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06-03-2013, 06:36 PM
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#1
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Registered User
Country: england
Location: surrey
Engines: none at the mo
Cruising area: south coast
Join Date: Dec 2011
Location: surrey
Posts: 472
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v6 thermostats
hi all, just wondered if anyone runs there v6 without thermostats, i know some engines need them to run warm and efficient, but would a v6 outboard run cooler, better water flow without them or do they need stats ?
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06-03-2013, 07:37 PM
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#2
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The Doc
Join Date: Mar 2004
Posts: 8,291
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Its not that simple an answer.
I think a lot depends on what sandwich plate you are using, whether your using a poppet (or its condition) etc.
From my understanding, the main reason the 'domestic/fishing' cooling system is in place is to ensure the steel bored block actually gets sufficient heat (expansion) to safeguard against a cold seize effect.
In opposition, the "Hi perf" Nicasil sleeved motors cooling system (no stats or poppet) is to ensure sufficient cooling at ++++++ Rpms.
I'm led believe mixing n matching the cooling systems is a bad idea. Waiting for other members to shoot me down here!
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07-03-2013, 06:30 PM
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#3
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Quote:
Originally Posted by Captain Chaos
I'm led believe mixing n matching the cooling systems is a bad idea. Waiting for other members to shoot me down here!
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100% agree, leave it alone unless you know what youre doing, as captain has said, its not as simple as just removing stats!
What motor is it?
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09-03-2013, 08:02 AM
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#4
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Registered User
Country: england
Location: surrey
Engines: none at the mo
Cruising area: south coast
Join Date: Dec 2011
Location: surrey
Posts: 472
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stats
Quote:
Originally Posted by Hydrostream
100% agree, leave it alone unless you know what youre doing, as captain has said, its not as simple as just removing stats!
What motor is it?
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engine is a 200 mariner, the engine pumps water well, but the water comming out is piping hot
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09-03-2013, 10:04 AM
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#5
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Registered User
Country: uk
Location: salcombe
Occupation: semi retired
Interests: racing(middle east class 3 6l)
Boat name: still no worries
Boat make: phantom18
Engines: 2.5 efi
Cruising area: salcombe
Join Date: Dec 2007
Location: salcombe
Posts: 499
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You have to run it for quite a while until the stats open, it's easy to think there's something wrong because the water is so hot, the xr2s/2.5 efis run washers with an 1/8 of an inch hole in place of the stats, don't just take the stats out because the stats/washers keep the water in the top of the powerhead (restricting the flow) keeping it cool.
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12-03-2013, 02:51 AM
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#6
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Trade Member
Country: United States
Location: South Texas. USA
Occupation: Own JSRE ( Jay Smith Racing Engines )
Interests: ACCELERATION (anykind )
Join Date: Jan 2006
Location: South Texas. USA
Posts: 244
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I leave the cooling systems in the engines I build alone, steel sleeve engines demand HEAT for proper expantion for clearance, making a steel sleeve engine run cool can be the "Kiss of Death"....
Jay @ JSRE
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12-03-2013, 02:57 AM
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#7
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The Doc
Join Date: Mar 2004
Posts: 8,291
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Jay, how would you cool a promax 225 thats on a 1 piece sandwich plate/ 20" OS midsection?
Ive done some reading over on S&F. From what I understand, going the 2.5efi cooling route is a must on a 1 piece plate, but in steel sleeve motors the holes in the base plate need reducing. I cant seem to ascertain why. I assume its to keep more water in the block and preventing steam pockets.
Any recommendations?
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12-03-2013, 12:20 PM
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#8
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Slow the water down to build heat.
Depends on the 2.5 plate. Ive seen them with tiny holes to almost half inch holes.
I like to drystack them, put the cooling outside the plate and then its easy to tune the water flow.
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12-03-2013, 09:34 PM
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#9
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Registered User
Country: England
Location: Crayford, Kent.
Occupation: Electrical gezza!
Interests: Petrolhead
Boat name: Wayne Kerr
Boat make: Phantom xl
Engines: Mercury 2.5, 200(ish)
Cruising area: Essex, Hampshire, Mediterranean
Join Date: Sep 2004
Location: Crayford, Kent.
Posts: 1,199
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I've run my 2.5 with the moving centre part removed for donkeys with no adverse effects.
The main body of the stat acts as a restrictor to maintain water pressure.
Having said all the above, I usually run the motor in warm (ish) seas.
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