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Old 10-07-2012, 07:54 AM   #21
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All I know is that after my 2200 mile 3 month trip this summer I had nothing at all inside my water strainer basket. Much of the time I was in 6 feet of water that was loaded with weeds. In fact I had to stop and go into reverse many times on the trip to clear the weeds off the prop.
So my strainer system works good enough.
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Old 10-07-2012, 09:12 AM   #22
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Guilty as charged M'lord, I throw myself on the mercy of the court.
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Old 10-07-2012, 09:22 AM   #23
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All I know is that after my 2200 mile 3 month trip this summer I had nothing at all inside my water strainer basket. Much of the time I was in 6 feet of water that was loaded with weeds. In fact I had to stop and go into reverse many times on the trip to clear the weeds off the prop.
So my strainer system works good enough.
do you have externals and if so what kind?
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Old 10-07-2012, 12:42 PM   #24
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do you have externals and if so what kind?
I have a "scoop strainer" like Coot's and it's facing forward.
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Old 10-07-2012, 02:32 PM   #25
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IN Florida the "best" intake has no intake cover.

The concept is to have the hose easily detachable at 3 or 4 ft into the boat , preferably slightly above the WL..

There should be enough room to disconnect the hose and ram a broomstick in and out with vigor. A basket strainer must be before the engine , no rule it must be on the seacock.

Beware many of the jelly fish parts will still sting even after they are mashed , so use a dedicated stick !

This is also good for sinks where grease might slow the flow.
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Old 10-07-2012, 06:13 PM   #26
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IN Florida the "best" intake has no intake cover.

The concept is to have the hose easily detachable at 3 or 4 ft into the boat , preferably slightly above the WL..

There should be enough room to disconnect the hose and ram a broomstick in and out with vigor. A basket strainer must be before the engine , no rule it must be on the seacock.

Beware many of the jelly fish parts will still sting even after they are mashed , so use a dedicated stick !

This is also good for sinks where grease might slow the flow.
My method for now...still holding my breath as to it being the best method....
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Old 10-08-2012, 01:22 AM   #27
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Guilty as charged M'lord, I throw myself on the mercy of the court.
Andy, did someone forgot to remove and antifoul inside the intake last time?
I hope your co-owner is recovering from what (see your post elsewhere) looks like a nasty ankle/heel injury. Ouch. BruceK
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Old 10-08-2012, 01:57 AM   #28
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There are eleven holes in the bottom of our boat. Eight of them are intakes and they all have the perforated bronze plates over them.
The fewer the better. The Coot has one intake. A manifold (as pictured in post #9) would reduce the number. The Coot has two unused outlets in the manifold which could provide for genset cooling and raw-water washdown, which the boat lacks.
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Old 10-08-2012, 05:57 AM   #29
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The Coot has two unused outlets in the manifold which could provide for genset cooling and raw-water washdown, which the boat lacks.

Most folks would use the fire hose system for deck washing.
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Old 11-17-2012, 08:02 AM   #30
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Well during the strip down of my current project I came across this. PMSL at the person who did this LOL... and Yes, that's a head of a bolt

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Old 11-17-2012, 09:16 AM   #31
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My boat has these:


Groco Bronze Perforated Hull Strainer With Access Door++#

The screen came off the one that feeds the engine (the diver left it in the cockpit) and I know why and don't think if can be repaired properly so it will have to be replaced.

I'm trying to decide whether to replace it with the same (screen) type or the one with wider slots.
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Old 11-17-2012, 12:08 PM   #32
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Our intakes are on a seachest. There's a very coarse grate on the outside of the hull which I paid virtually no attention to during our haulout. The inside of the chest is visible from inside the boat and clean. The raw water strainers have never given me a moment of trouble in some 350 hours of use over the last two years. Until I read this thread I had never thought about worrying about them. Now I have something else to add to my worry list.
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Old 11-18-2012, 02:43 AM   #33
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Great discussion here, Thanks
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Old 11-22-2012, 10:59 AM   #34
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I have an idea to add about the comments below. The scoop type strainers with the long slots let the buggers drift in and make a home. This is apparent as it happens routinely on main engine scoops which don't run much at the dock. They are more likely to drift by the perforated type. Forget about the air-conditioner strainers because the constant flow of water sucks the buggers in where they just lay with their jaws agape munching whatever is passing by

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Not sure why, but as the diver of my boat I can say I have never seen any hard growth on the inside of the raw water screen plates mounted on the hull exterior. If there's enough light (sunny day) I can see past the screen bars and see directly in the hole. My theory is that there just isn't enough plankton available inside these crevices (except maybe when then engine is running) to allow the mussels and barnacles to grow. Just a thought.

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Old 11-22-2012, 11:58 PM   #35
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I use these on my main engine and genset intakes. The rest are Groco's round strainers with holes in them, that have hinges and can swing opening for cleaning. The ones below have always worked perfectly with no problems.

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My boat has these:


Groco Bronze Perforated Hull Strainer With Access Door++#

The screen came off the one that feeds the engine (the diver left it in the cockpit) and I know why and don't think if can be repaired properly so it will have to be replaced.

I'm trying to decide whether to replace it with the same (screen) type or the one with wider slots.
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