Thermostat question....
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Thermostat question....

  1. #1
    Member Dano214's Avatar
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    Default Thermostat question....

    I have a small block chevy 5.7L volvo penta set up with a AQ280 drive, and in the process of replacing the intake manifold i found out the the previous owner was not running a thermostat. So my question is should i be running one? If so were and what should i be running? I know in the last couple jet set ups I had I never ran one but i know thats a different set up than this is.
    Thanks

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    I,m no expert But is it a closed or open system ?? I,m thinking you would want to run one in a closed set up
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    Sorry it is a open system (raw water) has the sea pump and the circulating pump. Its a older set up volvo penta aq255 5.7L

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    Site seems a bit slow today lol I,m sure some one well come along with much more knowledge than i have :P

    what kinds of temps did you see without the thermostat ? Was it running cold or hot ?
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    Its running to cold for what i think or have heard it should run, about 130-140 if the gauge is correct.

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    For shit and giggles i goggled , Ideal water temp for a big block chevy ?

    Guess what the first link it gave ??

    http://www.performanceboats.com/dyno...oil-temps.html
    120 ???

    A 2 year old thread on this board lol . Not sure i agree with the old thread , I,m thinking 180 220 would be normal temps

    I can bet this well bring a few more replies to this thread ;D
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    Senior Member SoldHondaBoughtHondo's Avatar
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    Everybody has their own opinion and mine runs about 160* water and 200* oil.
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    Member Dano214's Avatar
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    After doing some research on this motor on a volvo penta site, It was originally equiped with a 160* thermostat. So i guess i need to figure out were to get one......

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    Senior Member carreradude's Avatar
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    Any auto part stores should have a 160* stat. Just make sure it fits in the intake "pocket" correctly.
    Also, make sure water still flows thru the exhaust when the thermostat will be closed. Someone may have replumed it to run without the stat in place and could melt rubber exhaust connections and put your boat on the bottom of a lake.

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    Member Dano214's Avatar
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    Got it! that would ruin a good weekend so i don't have to run a special "marine" thermostat?

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    The only difference between a "marine" thermostat and some from the auto parts store is the material the housing is made of. A marine thermostat should be made out of stainless steel.

    I don't know if the same is true of thermostats from the auto parts store, but you can find out pretty easily by trying to make it stick to a magnet. If it sticks, walk away.

    In closed cooling, the thermostat will only corrode as much as the water in the cooling system will allow before it becomes oxygen deprived. That never happens with raw water cooling due to a constant supply of non-stagnant water.

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