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Anyone try a 4 blade prop on a Johnson/Suzuki DF 140 - Walleye Message Central
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  #1  
Old 05-19-2017, 04:00 PM
MuskieMat MuskieMat is offline
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Default Anyone try a 4 blade prop on a Johnson/Suzuki DF 140

Currently running an AL 14" 19 pitch 3 blade on a 140 Johnson 4 stroke on a 2003 Super Hawk. Seeing 58500 rpm at wot trimmed up just under 40 mph. This current prop blows out very easy in the turns. Wondering if anyone has had good luck with a 4 blade prop for better grip in the turns. Looking for a better prop for pulling a tube this summer

Thanks Mat
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  #2  
Old 05-19-2017, 08:20 PM
REW REW is offline
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Muskie,
Simply put, if you are running a Suzuki motor - put on a Suzuki Stainless prop and you will be happy.

http://www.suzukimarine.com/catalogs...x.html?page=28

The suzuki props run both larger diameters and heavier pitch than the props for most other outboards.

This is because of the quite different gear ratio in Suzuki outboards compared to other outboards.

Talk to a "good" dealer of Suzuki outboards for their recommendation with your motor and boat for the best advice.

Be safe
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  #3  
Old 05-19-2017, 09:35 PM
DW DW is offline
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Let me offer an alternate solution.

I have a Sportfish with a 140 which has nearly identical hull as your Superhawk. They both have a sharp 17 deg deadrise and have a bigger than usual extruded keel. My theory is when that hull goes into a very sharp turn, there is a lot of water turbulence flowing into the prop inducing blowout.

I don't experience problems with the prop blowing out except when I am doing aggressive tubing. I am certain that a 4 blade prop would reduce or eliminate blowout in sharp turns. However, going to a 4 blade prop causes an overall reduction in speed. One could swap out props when tubing, but that is too much trouble.

Although I haven't tried it the cheaper and easier solution is to install a manual jackplate enabling you to lower your motor when you tube which eliminates blowout. A manual jackplate costs about $250, which is less than a new 4 blade prop.
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  #4  
Old 05-20-2017, 08:32 AM
MuskieMat MuskieMat is offline
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I really don't want to lover the outboard any I just raised it two holes and it's 3/4" below the transom. It really feels like a new boat. I would hate to go back to plowing water in order to keep it from cavitation.
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  #5  
Old 05-20-2017, 11:42 AM
DW DW is offline
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The suggestion is to lower the motor temporarily using the jackplate when tubing, then raising the jackplate to your preferred height when you are done tubing. Only takes minutes to change heights if it is manual or seconds if it is automated.

I understand how bad performance is when the motor is too low and how significantly performance improves when the motor is raised, so keep it raised except when tubing. Maybe you are unfamiliar with a jackplate?
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  #6  
Old 05-20-2017, 12:11 PM
REW REW is offline
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Muskie,
Get a good Suzuki Stainless prop with the correct diameter and pitch for your rig.

Get one of the Suzuki props that have a good degree of Rake in their design.

Increased amount of rake in a prop design really helps to keep the prop hooked up in high motor and high prop situations.

I think that you would be well pleased with the difference in performance.

Work with a shop that has a try before buy situation, so that you can try out three or 4 different props before investing any money in a prop that may be incorrect for your rig.

Good luck

http://www.propellerworld.co.uk/Prop...llers_wor.html
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  #7  
Old 05-20-2017, 12:12 PM
REW REW is offline
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http://www.purepropeller.com/propeller-basics/

I would think that one of these would be the perfect prop for your rig:

90-140 Stainless Steel 3 14 18 99105-00700-18P n
90-140 Stainless Steel 3 14 20 99105-00700-20P n
90-140 Stainless Steel 3 14 22 99105-00700-22P n

These are the Suzuki part numbers for their 18 pitch, 20 pitch and 22 pitch prop. Likely - it will be either the 18 or the 20 pitch prop. Notice, that the diameter of all three of these props are 14 inches which is good with the gear ratio that suzuki runs in their lower unit.

Be safe

Last edited by REW; 05-20-2017 at 12:17 PM.
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  #8  
Old 05-20-2017, 02:40 PM
DW DW is offline
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A 14" stainless steel prop is a good choice to improve overall performance but it will not cure blowing out in tight turns when tubing.
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  #9  
Old 05-20-2017, 04:41 PM
JMW JMW is offline
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I ran a Stiletto 14x20 stainless prop on my 2004 Johnson 140. Motor was mounted high on my 2004 Alumacraft Tournament Sport 175 . Great performing prop. Suppose to be very similar to Suzuki's. Usually reached 6000 to 6100 rpms. A 14x21 Johnson/Suzuki aluminum prop would hit same rpms. You should probably have your cavitation plate an inch above bottom. Better performance from stainless. Just trim down when needed.
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  #10  
Old 05-20-2017, 05:32 PM
MuskieMat MuskieMat is offline
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Quote:
Originally Posted by JMW View Post
I ran a Stiletto 14x20 stainless prop on my 2004 Johnson 140. Motor was mounted high on my 2004 Alumacraft Tournament Sport 175 . Great performing prop. Suppose to be very similar to Suzuki's. Usually reached 6000 to 6100 rpms. A 14x21 Johnson/Suzuki aluminum prop would hit same rpms. You should probably have your cavitation plate an inch above bottom. Better performance from stainless. Just trim down when needed.
The outboard is in the bottom hole and as close to perfect as I can get. I will probably keep an eye out for a good used 14x20x3 stainless and give it a try. Maybe someone has tried a 14 x19 4 blade on on a similar setup and can comment.

Thanks Guys

Last edited by MuskieMat; 05-21-2017 at 07:54 AM.
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