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05-25-2008, 06:36 AM
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#1
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Ifish Nate
Join Date: Jun 2002
Posts: 2,790
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Prop Change
I have a BF-90 Honda motor. The original prop is a 3 blade prop. I recently bought a 4 blade prop that came off of a BF-110 Honda. Since it is BF series, it fits perfectly. Will this have any effect on my motor operation?? Will I have to watch the RPMs??
Thanks for any insight You can give me.
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Captain 2003 Ifish Sturgeon challenge Team Champions
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05-25-2008, 07:07 AM
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#2
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Ifish Nate
Join Date: Aug 2000
Location: Portland OR.
Posts: 2,866
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Re: Prop Change
A four blade might give you a quicker hole shot I would think, and stay hooked up better in a real tight turn.
I don't think that with our typical non performance hulls in our typical fishing boats here in the NW, and only a 90 hp motor, you may not notice any difference at all.
As long as your RPMs are running where they're supposed to at WOT your good to go.
Smj
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Member# 332
I'll share the road....When they start paying for it!
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05-25-2008, 12:10 PM
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#3
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Tuna!
Join Date: Apr 2002
Location: South Coast
Posts: 1,239
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Re: Prop Change
I have a BF90 also. What diameter's and pitches are we talking? At WOT you'll want to be turning around 5.5k minimum, 6k max. 
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05-25-2008, 06:37 PM
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#4
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Steelhead
Join Date: Jun 2006
Location: St Helens
Posts: 285
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Re: Prop Change
I have a 4 blade 15 pitch prop on my 90 Honda mounted on my 17 ft Arima Sea Chaser. I can run right at 6000 rpm but my mph is only about 34. Anyone run a 17 pitch prop on a similar set up?
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Never sniff a gift fish
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05-25-2008, 06:42 PM
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#5
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Ifish Nate
Join Date: Jun 2002
Posts: 2,790
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Re: Prop Change
prop is 4 blade 15. 90 is on a 200 searunner. I will keep rpm between 5500 and 6000 and check speed with GPS.
Thanks for the info
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Captain 2003 Ifish Sturgeon challenge Team Champions
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05-29-2008, 09:51 AM
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#6
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Ifish Nate
Join Date: Jun 2002
Posts: 2,790
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Re: Prop Change
Tested it and the 4 prop seems a little better out of the hole and speed was about 1.5 mph faster at 5800
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Captain 2003 Ifish Sturgeon challenge Team Champions
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06-02-2008, 03:11 PM
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#7
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Chromer
Join Date: Aug 2006
Location: Troutdale/Lakeside
Posts: 640
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Re: Prop Change
Quote:
Originally Posted by No Wishin Just Fishin
Tested it and the 4 prop seems a little better out of the hole and speed was about 1.5 mph faster at 5800
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What is your top speed and is 5800 your WOT?
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"The less a man knows, the more sure he is that he knows everything" - Joyce Cary
http://www.ccapnw.org/
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06-02-2008, 04:20 PM
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#8
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Tuna!
Join Date: Feb 2002
Location: Vancouver, WA
Posts: 1,388
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Re: Prop Change
Quote:
Originally Posted by Channel rat
I have a 4 blade 15 pitch prop on my 90 Honda mounted on my 17 ft Arima Sea Chaser. I can run right at 6000 rpm but my mph is only about 34. Anyone run a 17 pitch prop on a similar set up?
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Sounds like a perfect setup! Why change? Chasing a couple mph? You're going to give up low-end performance to get it.... 34mph in an Arima is about all you should expect. You want faster, buy a different hull!
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06-02-2008, 07:23 PM
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#9
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Steelhead
Join Date: Nov 2006
Location: Vancouver, WA
Posts: 324
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Re: Prop Change
Replaced my three blade with a four blade a few years ago, 90 hp merc 4 stroke, same pitch prop as before. Not only better hole shot, but better handling in turns, etc.
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06-04-2008, 08:29 PM
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#10
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Tuna!
Join Date: Dec 2003
Location: Bothell, WA
Posts: 1,198
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Re: Prop Change
You guys must be rich. Chugging along at a nice, sedate 4000, even 4500 rpm, instead of 6000, doesnt take that much longer to get there but sure saves on gas.
http://www.yamaha-motor.com/assets/p...ner-f90txr.pdf
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Websters Dictionary:
boat: /bot/noun 1. a small vessel propelled by oars, paddles, sails or power; 2. acronym meaning "Bring Out Another Thousand!"
Fishing rule #1, find out how the locals fish and fish the same way!
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06-05-2008, 10:22 AM
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#11
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Chromer
Join Date: Jan 2006
Location: Lakeside, Oregon
Posts: 735
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Re: Prop Change
Quote:
Originally Posted by BARCHASER
You guys must be rich. Chugging along at a nice, sedate 4000, even 4500 rpm, instead of 6000, doesnt take that much longer to get there but sure saves on gas.
I doubt that they are running at 5,800-6,000 RPM's everywhere they go!
Correct propping of a boat requires you to find out what the WOT (Wide open throtle) RPM's are with each individual prop. We all know what over reving can do, but a prop with too much pitch will lug your engine even if you are not running WOT and can cause as much or more damage in the long run than running the same engine at or near the rated RPM!
http://www.yamaha-motor.com/assets/p...ner-f90txr.pdf |
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My goal in life is to leave the largest carbon footprint that I posably can!
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SouthCoastStu
