[Question] water pressure in block
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water pressure in block

  1. #1
    Broke Member monstertahiti78's Avatar
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    Default water pressure in block

    does anyone know what the normal water pressure is supposed to be in a 454?

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    What is the reason for the question in the first place?

    Not really sure if there is a normal water pressure. I know in a closed system as in a car for instance it is about 12-15psi. Something in that area or lower should be Ok. You would want some positive pressure in order to prevent air pockets from being formed in the engine.

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    Senior Member Bigblockbill's Avatar
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    I bet a jet has a whole lot more than 12-15psi when running hard.
    24' Eliminator Fundeck

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    Senior Member H20MOFO's Avatar
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    I had less than 10 sat. at wot...assuming my gauge is accurate. With the gate valve wide open I have seen 30 plus on the same gauge.
    Another Hot Boat refugee

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    Hoodys and swim trunks Elkidminoltu's Avatar
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    I see less than 5psi at WOT in my small block jet. Mechanical gauge mounted on the intake manifold of the motor.

    You can purchase a T-stat kit if you're worried about running the boat at a good operating temperature while still maintaining proper flow internally.

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    Senior Member Boat 405's Avatar
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    Under a full throttle in my 21 daytona at just under 100mph. I see about 12 psi in the block. -08 inlet. -10 oulet. As long as it is plumbed correctly you should not see more than 15
    Boat 405.

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    AKA OhOneWS6 Last Mohican's Avatar
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    Quote Originally Posted by Bigblockbill View Post
    I bet a jet has a whole lot more than 12-15psi when running hard.

    Much more than that and you can start pushing out head and intake gaskets.

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    Senior Member jet pilot's Avatar
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    Quote Originally Posted by fastmarlene View Post
    What is the reason for the question in the first place?

    Not really sure if there is a normal water pressure. I know in a closed system as in a car for instance it is about 12-15psi. Something in that area or lower should be Ok. You would want some positive pressure in order to prevent air pockets from being formed in the engine.
    yes, most stock engines run 12-16 psi, my 454 I see about 10-12 on the water pressure gauge installed on the manifold...

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    Broke Member monstertahiti78's Avatar
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    Quote Originally Posted by fastmarlene View Post
    What is the reason for the question in the first place?

    Not really sure if there is a normal water pressure. I know in a closed system as in a car for instance it is about 12-15psi. Something in that area or lower should be Ok. You would want some positive pressure in order to prevent air pockets from being formed in the engine.
    I checked out a system the other day and the guy had his boat set up with 2 dumps in which he could shut one off manually. While we were out on the water he was running with both dumps open but at one point he closed one dump and the pressure gauge on the top of the manifold skyrocketed. from what i could tell it seemed like with both dumps were open, the system was running around 20-30psi and when he closed the secondary dump the psi nearly doubled at half of the rpm. I know that 2 dumps are not necessary but if I can get a longer life out of the engine by having less water pressure then id prefer to go that route. just not totally sure what a good medium is to work off of.

    Nate

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    Quote Originally Posted by monstertahiti78 View Post
    I checked out a system the other day and the guy had his boat set up with 2 dumps in which he could shut one off manually. While we were out on the water he was running with both dumps open but at one point he closed one dump and the pressure gauge on the top of the manifold skyrocketed. from what i could tell it seemed like with both dumps were open, the system was running around 20-30psi and when he closed the secondary dump the psi nearly doubled at half of the rpm. I know that 2 dumps are not necessary but if I can get a longer life out of the engine by having less water pressure then id prefer to go that route. just not totally sure what a good medium is to work off of.

    Nate
    Nate, it would be a good idea to install a gate valve coming off the pump to regulate the water pressure. With 30+ PSI your asking for trouble. Try to keep it under 20psi.

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    Quote Originally Posted by Last Mohican View Post
    Much more than that and you can start pushing out head and intake gaskets.
    30+ and my milkshake brought all the boys to the yard.


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    Senior Member bp298's Avatar
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    recently, a friend of mine installed one of those bypass relief deals on the main cooling line, downstream from the pump. he had a pressure gauge on the dash. took the thing out and when he went wot, pressure gauge pegged even though the relief bypass was wide open. he immediately got out of it. pressure gauge only goes to 60 psi, so no telling how high block pressure really got to. and yes, it was plumbed correctly. but, the engine had over 1300hp - twin turbo deal.

    a ball valve can be used to try and control flow rate/pressure. multiple dumps can be used. but like my friend, a lot of people simply install a regulator that will control outlet pressure to 5-15psi. i've been using the same regulator for 15 years, keeps pressure under 10 psi all the time. plenty of flow rate at idle and at wot. no extra dump lines, no t-stat kits with extra hoses running all over the place. simple...

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    Do you have a part number for that regulator or where to get it? I'm having the same issue? Thanks

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    Go to cpperformance.com. search pressure relief valve. Goes off your pump. Then you can get another pressure relief vavle that goes from the water outlet on the intake manifold that would control the flow to your headers....

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