water routing on 460 twin turbo?
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water routing on 460 twin turbo?

  1. #1
    Senior Member mercdrag 2.5's Avatar
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    Default water routing on 460 twin turbo?

    my brother just picked up a 1978 sanger super jet with a factory pfm 460 twin turbo, the boat is all stock as far as I know for the most part. my ??? is the water routing just dont seem right to me... it looks as if it dumping all the water out two 3/8's hoses into the exhaust after the turbos, we have ran about 20 gallons of gas threw it with no problems but just thinking it should also dump out the other openings in the manifolds and threw the hull?? it has been running a cool 150-180 in temp so..... any help would be great!! thanks tom
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    first of all, he should get rid of those exhaust pipes and send them to me

    I run from the pump...to ball valve with a T and a pressure relief valve (pressure relief goes through the hull)...to the exhaust manifold...out of the exhaust manifold...into the block...out of the intake...through the hull.

    I then have a water pick up under the boat.

    pick up...to the intercooler...out to the exhaust.

    This keeps the exhaust dry when idling and prevents water from coming back on you when in reverse.




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    Senior Member mercdrag 2.5's Avatar
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    ...his comes from the jet to the intercooler...to the exhaust manifalds...back to the block....out the intake to the back of the exhaust log....out a 3/8's hose threw the exhaust.

    just dont seem rite to me....thinking it should also dump out the other fitting on the back of the log then threw the side of the boat??

    ...the way it is now all the water goes out the 3/8's exhaust coolers??
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    Quote Originally Posted by mercdrag 2.5 View Post
    ...his comes from the jet to the intercooler...to the exhaust manifalds...back to the block....out the intake to the back of the exhaust log....out a 3/8's hose threw the exhaust.

    just dont seem rite to me....thinking it should also dump out the other fitting on the back of the log then threw the side of the boat??

    ...the way it is now all the water goes out the 3/8's exhaust coolers??
    sounds like a recipe for this:



    I am going to guess that is a lot of water pressure in the system to dump all that out of 2 - 3/8 holes.

    he still has to have water going to the back riser that the turbo sits. The system he has right now heats the water twice before it even hits the block. Granted, I don't think that type of intercooler has a true heat exchanger, so it probably isn't THAT big of a deal.

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    Actually...looking back over the pictures now as you describe it...he has it right...unless you want to get a separate water system for the intercooler...and considering its an ambient temp cooler...I don't think I would bother.

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    Senior Member mercdrag 2.5's Avatar
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    would it help it to remove this plug on both siides and dump them out the side of the boat??
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    Quote Originally Posted by mercdrag 2.5 View Post
    would it help it to remove this plug on both siides and dump them out the side of the boat??
    You certainly could...less water through the exhaust...but if it ain't broke...

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