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Propping a Honda BF75 on a Montauk
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| Paul Graham |
Posted on 10/02/09 - 2:53 PM
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The throttle bracket is fully engaged, I would think there is no way the carbs are not opening all the way. I am so diappointed in the 13" prop, I am thinking about exchanging back to the 15" prop reguardless. I think I will pull the carb assembly 1 more time just for piece of mind. I am heding out of town tonight so it will be Sunday or so before I get back on it. Hey, did you recieve the email I sent you, thanks
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| Tom W Clark |
Posted on 10/02/09 - 2:57 PM
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No, I did not.
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| Joe Kriz |
Posted on 10/02/09 - 3:02 PM
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What WOT RPM's did you get with the 13 pitch prop?
I suggest you take and keep the records of the WOT RPM's for the different props just for reference.
Something is definitely not right with this setup....
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| number9 |
Posted on 10/02/09 - 3:27 PM
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What were your results with 13x13 prop from the Honda dealer? Weight of new boat combination and WOT mph on previous boat?
Bill...On the Ogeechee
1984 Outrage 18...Yamaha T50...that's right, 50hp |
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| Paul Graham |
Posted on 10/04/09 - 6:45 PM
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The 13x13 prop turned 5800 rpm, I didn't like it, the motor was screaming and going nowhere fast. I don't know the weight of the rigg but posted a photo on my PP to get an observed opinion if it looked water logged. I can't be sure now what the motor was turning on the older hull, If I remember right it was 5200 rpm with a Slilletto 19x13 3/8
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| Tom W Clark |
Posted on 10/05/09 - 9:25 AM
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Paul,
How fast were you going with the 13" x 13" propeller?
What 13" x 13" propeller were you using?
There is no such thing as a 19" x 13-3/8" Stiletto propeller. There is not even a 13-3/8" x 19" Stiletto. I believe Paul has previously reported it was some other brand and model of propeller.
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| Paul Graham |
Posted on 10/05/09 - 11:06 AM
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Jeff Whidden at ptprop.com calculated based on rpm, prop and gear ratio that I was running 28mph.
He also calculated that I was running 30 mph with the 15" prop, sure seemed to be a bigger loss in speed than just 2mph. He seemed quite knowledgable
the 13" prop is 9CD3R13PH1150 semi clever
the 15" prop was ELD3R15 PVT145
Both are powertech props
The original prop was a Stiletto (imprinted on the side) I' sure it was a 19" prop maybe I'm off on the diameter but I don't think so. I was new in 1995, maybe they had that prop sze configuration back then
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| Tom W Clark |
Posted on 10/05/09 - 11:20 AM
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Paul,
Sure you can use a prop calculator to estimate the boat speed, but we need to know what the actual boat speed is, as measured by a GPS. If your tachometer is off, then that explains a lot.
I saw a friend last night who has a Montauk with a Mercury four stroke 60 HP motor on it. He gets 34 MPH out of it so you can see why I am skeptical that you are only getting 28 or 30 MPH with a 75 HP motor.
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| Tom W Clark |
Posted on 10/05/09 - 11:24 AM
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Paul,
Earlier in this thread you wrote:
The prop I have is an Attwood 335132, 13 3/8 x 19
Attwood is the parent company of Michigan Wheel, which what I suspect you really have (had), not a Stiletto.
Michigan made the stainless steel Rapture model in that size with that part number.
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| Tom W Clark |
Posted on 10/05/09 - 11:34 AM
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...the motor was screaming... .
This is yet another reason why I suspect your tachometer may not be reading correctly.
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| Paul Graham |
Posted on 10/05/09 - 12:57 PM
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Tomorrow, I'm trading the 13x13 back for the 15x13.5 prop, I'll pick up a new tach while I'm out. I'll let yll know how she does, thanks
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| Joe Kriz |
Posted on 10/05/09 - 12:59 PM
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Paul,
Earlier you said you took everything off the old boat.
Did that include the tach also?
What brand of tach? Honda?
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| Tom W Clark |
Posted on 10/05/09 - 1:15 PM
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Paul -- In propeller nomenclature, diameter always precedes pitch. Thus I think you meant to write that you have a 13-1/2" x 15" prop.
Also, borrow a handheld GPS while you're out, or if you have an iPhone or Blackberry, just download the speedometer App. so you can get some accurate speed data.
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| Paul Graham |
Posted on 10/05/09 - 1:22 PM
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I am going to borrow a gps tonight, and your right I'm tradin the 13" pitch for the 15" pitch, thanks. what does the tach pick up for signal to interpret into rpm's?
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| Joe Kriz |
Posted on 10/05/09 - 1:29 PM
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Paul,
I will ask again.....
What brand of tach do you have and is this the same one that came off of your other boat?
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| Paul Graham |
Posted on 10/05/09 - 1:49 PM
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Sorry, I overlooked your question. It's a teleflex tach, I also tried 3 other used tachs. i will quick playig with junk and just buy a new tach
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| Joe Kriz |
Posted on 10/05/09 - 1:55 PM
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Thanks Paul...
I am a firm believer in using a tach that is the same manufacturer as the motor.
In your case, I would buy a Honda tach.....
I just visited the Honda site and they do list Teleflex gauges as one of their accessories....
I would buy what Honda recommends for your motor
Edited by Joe Kriz on 10/05/09 - 1:59 PM |
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| Paul Graham |
Posted on 10/06/09 - 7:48 AM
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Tom, maybe it was a Ballistic prop I had originally on the boat
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| A Little Madness |
Posted on 10/06/09 - 9:07 AM
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About 2 years ago we repowered A Little Madness w/a Honda BF90D (I know it's not the same but I'll get to the point soon). On the advice of the Honda Regional Rep (not the mechanic) we installed a Honda Titan Solas 13 1/4 15R Stainless Steel Prop. The boat comes out of the hole like a shot and runs as fast as I could possibly want it for my wife & I. And before anyone asks, I've not kept any records having gone thru 2 back operations this year. I did get a new Honda instrumentation package in the purchase and agree on keeping it in the engine family.
The real point of my response is that these Regional Reps really know their boats and are best suited to get the right prop on your 75.
You can see our beauty on our personal page.
Chris & Dale Schnell
"A Little Madness" - 1989 Montauk 17' |
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| Paul Graham |
Posted on 10/18/09 - 7:18 PM
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I installed a new tach, put the 13.5x15 prop back on the motor and borrowed a gps. Turned 5600 rpm's @ 34 mph, I'm pretty happy with it. What do yall think?
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