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  1. #31
    Join Date
    Oct 2010
    Location
    Lake Wylie NC Area
    Posts
    828

    Default

    Awesome work, excellent info. If your off-side sac had a check-valve in the vent line, I bet the other side fill pump would not draw air. This would reduce your fill time and improve the flow rate. yes, a larger intake setup would improve the numbers as it would offer more flow capacity. Down side is, there is a pretty good price increase when you step up from 1" to 1.25". But, a single 1.25" will be less expensive then a pair of 1"

  2. #32
    Join Date
    Jun 2012
    Location
    Portland Oregon
    Posts
    825

    Default Thru Hull Fitting Advice

    Thanks Chad. Been following this because I am adding a pump and two bags to my buddy's 100k boat and there's no talking him into another thru hull. He won't mind the 20% loss, he wasn't even planning on being able to run both pumps at the same time.
    -Jake

  3. #33
    Join Date
    Apr 2010
    Location
    saskatchewan, canada
    Posts
    321

    Default

    that is wicked that you set it up just so we all a had info on what is best for everybody's setup. 2.4 min to me is worth a hole in the boat, only bc I have two small kids and that is 2.4 min shorter that they need to wait. But for some people they may feel that it is not worth it but test is awesome and now people have legit info to make a decision on what set up is best!
    Thanks again!
    2005 Mobius LSV

    Gravity IV (750s rear, 400 mid and 650 bow)
    wakeplate, perfect pass,

    Not sure what stereo I have, but I have 3 amps 2 subs 6 x 6.5 mids and tweets and 4 tower speakers ( 2 x 8 inch and 2 x 6.5 and tweets)

    Fuel Injected
    1433 acme prop

  4. #34
    Join Date
    Aug 2011
    Posts
    1,115

    Default

    Quote Originally Posted by saskie99 View Post
    that is wicked that you set it up just so we all a had info on what is best for everybody's setup. 2.4 min to me is worth a hole in the boat, only bc I have two small kids and that is 2.4 min shorter that they need to wait. But for some people they may feel that it is not worth it but test is awesome and now people have legit info to make a decision on what set up is best!
    Thanks again!
    We have a short season, 2.4 minutes difference may not sound like much but over the entire season that's a lot of time wasted..I'd rather spend it surfing...
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV

  5. #35
    Join Date
    Jul 2012
    Location
    Cumming Ga
    Posts
    314

    Default

    The one test that I meant to try out was to run one pump in the forward direction and the other in the reverse direction to see if it forced more water through the filling pump. Maybe that sounds confusing but if you have a T fitting and one pump is emptying and the other is filling then they would both be utilizing the same thru hull fitting. I would think that the pump emptying would increase the line pressure and actually feed the other pump. I am willing to bet that there wouldnt be all that much of a difference because they should be moving the same amount of water.

    I am also a little nervous about the one pump that is emptying injecting air into the system and causing the flow to go to hell. I am thinking that I'm going to go with a thru hull fitting for each pump myself. Its the air issue that I am afraid of all the way around.

  6. #36
    Join Date
    Oct 2010
    Location
    Lake Wylie NC Area
    Posts
    828

    Default

    Quote Originally Posted by chadjitsu1 View Post
    The one test that I meant to try out was to run one pump in the forward direction and the other in the reverse direction to see if it forced more water through the filling pump. Maybe that sounds confusing but if you have a T fitting and one pump is emptying and the other is filling then they would both be utilizing the same thru hull fitting. I would think that the pump emptying would increase the line pressure and actually feed the other pump. I am willing to bet that there wouldnt be all that much of a difference because they should be moving the same amount of water.

    I am also a little nervous about the one pump that is emptying injecting air into the system and causing the flow to go to hell. I am thinking that I'm going to go with a thru hull fitting for each pump myself. Its the air issue that I am afraid of all the way around.
    Where would the air be coming from?

  7. #37
    Join Date
    Aug 2011
    Posts
    1,115

    Default Re: Thru Hull Fitting Advice

    Cavitation from the pump..

    Sent from my Nexus 4 using Tapatalk 2
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV

  8. #38
    Join Date
    Jul 2012
    Location
    Cumming Ga
    Posts
    314

    Default

    Also if there is any air in the bag once it gets empty then the pump would turn into an air pump instead of a water pump and inject air into the line that the other pump is drawing from.

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