Cooling supercharged 350 Chevy
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Cooling supercharged 350 Chevy

  1. #1
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    Default Cooling supercharged 350 Chevy

    I have just fitted a new motor to my jet boat. Its a 350 Chevy with a 671 Weiand blower running at a low 6-8 psi boost. Its not a race boat but I do like to put the pedal down now and then. What is the best method for me to cool my motor? Raw water? Water pump or no water pump? Thermostat or no thermostat? Any ides appreciated. P.S Its not really common practice to run blowers in family boats here in New Zealand so I am looking up to you Americans to steer me in the right direction!
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    Last edited by Huffa; 10-07-2012 at 02:12 AM.

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    any of my supercharged motors(these were big block applications) we cooled by eliminating the waterpump and adding a crossover. We ran without a t-stat. The t-stat was replaced with restricter plates(basically washers with different sized holes).

    on another note does your exhaust flow pretty well ? more flow in = more flow out
    Last edited by hotbeek; 10-07-2012 at 06:34 AM.

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    Senior Member tkriley13's Avatar
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    Quote Originally Posted by Huffa View Post
    I have just fitted a new motor to my jet boat. Its a 350 Chevy with a 671 Weiand blower running at a low 6-8 psi boost. Its not a race boat but I do like to put the pedal down now and then. What is the best method for me to cool my motor? Raw water? Water pump or no water pump? Thermostat or no thermostat? Any ides appreciated. P.S Its not really common practice to run blowers in family boats here in New Zealand so I am looking up to you Americans to steer me in the right direction!
    I dont think you want to run a thermostat especially in a blown deal due to the chances of creating steam pockets .. Doesnt the Jet supply the water to the engine? Also the exiting water I`d run (2) -8 lines so you dont restrict the exiting watering.. For a N/A deal you could run a REX Marine thermostat deal and those work correctly unlike choking the exiting water to create temp within the engine..JMO

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    Senior Member jetboatperformance's Avatar
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    Water off the jet drive feed to a T and into the engine at the water inlets on the sides of the timing cover, take water out the top/front of the blower manifold and (split) and into your center rize exausts up thru the rizers and out to the lake , no T stat no water pump, Cant see what manifolds you have and how exactly they are configured to be plumbed more pics of the front of the intake as well as the manifolds would help there could be some "pre heat" options available to you Tom

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    Senior Member SoldHondaBoughtHondo's Avatar
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    V-drive water pump...no t-stat...no valves to adjust less plumbing.
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    Ok thanks guys. Will get some more pics later as just about to head off to work. I realise that the jet can supply m ore than enough water, just that a lot of people her frown upon dumping cold water directly into the motor. I used a water pump system on the old motor and it worked well but room is the factor here so I guess if thats the way all you guys do it over there it cant be bad. Heres the old system
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    Too dark to get pics of ex manifolds but I had this one of the inlet. The exhausts are Kodiaks. I dont think it wouldnt be possible to pre heat water the way they are set up-no hose tail on the riser. Also got some pics of the Rex unit I have. Would it be on to gut this and modify and run it without a thermostat?
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