Which way to face an engine strainer? - SailNet Community

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  #1  
Old 07-19-2007
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Which way to face an engine strainer?

I am re-thru-hulling the boat, got the old engine intake strainer thru hull off. That was installed with opening "grate" forward. I've seen them go on both ways, though. What is the "right" thing to do? There are only two answers, so I figure we'll make it a vote
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Old 07-19-2007
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Do you have a photo of the particular strainer in question...
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Old 07-19-2007
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I do not. Why, does it matter? Looks like this one:


Aren't they all more or less the same?
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Old 07-19-2007
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I am not sure it matters but probably less drag facing aft. The venturi effect draws water in that way.
pigslo
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I have been told by the mechanics at Toledo Beach Marina the openings should face aft, but have had a problem when moving foreward at speed with a small flow. I turned mine around with the slots facing the bow and have a very good flow through the raw water system when moving. So I would vote for having the slots face the bow of the boat. Wes Carroll
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Old 07-19-2007
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I vote forward
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Old 07-19-2007
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I thought forward should be correct. It help scoup water into whatever system you connects it to. If face aft, water may not flow in well enough due to venturi effect.
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Old 07-19-2007
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I think you will see a dramatic increase in boat speed by facing it aft because of the lift created by the airfoil design (G). Seriously now, ours faces aft, no problems with water flow. I vote aft.
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Old 07-19-2007
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I just have a ******* hole in the boat there with a welded standpipe above it, so maybe I'm not the best guy to ask, but it occurs to me that with the slots facing forward, you run the risk of having small debris like plastic bags get stuck there as the boat moves forward. You might also increase the head pressure to the pump (if you lack a sufficiently high intake loop) that could cause leaking. Aft-facing scoop slots should shed plastic crap and would not funnel water up the hose/pipe when sailing fast.

Feel free to question my logic here. I am going to 4200 a plastic strainer on this fall because it's possible to get a bloody fish stuck up my standpipe, which is even more unpleasant than it sounds!
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Old 07-19-2007
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Quote:
Originally Posted by Valiente View Post
I just have a ******* hole in the boat there .... it's possible to get a bloody fish stuck up my standpipe, which is even more unpleasant than it sounds!
Same thing happened to us on our last boat (straight thru-hull without an external strainer) - a small fish got sucked up into the inlet, blocking the raw water in a way that was very difficult to discover, and to clear. We ended up swimming to rod out the line - it was then that what was left of the unhappy fish popped into the strainer bowl!

btw re strainer orientation, have seen both... be bold - install it sideways!(kidding)
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