Question about prop pitch

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Joe Friday
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Question about prop pitch

#1 Post by Joe Friday » Mon Jul 16, 2018 7:04 pm

Sorry if this has been discussed elsewhere. I have a 2015 Lowe SF214 with a 2015 90HP Merc 4S. The existing prop has been dinged up a bit, and I want to replace it. The boat came with a 14X13 prop. WOT is 5300RPM at 21MPH. The Mercury prop selector page is suggesting a 14X11 prop for my weight/engine combination. I plan on staying with an aluminum 3 blade prop.

Looking for thoughts about which prop to go with. I believe that 5800RPM is max for my engine.


Joe Friday

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Re: Question about prop pitch

#2 Post by curtiscapk » Tue Jul 17, 2018 6:08 am

I'd say 14x11 would put you spot on!
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Re: Question about prop pitch

#3 Post by BobG » Wed Jul 18, 2018 12:08 pm

Yes, 5,300 WOT on the 13 pitch shows that your pitch is too high (WOT RPM's are too low), so you're not getting your engine up to max horsepower.
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Joe Friday
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Re: Question about prop pitch

#4 Post by Joe Friday » Thu Jul 19, 2018 6:34 pm

I have ordered the 14X11 replacement. That was my first thought also, given the WOT RPM. I was just a little concerned to make a change from what may have been the original prop supplied when the boat was new. I hate to second guess the manufacturer. I'll post the results once I put it on and do some test runs. Thanks for the responses!


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Re: Question about prop pitch

#5 Post by wwind3 » Fri Jul 20, 2018 4:45 am

I'm running a 13 x 16 on my 20 ft Lowe with a 90 Optimax Merc. I can get 27 mph at 5800 rpm(if tach is correct) That is with a stainless prop---strangely a 13 x 16 aluminum will get me 1-2 mph more---go figure.
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