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Old 06-03-2013, 07:36 PM   #1
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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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Old 06-03-2013, 08:37 PM   #2
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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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Old 07-03-2013, 07:30 PM   #3
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Quote:
Originally Posted by Captain Chaos View Post
I'm led believe mixing n matching the cooling systems is a bad idea. Waiting for other members to shoot me down here!
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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Old 09-03-2013, 09:02 AM   #4
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stats

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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?
engine is a 200 mariner, the engine pumps water well, but the water comming out is piping hot
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Old 09-03-2013, 11:04 AM   #5
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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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Old 12-03-2013, 03:51 AM   #6
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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"....

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Old 12-03-2013, 03:57 AM   #7
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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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Old 12-03-2013, 01:20 PM   #8
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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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Old 12-03-2013, 10:34 PM   #9
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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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