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  1. #1
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    low water pickup? is hull-mounted pickup possible?

    so, a TRS style pickup provides enough water to make 600 cubic inches happy while at full throttle. is there any reason that pickup can't be plumbed into a high perf outboard that has half the bullet above the surface at speed when the engine needs coolant the most? usually my brilliant ideas either turn out to be stupid or already common practice.

  2. #2
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    so, does the water pump feed the mid-section and water goes up through the base gasket? or does the water tube connect directly the powerhead? tryna figure out how to plumb this.

  3. #3
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    https://bobsmachine.com/product/tran...kup-90-degree/

    They feed the water pump through the side of the lower unit, just like their nose cones do.
    Last edited by David - WI; 04-02-2023 at 03:13 PM.

    Let's just go ahead and make America great again!

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  5. #4
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    https://www.nlamarine.com/products/m...ant=1212768360 the common TRS pick up. and it wouldnt have to go thru the hull. just up the back side of transom and put a check ball so it only feeds when incoming water pressure is higher than impeller pressure. that way it won't lose water pump pressure out the transom pick up. also may help keep sand out of the motor. the bob's setup David posted above is what i had in mind.
    Last edited by derekfl; 04-02-2023 at 11:03 AM.

  6. #5
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    I've been trying to stay away but, Can't any longer. First off you'll be better off with a nose cone low pick up. If you insist on hull pick up feed the gearcase before the water pump. No check valve BS. If you think you'd rather have a check valve and feed powerhead directly you'll need to take into account how to keep lube in gearcase after you melt your water pump. Also you need to account for the negative effect of dragging the hull pick ups thru the water. Drag and potentially turbulence on the prop.

    Old salty geezers two cents.
    Jim

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    Did you read this whole thing? Should answer everything.

    https://www.screamandfly.com/showthr...hlight=Transom

    Let's just go ahead and make America great again!

  8. #7
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    ...you don't want to use a check valve. never put a water pickup through the bottom of the boat. transom mount only. if design & installed height & placement is correct, there is no drag or slipstream interference worth talking about...
    Last edited by FUJIMO; 04-02-2023 at 07:21 PM.

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  10. #8
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    Lets get more specific. I agree there is no drag worth talking about in many cases. The faster you go the more significant the drag can be. At 100 a 1/16 of an inch of water pick up exposure can translate to 6 or 7 miles an hour. I learned that in a real world, real time test.
    My opinion against checked valves in water supply systems is based on numerous incidents of debris wasting time or ruining the day. Its proved to me a given a check valve will eventually ruin your day.
    I have no issue with a pick up helping with low water pressure on a race boat when used with low water pick ups on the gearcase. I would never suggest a hull pick up instead of low water pick up on a gearcase.
    Jim

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    I remembered another lesson about slip stream learned many years ago. On a 125 mph #6 drive boat the water pick ups mounted in the hull about 12 inches forward of transom would aerate the props that were swinging in whenever you turned the wheel. The same boat with the same power eventually went 140 mph the following year with a few water system changes.
    Jim

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  13. #10
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    Take a close look at the water pick-up. I have tried everything on outboards and nothing is as effective and hassle free as this. The strainer, blow-off valve, check valves, thru hulls, bolt ons everything has been done on my stuff over the years.




    Click image for larger version. 

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    Joe

  14. #11
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    I can't see your water system. Boat looks real nice.
    Jim

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    Is it that add on piece on gear housing? Hard to see.
    Jim

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    ...i deleted my first post response, because i got off talk'n fast offshore sterndrive stuff too jim...lol. lotz of background there as well, but the op is refering to o/b's. i think joe's point, with his picture, is that there is NO remote pickup, as it is the best way to go. i agree with this, for fast calmer water outboards. no remote needed. which is, i guess, what the op is setting up. for offshore, well...we can talk about that too...

  17. #14
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    I too, if it wasn't clear, am not a fan of remote pick ups. Not a fan of check valves either.

    There were many years ago triple outboard offshore boats that utilized remote pick ups to supplement water pressure. I was never convinced it was a faster approach to the issue at hand. I remember one boat in particular that had its engines mounted so high it didn't want to turn. What good is a few extra mph if you can't turn?
    Jim

  18. #15
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    Quote Originally Posted by Jim Speros View Post
    I too, if it wasn't clear, am not a fan of remote pick ups. Not a fan of check valves either.

    There were many years ago triple outboard offshore boats that utilized remote pick ups to supplement water pressure. I was never convinced it was a faster approach to the issue at hand. I remember one boat in particular that had its engines mounted so high it didn't want to turn. What good is a few extra mph if you can't turn?
    All of it is a waste if you don't have a strong hydraulic jack plate. A good water pick-up system is only good if you can utilize it by raising the motor height. Every outboard that I own have two things 1. Porta bracket and 2. good water pick-up ability.--you only need them if you want to be fast.

    Joe

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