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Old 18-06-2014, 09:32 PM   #1
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Country: U.K
Location: poole
Occupation: Marine Game... Bennett Marine
Interests: fast boats......
Boat make: phantom 21, Searay 260 Ov
Engines: XR 2, 2 x 4.3 V6
Cruising area: poole bay - solent, where petrol allows

Join Date: Dec 2011
Location: poole
Posts: 136
4.3 V6 mercruiser prop help

Hi all,

I've got a 26ft Searay running a pair of 4.3 205hp V6 mercruisers on standard alpha drives turning a pair of vengeance 23P props, I'm only getting 3500 rpm flat out so I'm assuming it's over propped, anyone confirm this?? The port side is counter rotating too.. Cheers Mark.
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Old 19-06-2014, 08:12 AM   #2
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Hi. Standard props on the Alpha with a 4.3 are either 17x14 1/4, 19×14 1/4, 21×14 1/4.

You do look to be overpropped and from my experience, relatively heavy sportscruisers run much better with the bog standard quicksilver props. I would drop to 19's to try and get your performance up. Is the boat kept in the water ? If it is, even a little bit of fouling could keep the speed down, make sure you have a clean hull before you splash out £300 on new props.
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Old 19-06-2014, 08:46 AM   #3
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Country: Denmark
Location: Funen
Boat make: Askeladden 565 Wasper
Engines: Mercury Optimax 225

Join Date: Oct 2011
Location: Funen
Posts: 95
you need 1300 rpm to hit recommend wot at 4800 rpm.
IMHO I would go for the 17" Mirage Plus, the large diameter blades will carry your heavy hull great.
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Old 19-06-2014, 08:59 AM   #4
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Country: U.K
Location: poole
Occupation: Marine Game... Bennett Marine
Interests: fast boats......
Boat make: phantom 21, Searay 260 Ov
Engines: XR 2, 2 x 4.3 V6
Cruising area: poole bay - solent, where petrol allows

Join Date: Dec 2011
Location: poole
Posts: 136
thanks for the info. the boat is clean as only went in the water last weekend. I need to try and find some props to try out so I can get the balance right.
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Old 19-06-2014, 10:33 AM   #5
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Country: Uk
Location: Ruislip
Boat name: East meets west
Boat make: SEARAY 230 ov
Engines: 7.4 mercruiser
Cruising area: Solent

Join Date: Jun 2014
Location: Ruislip
Posts: 8
Hi Mark

I wonder if the new engine is down on power, she would rev round to about 4200 when I had her so prob a tad over propped but much
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