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  1. #1
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    Default Temperature old 350 Chev

    Hi all, new to forum, can anyone tell me correct temperature range my 350 should be running at? The boats around 96 model and motor probably older, it runs a raw water pump into mce manifolds and block, be great to get some advise


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  2. #2
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    Quote Originally Posted by bcullen67 View Post
    Hi all, new to forum, can anyone tell me correct temperature range my 350 should be running at? The boats around 96 model and motor probably older, it runs a raw water pump into mce manifolds and block, be great to get some advise


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    200F is normal. 220F is a bit warm.
    The boat I just built runs constantly 210F but I need to keep the revs up.
    The temp creeps up at anything below 3000rpm.
    I ordered a bigger raw water pump last week to try and get more water running through it at knee/wake boarding speed.


    Get a temp gun to see what the boats doing, the coolings not a closed circuit so the temp sender mightnt be a lil off.

  3. #3
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    Thanks heaps mate! I知 running between 180 & 200, I was worried it was a bit high, I just bought the boat so been checking impeller and all plumbing because I was worried, I can chill out and enjoy now, cheers


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  4. #4
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    Operating temp will depend on the type of cooling system you have...
    1) closed with heat exchanger
    2) open with thermo control (thermostat)
    3) open no thermo control (no thermostat)

    200-200F is ridiculously hot. 160-180F is ideal.
    Closed with heat exchanger is used by the leading marine engine manufacturers on their high end engines. For reference, PCM run their ZR409 & ZR450 at 175F. Pressurised system with coolant. Very fast warm up and long engine life.
    Open with thermo control will run at whatever thermostat you put in it. KM Rolco recommend a 60C (140F) in their kits. I personally use a 71C (160F). Quick warm up. Fairly constant temps. Cost effective.
    Open without thermo control is the most basic set up and just pushes cold water straight through the block (after pre-heating a bit in the exhaust manifolds) without giving the engine a chance to build any heat. You'd be lucky to see 60C. Temp is never constant. Engine runs too cold.

  5. #5
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    Quote Originally Posted by ski351 View Post
    Operating temp will depend on the type of cooling system you have...
    1) closed with heat exchanger
    2) open with thermo control (thermostat)
    3) open no thermo control (no thermostat)

    200-200F is ridiculously hot. 160-180F is ideal.
    Closed with heat exchanger is used by the leading marine engine manufacturers on their high end engines. For reference, PCM run their ZR409 & ZR450 at 175F. Pressurised system with coolant. Very fast warm up and long engine life.
    Open with thermo control will run at whatever thermostat you put in it. KM Rolco recommend a 60C (140F) in their kits. I personally use a 71C (160F). Quick warm up. Fairly constant temps. Cost effective.
    Open without thermo control is the most basic set up and just pushes cold water straight through the block (after pre-heating a bit in the exhaust manifolds) without giving the engine a chance to build any heat. You'd be lucky to see 60C. Temp is never constant. Engine runs too cold.
    Hi mate, thanks for the detailed information! I値l rip the thermostat out today and see what I知 dealing with, temp gauges showing the same on both sides of the block so I知 assuming there are no blockages in plumbing after manifolds, have checked impeller and all good, hopefully I値l get it down a bit lower with a new thermostat, thanks again, cheers


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  6. #6
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    Hi again, I went up to Eildon to replace thermostat today, only problem was when I removed cover I discovered the previous owner had removed thermostat all together, installed. 160 degree thermostat but starting to think something else might be going on, any suggestions as to what may be occurring ? Cheers


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  7. #7
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    You can't just stick a thermostat in it if it doesn't have a "thermo control" system. You will do more harm than anything because you will shut off all flow.
    The thermo control incorporates a thermostat but with the addition of a one-way valve in the housing and re-plumbing of the hoses. When the thermostat is closed during warm up water will continue to flow out the exhaust. When the thermostat opens the one-way valve stops warm water from re-entering the block. Water must always flow out the exhaust...thermostat open and closed.
    If it doesn't have something that looks like this (link below) it's just a basic open set up (option 3 above).
    (Note: the MCE brand thermo control does the same job as the one below but looks completely different).
    Thermo Control Kit - Chev Small Block Timing Case Drive (R) | Cassell Marine

  8. #8
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    Quote Originally Posted by ski351 View Post
    You can't just stick a thermostat in it if it doesn't have a "thermo control" system. You will do more harm than anything because you will shut off all flow.
    The thermo control incorporates a thermostat but with the addition of a one-way valve in the housing and re-plumbing of the hoses. When the thermostat is closed during warm up water will continue to flow out the exhaust. When the thermostat opens the one-way valve stops warm water from re-entering the block. Water must always flow out the exhaust...thermostat open and closed.
    If it doesn't have something that looks like this (link below) it's just a basic open set up (option 3 above).
    (Note: the MCE brand thermo control does the same job as the one below but looks completely different).
    Thermo Control Kit - Chev Small Block Timing Case Drive (R) | Cassell Marine




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  9. #9
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    Quote Originally Posted by ski351 View Post
    You can't just stick a thermostat in it if it doesn't have a "thermo control" system. You will do more harm than anything because you will shut off all flow.
    The thermo control incorporates a thermostat but with the addition of a one-way valve in the housing and re-plumbing of the hoses. When the thermostat is closed during warm up water will continue to flow out the exhaust. When the thermostat opens the one-way valve stops warm water from re-entering the block. Water must always flow out the exhaust...thermostat open and closed.
    If it doesn't have something that looks like this (link below) it's just a basic open set up (option 3 above).
    (Note: the MCE brand thermo control does the same job as the one below but looks completely different).
    Thermo Control Kit - Chev Small Block Timing Case Drive (R) | Cassell Marine




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  10. #10
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    I think it does, doesn稚 look like that but thermostat cover has three hoses connected, one from water pump and two that lead Bach to a branch connecting to the exhaust,



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  11. #11
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    Just attached a pic, cheers


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  12. #12
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    That's the MCE thermo control so should have a thermostat.
    I don't have any experience with that system. Principle is the same though.
    Found a plumbing diagram for it... (third pic)
    Plumbing water on your ski boat

  13. #13
    Senior Member TonnerGuy's Avatar
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    No expert in boat cooling systems, but have you checked the impeller condition of the water pump, as stated in that instructional info.

    Recommend all boat owners to fit a water strainer filter system before the water pump to eliminate the possibility of ingestion of gum nuts,weed or any other rubbish in the water that could ruin the water pump impeller.
    Remember if you cannot run your hand along the outside of the exhaust manifolds while the engine is ideling most likley the pump is not operating correctly and requires investigation.

  14. #14
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    Hey guys take a look at this distribution valve, does anyone know what the 218 represents? 218 degrees Fahrenheit ?


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  15. #15
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    Temp...No. 218F is 103C
    Most likely a part number

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