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crossover with thermostat setup

Old 06-06-2012, 07:55 PM
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How did you setup your thermostat how many hole in them and what hole dia to be able to fill the block of water?
I have try a 140 thermostat with a 1/8 hole dia and the water temp is not stable, they are stable on throtle and when i back to idle the temp raise sudently to 200-220f i shut off the engine imediatly.
How do you make this setup reliable?
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Old 06-06-2012, 10:17 PM
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Originally Posted by supermx96
How did you setup your thermostat how many hole in them and what hole dia to be able to fill the block of water?
I have try a 140 thermostat with a 1/8 hole dia and the water temp is not stable, they are stable on throtle and when i back to idle the temp raise sudently to 200-220f i shut off the engine imediatly.
How do you make this setup reliable?
start off with a 3/16 hole in the tstat..i usually end up with 3 3/16 hiles in a triangle shape..are you running a bypass? the hose that goes to your t-stat housing to the crossover?
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Old 06-06-2012, 10:35 PM
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Originally Posted by mrfixxall
start off with a 3/16 hole in the tstat..i usually end up with 3 3/16 hiles in a triangle shape..are you running a bypass? the hose that goes to your t-stat housing to the crossover?
Yes i use bypass, with std thermostat (140F)with the hole that i have made in it (1/8'') it is look like that the cold water coming from the bypass affect the thermostat or they make some steam pocket for some reason ???
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Old 06-07-2012, 11:30 AM
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I would check your impeller and pump housing. If they are like new, then swap the thermostat for a Stewart high flow model. If you are using a stock thermostat, they won't react fast enough and flow enough when you drop off plane after a hard run. After running wide open and dropping off plane, my boat will rise as high as 190, but will drop quickly back to 160.
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Old 06-07-2012, 02:03 PM
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Originally Posted by mrfixxall
start off with a 3/16 hole in the tstat..i usually end up with 3 3/16 hiles in a triangle shape..are you running a bypass? the hose that goes to your t-stat housing to the crossover?
Also where do you drill the 3 hole?
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Old 06-08-2012, 01:17 PM
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Any help would be apreciated.

Thanks
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Old 06-09-2012, 08:26 AM
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i will try today the thermostat with 3 x 3/16 hole in triangle and aling the one hole on the top and the other two hole aling at the botom of the engine. I hope it will work!
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Old 06-10-2012, 07:13 AM
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You have other issues drilling holes is not going to help. You have an 80 degree swing. Your cooling system is not in control. You have a blockage somewhere that needs to be addressed.
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Old 06-10-2012, 07:21 AM
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ck your oil and P/S coolers for blockage..old impellor pieces etc..as well as the water pump itself...are testing in the water or on the hose ? sometimes they will suck a garden hose closed..
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