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Old 07 August 2015, 17:12   #1
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Country: UK - England
Town: Thornaby
Boat name: Storm
Make: Humber Ocean Pro 6.5
Length: 6m +
Engine: Suzuki DF 150
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Right prop ???

So boys and girls. This is my new love in my life "Storm"
She is a Humber Ocean Pro 6.5 extra wide beam.

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This is the business end......

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And this is the prop that is on it......

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I took her out for a test run two up and a full tank of juice, only seemed to reach 36mph, at 5100 rpm. Does this sound right with this prop ? Not that I go flat out all the time or need the top end speed just thought it would be quicker !!?

What do you think ?

Cheers, Phil
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Old 07 August 2015, 18:49   #2
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Country: UK - Scotland
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Make: Ribcraft 6.8
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Phil,

ideally someone with the same engine on a 6.5 boat will chime in their own findings, in the mean time-

as a GENERAL guide you change 200 rpm with every 1" of pitch change. looks like it is a 17" prop you are looking for then, maybe also drop the dia down to a 15" perhaps worth looking at.

i try to prop for 5650-5700rpm (others may vary ofcourse) with my normal load and a full tank of juice, as fuel goes down it will get into the butter zone....in theory!

in case no one with a similar rig responds, more info can be seen here on the zuke site-

look at similar weight boats here and props they spin- http://www.suzukimarine.com/Product%...012/DF150.aspx

take for example- http://www.suzukimarine.com/Product%...0220FX%20DF150

it is a bit heavier, deep ish V and swings a 15x21 up in the 5800rpm range with 140 ish litres of fuel on board...interesting IF accurate!

assuming (dangerous) the info on the zuke site is accurate that would suggest perhaps your motor isn't making all its power. could be fuel filters maybe or perhaps there is water in the hull or outboard too low etc?

it may be wise getting a print out of the motor diags before doing anything else, it will tell you how many mins have been spent at what revs. assuming the original owner never changed the prop that will give you an idea where to go.

without question though, i would get the RPM up one way or another.

someone hopefully along with similar setup soon with more bespoke info, but the above should hopefully get you an idea on prop sizes.

cheers
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Old 08 August 2015, 15:41   #3
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Country: UK - England
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Make: Humber Ocean Pro 6.5
Length: 6m +
Engine: Suzuki DF 150
Join Date: Jan 2008
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excellent thnk-you so much for your in-depth reply.
i think i have found what is the problem, its only running on 3 pots. found one spark plug brand new and the rest slightly charcoled.
what does get me tho, the engine has only done 42 hours... at 41 hours the previous owner had some slight water in the internal tank, it went to be sorted properly at a suzuki dealer along with a full service to the tune of nearly 1000......

anyway, i swapped the plugs and the same problem.. so i guess im going to have to pull the plugs and see if i can see a spark..... could it be a ignition coil ??111!?!?
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Old 08 August 2015, 16:11   #4
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if the outboard only has 42 hours on it i assume it is still under warranty?

for 1000 there must have been parts replaced, perhaps injector/s due to water for example. a typical service and fuel tank clean out should have cost in the region of 400 or so......so what did they replace and why????

anyways, you could start by swapping the plugs, leads, coils etc

cheers
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Old 08 August 2015, 16:46   #5
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Country: UK - England
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Not sure of the detail. Although I could find out more.
The engine and boat are actually 2011 just never used. The work was done beginning of last year. I'll have to have a play tomorrow.

Thanks for your advice.

Phil.
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Old 08 August 2015, 18:37   #6
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the engine is still under warranty, you get 3 with a 2 bolt on in UK.

MySuzuki - Warranty | Suzuki GB Marine

just take it to your dealer.

cheers
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Old 08 August 2015, 18:53   #7
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Very nice , 🍀Well ware
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Old 09 August 2015, 01:40   #8
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That is 36 MPH and not 36kn ? (which wouldn't be a million miles (pardon the pun) off the mark. I think if you were a cylinder down you would be complaining of the engine running rough as a badger's *&^% and I'd doubt you would get 36MPH. .....just a thought.
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Old 09 August 2015, 05:56   #9
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Country: UK - England
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Length: 6m +
Engine: Suzuki DF 150
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I'll give the dealer a bell. Between 2000-3000 ish it does run rough and the vibration is massive.

So this morning I start it up and whilst running pull the suspected ht/ coul lead off and the running does not alter does sound a little rough but not much as idle. Push it back on and remove another engine straight away flutters then stalls. So I'm now think at least it's the bottom coil in question.
I swap the coils about do the same again. Remove bottom plug, nothing happens then I remove the plug in question that I have now placed in pot two and it flutters and the stalls.
Soo obviously something more than the coil. Checked all fittings and plugs and all seems fine 😳😔
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