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  1. #16
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    ball valves are 1/4 turn, gate valves are like the out door faucts.
    Never restrict the discharge, you will over pressure the block doing so! The jet pump is capable of over 300 psi on the inlet. Duanes info is solid info
    79 Southwind Tunnel Dragster 540ci BBC

    UMPBA 926 Gas Jet

    My Projects http://s200.photobucket.com/user/Dir...?sort=3&page=1

  2. #17
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    Quote Originally Posted by boatermike View Post
    the valve on the outlet side would build pressure in the engine. the water passages in a car engine and the gaskets in those passages are not designed to hold 200 psi. the radiator cap on a typical car is how many psi? i would not recommend adjusting the appliance this way. many threads exist on this subject.most of all realize many stock jets had no valves at all
    12psi?

    Im not disagreeing with you, Im not familure the heating and cooling of automobile engines, just with systems that i instal at work. If there are poor gaskets that are not meant to handle more then 20psi then yes restricting the outlet could result in a blow out.



    what is the pumping pressure of the pump supplying the cooling system? in a perfect world the gaskets should have a 50% safety factor ontop of the max pumping prssure he pump could supply to the system

    again not directly regarding automobile engines but with regardes to other heating and cooling systems

    jay
    89 charger-93 merc 2.5L 245hp
    Soon to be MAD EFI!



  3. #18
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    Quote Originally Posted by sleekcrafter View Post
    ball valves are 1/4 turn, gate valves are like the out door faucts.
    Never restrict the discharge, you will over pressure the block doing so! The jet pump is capable of over 300 psi on the inlet. Duanes info is solid info
    This is why plumbers and pipefitters dont run rad shops on the side i guess as the same theory is not involved in the cooling/heating systems
    89 charger-93 merc 2.5L 245hp
    Soon to be MAD EFI!



  4. #19
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    Ok maybe this is easier> here is the inlet from left side of the boat (drivers side)




    And here at the bottom you will see the outlet> The tap is off to the bottom of the headers kinda hiding lol It exits straight out of the boat at the back in a stream of water. This help lol






  5. #20
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    Oct 2009
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    You're loooking at the situation wrong. If it were an appliance, you are aboutely correct. BUT, this is an engine with a high pressure jet pump behind it. The difference here is that you have an over abundance of water already coming to the engine. So unlike a pump, you are not starving the engine. Even though you are slowing the flow down, there is still more water than needed. We've been through this many times on these boards. Many argue that it should be a ball valve because they flow more water. They do, I agree, but we are tryin to flow less water here so that it will stay in the engine long enough to heat it up. Duane HTP
    Last edited by Duane HTP; 12-13-2009 at 10:45 PM.

  6. #21
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    i stand corrected, and a ball valve deffinatly should not be used to throttle ever. a gate valve is borderline as it can chatter and fail. Globe valve is kinda outta the question as even fully open it has a sevearly restricted passage.

    jay
    89 charger-93 merc 2.5L 245hp
    Soon to be MAD EFI!



  7. #22
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    Did my pics show up? I cant see them now

  8. #23
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    I'd listen to Duane, he's been at this game a long time... It's what he does for a living. He's a regular on a couple of the Jet specific forums I hang out on, and a hell of a nice guy....

    Gary B>

    GaryB> Darskide's Calling
    '86 Eliminator Daytona/225 Excel in V-6 Special "Now hitting 90!!"

  9. #24
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    So i assume the moral of the story is adjust the outflow to regulate the heat for the engine and leave the inlet wide open? What temp should the engine be running at so its not too hot?

  10. #25
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    Jul 2009
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    Roseneath ontairo canada
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    Quote Originally Posted by Duane HTP View Post
    Be careful with this advise. By doing it this way, it is very easy to over pressure the water system of the Jet Boat and blow out gaskets or force water into the oil. You set the amount of water coming into the engine by adjusting the the valve on the inlet side. That also helps control the temperature. The only time you would squeeze down the outlet water would be if everything was working properly and you were trying to make the Bassett valve give water to the headers a little erlier.
    Duane HTP

    NO DO NOT ADJUST THE OUTLET!!!!!!!!Turst me, been there done it. By the time in knew it, my motor had about five extra liters in my oil pan and no it was not oil. It was water, witch went buy a set of ban new head gaskets. Cost me a crank, set of rods, spun number three main bearing. To fix my motor had to buy new crank, rods, new bearing, get the crank & rods blanced, new billet 4 bolt main caps, line bore and hone & gaskets. NOT TO MENTION THE TIME, THAT I COULD NOT BE OUT IN MY BOAT.

  11. #26
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    Whoa there fella. I said i stood corrected and i also explained why i suggested what i did in the first place.

    clear?
    89 charger-93 merc 2.5L 245hp
    Soon to be MAD EFI!



  12. #27
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    pics

    hey rollinstrapped, try those pics again , would like to see your new boat including the valve in question.

  13. #28
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    HI-Tech Performance sells a kit that gets rid of the extra pressure from the pump and still keeps a nice flow of water to the motor.

    I ran one on my last boat with a blown 1000hp 540 and it worked great!

    Had good engine temp and no spikes or swings in temp all day on the river

    Here is a link if anyone is interested
    http://www.hi-techperformance.com/HPParts.HTM

    Its 3/4 the way down the page "Water Bypass Kit"

  14. #29
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    Here is the only pic i have of my new boat right now hooked up to my denali



    Here is the outlet on the motor passenger side right hand side of the motor,Its hiding just under the header to left bottom













    This is the inlet of the motor

  15. #30
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    Jul 2006
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    Man do not restrict the outlet flow.You will have H2o running out the valve covers....I have a bypass on my inlet...If the pressure goes above 15psi it lets the excess out another outlet....If you have a bypass like me then you can play with the outlet water to regulate temp....b cool dude....
    79 Wriedt Maverick
    Blown 454
    Berk JF-A pump
    07 Bennington 5.0
    98 Yamaha XL1200

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