending on conditions and load.
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| dgoodhue |
Posted on 03/29/12 - 5:45 AM
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Slickityd16t wrote:
Sorry I got the 19 pitch since I'll be put on 55 hp head and jets
Are you 100% sure those mods are going to up you hp to 50-55hp and will it shift your rpm range higher? On a 15' whaler I have a 19p stiletto & 21p sst with a motor w/ 2.42:1 gear ratio. My rpm range is a little higher @ 6000 rpm but I hit 47mph @6200rpm with those brands of props (mine are different diameters)
If you can get the to motor spin to 5500rpm, your boat will speed should be around 42mph. That is not goin to happen with your 40 on a 13'. I looked up a 2000 50hp 2 stroke and the rpm range is to 6000 rpm. I don't think your boat will run 45 mph with 50 or 55 hp either.
Dave |
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| dgoodhue |
Posted on 03/29/12 - 6:26 AM
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Also the right prop for 40 @5500 is the right prop for 50 @6000 for a 13' whaler.
Dave |
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| Phil T |
Posted on 03/29/12 - 6:56 AM
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I agree with Joe, this is like wack-a-mole.
Slick, we need to take baby steps and solve one issue without making other changes. Right now we are trying to help you with motor height and prop size, before any "engine enhancements".
We are 74 posts along. The spray issue is resolved (post 44) but we now have the correct prop question.
Please do a test run with the Triad 19p prop and report speed via GPS with WOT rpm's.
Please don't do any changes to the engine before or after the test.
At Wot you should use the power trim. In applying trim you should watch your GPS speed. As you trim out, your speed will slowly increase with no change in RPM's. When speed starts to slowly decrease with more trim, back down the trim slightly. That is the optimum trim point.
Edited by Phil T on 03/29/12 - 7:04 AM
1992 Outrage 17 I
2019 E-TEC 90, Viper 17 2+
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| Tom W Clark |
Posted on 03/29/12 - 7:16 AM
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Triad 19 inch is going to be too much.
Does anybody know if he took the foil off or not? He never said as far as I can see, but this thread is getting ridiculously long and maybe I missed it.
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| Slickityd16t |
Posted on 03/29/12 - 10:53 AM
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The foil is off. I will not install my upgrades until I get the prop situation close to solved. If the rpm's are a bit low with the new triad 19 pitch I can deal with it, as when the upgrades are installed should bring the power up enough to bring the rev's to optimum level.
Edited by Slickityd16t on 03/29/12 - 2:36 PM
1986 13 Sport - 40 hp Smoker |
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| Slickityd16t |
Posted on 03/29/12 - 2:43 PM
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dgoodhue wrote:
Slickityd16t wrote:
Sorry I got the 19 pitch since I'll be put on 55 hp head and jets
Are you 100% sure those mods are going to up you hp to 50-55hp and will it shift your rpm range higher? On a 15' whaler I have a 19p stiletto & 21p sst with a motor w/ 2.42:1 gear ratio. My rpm range is a little higher @ 6000 rpm but I hit 47mph @6200rpm with those brands of props (mine are different diameters)
If you can get the to motor spin to 5500rpm, your boat will speed should be around 42mph. That is not goin to happen with your 40 on a 13'. I looked up a 2000 50hp 2 stroke and the rpm range is to 6000 rpm. I don't think your boat will run 45 mph with 50 or 55 hp either.
I sure the mods will bring me up higher. The only difference in the 40,50, and 55 are the jets between all three, and the head on the 55 which I have. Also the 55 has a bigger midsection and gearcase. The midsection section exhaust ports I'm pretty sure are the same size. The only power killer is going to be the through hub exhaust since 55hp's have a larger hub.
1986 13 Sport - 40 hp Smoker |
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