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I know this has been beaten to death

  1. #1
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    Default I know this has been beaten to death

    BUT!

    trying a different water routing system. The options seem to be:

    1) watts regulator in between the pump and the engine
    2) pressure relief valve (like this (http://www.tractorsupply.com/agricul...g=1&rFlag=true with a T in between the pump and the engine, excess gets dumped
    3) a dump line from the intake manifold to one of these http://www.amazon.com/Watts-530C-Adj.../dp/B000936L24 and then overboard.

    #3 makes the most sense to me, should it?

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    Senior Member slow67's Avatar
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    Quote Originally Posted by terrible_buddhist View Post
    BUT!

    trying a different water routing system. The options seem to be:

    1) watts regulator in between the pump and the engine
    2) pressure relief valve (like this (http://www.tractorsupply.com/agricul...g=1&rFlag=true with a T in between the pump and the engine, excess gets dumped
    3) a dump line from the intake manifold to one of these http://www.amazon.com/Watts-530C-Adj.../dp/B000936L24 and then overboard.

    #3 makes the most sense to me, should it?
    #3 should be plumbed the same was as #2, because if you had a pressure spike it would still put all the pressure thru the block.

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    Quote Originally Posted by slow67 View Post
    #3 should be plumbed the same was as #2, because if you had a pressure spike it would still put all the pressure thru the block.
    but one of the reasons for a pressure spike would be the block not being able to evacuate the water fast enough...if there was another exit for the water, it would help tame that...no?

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    Senior Member Boat 405's Avatar
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    1/2" feed line to block. 5/8" transom dump from motor.

    Keep it simple. No regulators needed IMO. Can never over pressurize the block because the outlet is bigger than the inlet. By the way have you looked at the water ports in the block. They are huge. Been running both boats that way for years no problems.
    Boat 405.

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    Quote Originally Posted by widowmaker View Post
    1/2" feed line to block. 5/8" transom dump from motor.

    Keep it simple. No regulators needed IMO. Can never over pressurize the block because the outlet is bigger than the inlet. By the way have you looked at the water ports in the block. They are huge. Been running both boats that way for years no problems.
    Not really an option for me at this point

    This pic is a little old, I upgraded the engine hardline to 1/2inch, but you get the idea.


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    Senior Member Oldsquirt's Avatar
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    TB, I see a couple of problems with the outflow plumbing from your engine to logs. First, that looks to be -6 hardline. Originally that would probably have been 5/8" hose. More importantly, each of those lines should have its own connection to the intake manifold water crossover. By using a "T" fitting you have created another serious restriction in the outflow from engine, as that "T" isn't going to flow as much water as the two lines are capable of flowing together.

    Before you say you can solve the pressure problem with a regulator, remember that the regulator is going to do so by reducing water flow through the engine. This may cause you some big cooling issues, especially with a twin turbo set up.

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    Quote Originally Posted by widowmaker View Post
    1/2" feed line to block. 5/8" transom dump from motor.

    Keep it simple. No regulators needed IMO. Can never over pressurize the block because the outlet is bigger than the inlet. By the way have you looked at the water ports in the block. They are huge. Been running both boats that way for years no problems.
    It was recommended to me yrs ago to stay away from a regulator on the lower Colorado where we go because of all the sand in the water. We run a system like yours.

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    Quote Originally Posted by Oldsquirt View Post
    TB, I see a couple of problems with the outflow plumbing from your engine to logs. First, that looks to be -6 hardline. Originally that would probably have been 5/8" hose. More importantly, each of those lines should have its own connection to the intake manifold water crossover. By using a "T" fitting you have created another serious restriction in the outflow from engine, as that "T" isn't going to flow as much water as the two lines are capable of flowing together.

    Before you say you can solve the pressure problem with a regulator, remember that the regulator is going to do so by reducing water flow through the engine. This may cause you some big cooling issues, especially with a twin turbo set up.
    That is -6 line...It has since been replaced with -8...that is of course still not 5/8.

  11. #9
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    Quote Originally Posted by widowmaker View Post
    1/2" feed line to block. 5/8" transom dump from motor.

    Keep it simple. No regulators needed IMO. Can never over pressurize the block because the outlet is bigger than the inlet. By the way have you looked at the water ports in the block. They are huge. Been running both boats that way for years no problems.
    100 % correct... 1 #8 line to tee into block, 2 # 10 dumps .185 restrictor in inlet line, runs about 160 or so...zero pressure. I tap the #8 fitting 7/16 nc and then take a bunch of ss setscrews and drill different size holes to regulate temp..from .125 to .250 really works good and simple.

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    Senior Member Boat 405's Avatar
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    Quote Originally Posted by terrible_buddhist View Post
    Not really an option for me at this point

    This pic is a little old, I upgraded the engine hardline to 1/2inch, but you get the idea.

    Sure it is. Just run a -8 from the pump to the logs to be preheated. Then they go to the motor. When they come out the top run to the logs with -08 or larger to each side. Two -08 is almost the area of a -10 so you will be fine.

    As far as the intercooler is concerned run another feed line from the pump and go directly through the motor and then to an overboard dump line.
    Last edited by Boat 405; 05-27-2010 at 02:12 PM.
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  13. #11
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    Quote Originally Posted by widowmaker View Post
    Sure it is. Just run a -8 from the pump to the logs to be preheated. Then they go to the motor. When they come out the top run to the logs with -08 or larger to each side. Two -08 is almost the area of a -10 so you will be fine.

    As far as the intercooler is concerned run another feed line from the pump and go directly through the motor and then to an overboard dump line.
    you really think that T is the source of the pressure problems? I mean, I know its not helping as oldsquirt said. should I do a divider in the thermostat hole?

    The intercooler isn't an issue, that one is on its own system with a pickup under the boat.

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