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#1
05-30-2006, 10:09 AM
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washdown
Where is the best place to put a thru hull on a 20'?
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#2
05-30-2006, 06:28 PM
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Re: washdown
Not a pro here, like many others, but away from the center of the boat ( as in not near the drive ). That could cause cavitation and screw up the props ability to bite into 'solid water'. Also, I drilled a few extra holes in the aft side of the water pickup ( it was a recommendation from someone here, awhile ago, to help reduce the water jamming into the intake w/ such force that it would cause blow-by, past my pump - making water spray out the through the pump hose even when it was off. It reduced that blow by by 75%.
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#3
05-30-2006, 07:03 PM
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Re: washdown
I also remember reading about the holes drilled in the back of the pickup. I have looked back and could not find the post. How many and what size holes did you drill?
__________________
"Anything you let a dog do, you're training it to do." - 1977 23' Superfish ST250x Yam
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#4
05-30-2006, 11:53 PM
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Re: washdown
It really wasn't a science - I just drilled with 1/4" bit ( or so... ) a few holes, maybe (5-6) holes. I don't think there is any detriment w/ a few more or less. But, it did work. I bet if I drilled a few more holes it would reduce the pressure even more. I just keep a hose attached all the time and I have a plastic, garden variety on/off valve that has been on for several seasons without a leak. I initially bought a bronze one, thinking it was TOUGH! it leaked terribly, the plastic valve works like a champ ! FYI: I am also really happy with the ITT/Jabsco PAR 4 washdown. It is built tough and gives plenty of pressure. I use it for my live well too. Screw the fancy/shmancy spray nozzles - I bought a yellow plastic one for a $1 at my local hardware store - works better than anything else.
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#5
05-31-2006, 10:19 AM
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Re: washdown
Where on the hull did you place the thru hull? Where is your access to the valve and pump?
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#6
05-31-2006, 06:01 PM
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Re: washdown
I have a 23' Tsunami w/ an i/o so I'm sure it's different. It's in toward the outside of the middle 'rise' from the center line. I access it from inside my engine compartment. See picture:  This had (2) i/o's and I converted it to one i/o, so it might look different from most other stock, single i/o's.
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Linear Mode
