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  1. #1
    ricky86's Avatar
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    has anyone dual cooling lines in his openloop system

    hi, i was wondering if anybody has dual cooling line on a 4 tec with openloop by tapping into the pump and put a cooling hose true the transom. i know a german guy does it on his cc race boat but was wondering if anybody else does it.

    i must mention it's for a race boat and not for a rec boat. i know the riva kit runs great on rec boats but are there any real high performace boats that runs a different setup??

    thanks

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ID:	282376it's not the bleu hoses i'm talking about but the big black one.


  2. #2
    2000 GPRXP 4tec shooter98xpl's Avatar
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    They do that on the yamaha pump setups on the gprxps which is basically what you have here. If you go to the conversion section you can see the different variations of dual water routings that people have posted.
    SHOOTER

  3. #3
    boost junkie skidoochris's Avatar
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    Do you run a open loop in real cold water?
    That black hose is taped into the same water feed just before the restrictor washer
    IMO seems easier just to remove the restrictor and T the hose inside the boat for more than enough flow
    with no extra holes on the hull/shoe

  4. #4
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Quote Originally Posted by skidoochris View Post
    Do you run a open loop in real cold water?
    That black hose is taped into the same water feed just before the restrictor washer
    IMO seems easier just to remove the restrictor and T the hose inside the boat for more than enough flow
    with no extra holes on the hull/shoe
    Couldn't agree more. The pump flows more than enough to do the job. Easier to split it up once it's inside the hull.

  5. #5
    ricky86's Avatar
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    Quote Originally Posted by skidoochris View Post
    Do you run a open loop in real cold water?
    That black hose is taped into the same water feed just before the restrictor washer
    IMO seems easier just to remove the restrictor and T the hose inside the boat for more than enough flow
    with no extra holes on the hull/shoe
    i run in 50 f to 80 f watertemps

  6. #6
    boost junkie skidoochris's Avatar
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    Quote Originally Posted by ricky86 View Post
    i run in 50 f to 80 f watertemps
    I run a 20 plate heat exchanger in 80f water and temp never goes above 160 with the 160f t-stat at wot
    for long idle times it may get near 170
    my point is keeping the whole motor up to temp and at a constent temp is better for tuning and motor life
    on a 160f motor 50f water entering the block has to create cold spots
    my point is why pump crap (raw water) threw your motor when there is a much better option
    and another good thing with the closed loop, you can see if the motor is using/leaking coolant
    the total extra weight (not much) is IMO worth every pound


  7. #7
    ricky86's Avatar
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    Quote Originally Posted by skidoochris View Post
    Quote Originally Posted by ricky86 View Post
    i run in 50 f to 80 f watertemps
    I run a 20 plate heat exchanger in 80f water and temp never goes above 160 with the 160f t-stat at wot
    for long idle times it may get near 170
    my point is keeping the whole motor up to temp and at a constent temp is better for tuning and motor life
    on a 160f motor 50f water entering the block has to create cold spots
    my point is why pump crap (raw water) threw your motor when there is a much better option
    and another good thing with the closed loop, you can see if the motor is using/leaking coolant
    the total extra weight (not much) is IMO worth every pound
    i understand your point. i do cc racing and run the riva ride plate with the riva open loop and want to keep it open loop.

  8. #8
    ricky86's Avatar
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    i want to run 2 hoses 1 for the exhaust system and 1 for the intercooler+motor to keep my exhaust as cool as possible. but i don't know if it will make a big difference if i run a extra line that doesn't go true the intercooler first but comes directly from the pump

  9. #9
    boost junkie skidoochris's Avatar
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    what size/color restrictor washer are you using?
    water flow is all about restrictions
    the water will go where there is the least restrictions
    when I split my flow I used a X T because it has a built in restrictor
    also if you use a strainer it is also a big flow restrictor

  10. #10
    ricky86's Avatar
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    i have a strainer and i use a yellow restrictor

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