PFM twin turbo plumbing questions
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PFM twin turbo plumbing questions

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    Default PFM twin turbo plumbing questions

    I'm about to start plumbing my twin turbo motor and I was wondering how to plumb the water lines. I have heard some people are doing a secondary water source for the intercooler. Is it ok to come off the pump, through a strainer with a pressure relief, go through the intercooler, in the logs, out the logs, into the motor, out the motor, into the risers, out of the risers, into the turbo shields, out of the shields and out the exhaust. Any help would be greatly appreciated!
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    Quote Originally Posted by oliver1421 View Post
    I'm about to start plumbing my twin turbo motor and I was wondering how to plumb the water lines. I have heard some people are doing a secondary water source for the intercooler. Is it ok to come off the pump, through a strainer with a pressure relief, go through the intercooler, in the logs, out the logs, into the motor, out the motor, into the risers, out of the risers, into the turbo shields, out of the shields and out the exhaust. Any help would be greatly appreciated!
    The best situation is to plumb the intercooler separate, with a force fed pickup, making sure the outlets are greater than, or at minimum equal to the inlet lines.

    Strainer with pressure relief sounds fine for the engine, and the rest of the routing seems fine. Enter the lowest point and exit the higher point for each part.

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    Quote Originally Posted by obnoxious001 View Post
    The best situation is to plumb the intercooler separate, with a force fed pickup, making sure the outlets are greater than, or at minimum equal to the inlet lines.

    Strainer with pressure relief sounds fine for the engine, and the rest of the routing seems fine. Enter the lowest point and exit the higher point for each part.
    What is the the best way to get a secondary water source for the intercooler? If it is force fed will I need to regulate pressure going in?

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    Quote Originally Posted by oliver1421 View Post
    What is the the best way to get a secondary water source for the intercooler? If it is force fed will I need to regulate pressure going in?
    I don't know how your jet boat is set up. On V drive boats, it's most common to have a water pickup in the cavitation plate, with no pressure regulator, so it's critical to limit any back pressure in the intercooler circuit.

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    Quote Originally Posted by Hass828 View Post
    That looks to be a diagram from Gale Banks, perhaps almost 40 years old I think. If the system did not have an intercooler, I would agree with it, since those little "heat exchanger" boxes were just an air box with a water jacket around it, so would not have had any restrictive radiators.

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    Quote Originally Posted by obnoxious001 View Post
    That looks to be a diagram from Gale Banks, perhaps almost 40 years old I think. If the system did not have an intercooler, I would agree with it, since those little "heat exchanger" boxes were just an air box with a water jacket around it, so would not have had any restrictive radiators.
    That old draw through system that he is using is probably 40yrs old. My Banks system had the big stage V cooler simular to what he is using and it was plumbed like this schematic. Always worked perfectly.


    Last edited by Hass828; 02-04-2017 at 12:45 PM.
    "if we keep doing it the same way we always do..we will always get the same results"
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    Thanks guys! I've just heard people say that fuel will puddle up in the intercooler if it didn't have a force fed pickup. I talked to Bob Teague and he said to install a through hull pick up with no regulator and that should be fine for the intercooler by itself.

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    Quote Originally Posted by Hass828 View Post
    That old draw through system that he is using is probably 40yrs old. My Banks system had the big stage V cooler simular to what he is using and it was plumbed like this schematic. Always worked perfectly.
    I actually worked at Banks in the late 70's, and have a copy of the diagram. In the race applications that I have built turbos engines for, with either Gentry or the older style kits, I still like to see separate flow for the intercooler.

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    When I ran a pfm twin turbo system on my jet with the big intercooler, I plumbed the intercooler from the second water supply from my American turbine pump. I used a pressure regulator to keep water psi around 15psi.

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