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  #51  
Old 04-10-2014, 01:16 PM
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FourFourty FourFourty is offline
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Originally Posted by DHPRO View Post
Where do u live...Im bringin my boat to u! This is wayyyy over my head.


Im in Castleton VT. Where are you?
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  #52  
Old 04-10-2014, 03:24 PM
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jdhart73 jdhart73 is offline
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Ah hell I'm just gonna stick with drilling holes. I don't trust that those ports can supply those loads over the long haul. Mastercraft still sends boats out with the pumps motor side down so I can't trust them... Lol.
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  #53  
Old 04-10-2014, 05:26 PM
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lentiman lentiman is offline
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Any idea what year they started using this style of port? '12, '13? I'd love to install two Jabsco's on my stock KGB through hull if it supports the flow. I can look at my boat tomorrow night but it's Thursday and I'm not into delayed gratification today.

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Originally Posted by FourFourty View Post
Should look like this...... Notice how it has the second port added to the top? You can do this to the existing thru hull that only has the lower port on it. (KGB thru hull)

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  #54  
Old 04-10-2014, 05:29 PM
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lentiman lentiman is offline
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Why would long haul matter? Either they support the flow or they don't. Is your main concern burning out the pumps due to insufficient flow? Someone here should be able to figure out if the through hull on these is X diameter how much flow it can support. It's not my specialty though.

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Originally Posted by jdhart73 View Post
Ah hell I'm just gonna stick with drilling holes. I don't trust that those ports can supply those loads over the long haul. Mastercraft still sends boats out with the pumps motor side down so I can't trust them... Lol.
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  #55  
Old 04-10-2014, 05:40 PM
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jdhart73 jdhart73 is offline
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Yes burning out pumps and impellers would be my concern when we are talking about filling 800lb and 400lb bags on top of factory hard tanks. If someone has something to support these thru hulls being able to accommodate multiple pumps then I would be satisfied. Just because Mastercraft does it does not mean that it should be done though so I would like to see some data if available.
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  #56  
Old 04-10-2014, 05:42 PM
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jdhart73 jdhart73 is offline
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They are 1.5" diameter. Have to have someone figure out if the draw of 3 jabsco's or Johnson's fits within those parameter.
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  #57  
Old 04-10-2014, 05:57 PM
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lentiman lentiman is offline
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Maths are hard

<<thanks JD, I corrected my units>>

So the through hull is 1.5"? The tubing for the Jabsco's is 1" diameter and they pull at 540 gph, correct? So the question is can a 1.5" diameter hole pull 1620 gpm.

Did some research, and it's super rough but it looks as though a 1.5" hole should support up to 750-900 gph. So 1620 gph seems like a bad idea. I'm still looking for a better answer though. It does depend on the pressure each pump is providing!

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Originally Posted by jdhart73 View Post
They are 1.5" diameter. Have to have someone figure out if the draw of 3 jabsco's or Johnson's fits within those parameter.

Last edited by lentiman; 04-10-2014 at 06:24 PM. Reason: units!
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  #58  
Old 04-10-2014, 06:08 PM
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jdhart73 jdhart73 is offline
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Each pump pulls 640-720 GPH depending on whether you go with Jabsco or Johnson.
On the rough math that barely covers one pump.
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  #59  
Old 04-10-2014, 07:37 PM
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FourFourty FourFourty is offline
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Well, the inside diameter of the pump ports is only 3/4 so....... Not to mention it necks down even smaller before it hits the vanes.

And I can tell you for sure that a 1 1/2 tube will handle over 4x what a 3/4 tube will.

Anywho, I think either way is going to work fine. I had 3 pumps running off 2 ports on 1 through hull on my Star, and throughput was better than 12gpm on all three pumps, while they were running at the same time.
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  #60  
Old 04-10-2014, 07:50 PM
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jdhart73 jdhart73 is offline
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Pump dimensions don't really matter. The stated capacities are proven at the quoted number.
And I agree, it would likely be just fine but I just don't want to deal with burnt out pumps or impellers so I will play it safe.
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