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Old 11-02-2013, 07:31 PM   #1
Martyn W
 
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Country: uk
Location: Guernsey Channel island
Occupation: wholesale food sales
Interests: Burning fuel!!!
Boat name: The Magician, A Fine Pair
Boat make: ring20b, chriscraft stinger 26
Engines: merc XR2, 2X AQ311B 5.7's
Cruising area: channel islands

Join Date: Jul 2009
Location: Guernsey Channel island
Posts: 284
using raw water pump on alpha drive

I'v just bought a chriscraft stinger 26 that had merc 5.7 V8's on alpha drives, im going to use the drives but not the engines as 1 is knackered and the other doesnt look too good. so iv just picked up a set of volvo penta AQ311B 5.7's.

i know that all the bell housings, flywheels, clutch plates, ignition and manifolds will just swap straight over but was thinking about the volvo raw water pumps and if i could use them instead of the impeller on my alpha drives? is this possible and what are the pro's and con's of raw water pumps?

thanks
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Old 13-02-2013, 06:16 PM   #2
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Yeah do it, why not...at least if you do it and the drives explode and you sink we'll know the answer is NO! If it works you'll be making the world a better place.

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Old 13-02-2013, 07:07 PM   #3
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Country: UK
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Interests: Boats & Boats
Boat name: Kalaazar & " Side Winder "
Boat make: Fairline Targa 48, Magnum 27 Sport (1971)
Engines: Volvo 73P`s 430hp. Dart/Bontoft 383 ci`s
Cruising area: Poole Bay Etc

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Quote:
Originally Posted by martynwilley View Post
I'v just bought a chriscraft stinger 26 that had merc 5.7 V8's on alpha drives, im going to use the drives but not the engines as 1 is knackered and the other doesnt look too good. so iv just picked up a set of volvo penta AQ311B 5.7's.

i know that all the bell housings, flywheels, clutch plates, ignition and manifolds will just swap straight over but was thinking about the volvo raw water pumps and if i could use them instead of the impeller on my alpha drives? is this possible and what are the pro's and con's of raw water pumps?

thanks
It is the way to go. Remove the impeller from the drive, blank the water inlet into the boat then run a transom pickup to the engine mounted waterpump.
Better flow, bigger impeller which is now servicable from within the boat.

I have the same setup with Bravo 1 Drives and 383ci motors.

Ian Toll
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Old 13-02-2013, 07:26 PM   #4
Martyn W
 
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Country: uk
Location: Guernsey Channel island
Occupation: wholesale food sales
Interests: Burning fuel!!!
Boat name: The Magician, A Fine Pair
Boat make: ring20b, chriscraft stinger 26
Engines: merc XR2, 2X AQ311B 5.7's
Cruising area: channel islands

Join Date: Jul 2009
Location: Guernsey Channel island
Posts: 284
Thanks ian.
But I would really like to use the drives as pick ups as I don't really want anymore seperate pick ups, I already have tabs and will be adding drive showers so the back will be quite cluttered as it is. So do you think it is possible to just use the standard gearbox pick ups with no impella to feed the raw water pumps on the motors?
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Old 13-02-2013, 09:09 PM   #5
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Country: UK
Location: Poole Dorset, UK
Occupation: Company Director
Interests: Boats & Boats
Boat name: Kalaazar & " Side Winder "
Boat make: Fairline Targa 48, Magnum 27 Sport (1971)
Engines: Volvo 73P`s 430hp. Dart/Bontoft 383 ci`s
Cruising area: Poole Bay Etc

Join Date: Apr 2007
Location: Poole Dorset, UK
Posts: 132
Hi, in theory yes, a pick up is a pick up but I can`t remember the bore size of the water hose from the drive into the boat. However if you look at the OD size of the hose tail on the Volvo water pump versus the the pipe bore from the water inlet from the Transom plate if the hose fits the tail then it is not a problem but if the pipe is smaller don`t do it in case you starve the water pump at speed.

Ian Toll
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