Moomba Max Wakemakers midship overflow venting tutorial

This mod is pretty well documented by z28ke with his pictures and posts in his Murder Max mod thread (much appreciated). This is a slight variation on his install based off recommendations by folks on the forum and the FB owners group. Figured I'd do an install video of the mod in case it helps others understand. Unfortunately I forgot some tools that I eventually would need so I wasn't able to finish the install entirely but you get the idea of the install in the video. In the part 2 video I will pick up where I left off on the install as well as do a fill and drain water test on the lake.

https://www.youtube.com/watch?v=GD5Hz8Qi3ck

Happy to report the venting works like a champ! Fills great and I did not get a false full ballast sensor trip midway through the filling! The check valve allows the bags to drain SO much better than without a check valve. They were prunes once draining was complete.

Here's a video of them getting full and burping on their own as the water rises in the tubing....

https://www.youtube.com/watch?v=sVRWsUrfyD0

Nice video. I can appreciate it even if the girls in the boat do not. LOL!
I can hear there thoughts now. "OMG! Why does he think anyone will want to see this? I hope he doesn't show me in this and my friends see it. How embarrassing. " LOL!

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Haha yes they are such good sports for putting up with me! My daughter does all the camera work when I’m behind the boat :)

Here is how I tied in my rear bag overflow to the midship overflow, then down to the check valve and finally out the boat. The idea of putting the T like that instead of like T to tie in the rear and midship bags inline was I didn't want a cycle of the midship back-flowing into the rear bag or visa versa. The way I have it is kind of like a waterfall for each overflow bag to dump down into the check valve. Seems to work great and my backs have never drained as tight and empty as they do now.

https://i.imgur.com/76pf4cn.jpg

Here is what I made outside the boat where it's easier to work and then trimmed it to fit once inside the compartment...

https://i.imgur.com/78LfNdP.jpg

Nicely done and great write up!

Quote:

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Originally Posted by z28ke

Nicely done and great write up!

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Can’t say thanks to you enough for your help in your thread for the inspiration and tips. Bags should have come with these overflow setups from WM but it would drive the cost up. Well worth it though!

Here's the final Part 2 video of this install.

https://www.youtube.com/watch?v=qI4cjxHvNPI

Quote:

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Originally Posted by haknslash

Here is how I tied in my rear bag overflow to the midship overflow, then down to the check valve and finally out the boat. The idea of putting the T like that instead of like T to tie in the rear and midship bags inline was I didn't want a cycle of the midship back-flowing into the rear bag or visa versa. The way I have it is kind of like a waterfall for each overflow bag to dump down into the check valve. Seems to work great and my backs have never drained as tight and empty as they do now.

https://i.imgur.com/76pf4cn.jpg

Here is what I made outside the boat where it's easier to work and then trimmed it to fit once inside the compartment...

https://i.imgur.com/78LfNdP.jpg

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What was your reason for putting the check valve in? I am getting ready to buy everything to do the 1345 upgrade in the rear of my Makai and I am wanting to tie the vent on the top of the bags in to the overflow so I don't have to manually vent them each time.

Great vid's and write up Hak! I'm planning to do something similar with mine in the coming week.

Check valves were added to ensure I get a good method for draining the bags since the extra overflow was added. My bags now draw up like vacuum formed prunes and have very, very little residual water left in them when drained. Sorry for the delay in getting back to you TXSurf!

Thanks Hayden! Well worth doing the overflow and I should have done it last year when I added the ballast.

Does anyone have the timer info for the wakemakers rear and mid ship? We do not have the upgraded ballast.

G3 pumps are ~11gpm.

Water is 8.34lb/gallon.

Not sure how much weight the upgrade is but you can take the weight of the bag / water weight to get gallons, then divide the 11gpm to get minutes.

ex.
1100lb bag/8.34/11 - 12 mintues to fill (my rear mojo bag)

Did some research and wanted to help and add to my first response.

The 2 bag to 4 bag upgrade is going to take some serious time to fill if you only have the G3 (3 pump) setup.

1885lb per side = ~20 minutes each - just max out the timer and wait for it to dump out the overflows
Center is 1000lb = ~10.5 minutes

Hope this helps

Perfect thanks, yeah it will take some time but it sure beats manually filling both mid ship bags.. That still takes way longer than 20 min. Thank you for the info

Is there any concern with the overflow from either of the bags flowing down into the other via gravity? I'm adding in a midship piggy backed to my subfloors on my Makai so I'm looking at yours as an amazing example.

Quote:

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Originally Posted by haknslash

Here is how I tied in my rear bag overflow to the midship overflow, then down to the check valve and finally out the boat. The idea of putting the T like that instead of like T to tie in the rear and midship bags inline was I didn't want a cycle of the midship back-flowing into the rear bag or visa versa. The way I have it is kind of like a waterfall for each overflow bag to dump down into the check valve. Seems to work great and my backs have never drained as tight and empty as they do now.

https://i.imgur.com/76pf4cn.jpg

Here is what I made outside the boat where it's easier to work and then trimmed it to fit once inside the compartment...

https://i.imgur.com/78LfNdP.jpg

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Quote:

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Originally Posted by benny32

Is there any concern with the overflow from either of the bags flowing down into the other via gravity? I'm adding in a midship piggy backed to my subfloors on my Makai so I'm looking at yours as an amazing example.

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No issue at all. That’s why I T’d into the rear overflow below where the midship could go back into the rear bag. The midship overflow would go down and not up where the rear overflow is. Alternatively the rear would go down than down + across to go into the midship, hence why I referred to it as a waterfall layout ;). Works great!

Awesome, my new midships and plumbing supplies arrive today from wakemakers so I'm excited to get this setup. My wife isn't as excited about losing the storage but I didn't buy a cargo ship, I bought a wakeboat!

Quote:

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Originally Posted by benny32

Awesome, my new midships and plumbing supplies arrive today from wakemakers so I'm excited to get this setup. My wife isn't as excited about losing the storage but I didn't buy a cargo ship, I bought a wakeboat!

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LOL!! I feel for your future. Let us know how it works out. I can see you sporting a "luggage rack" on your tower when your wife wants to carry some extra items! [emoji6]

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