Which laydown waterbox is the best for preventing backflow?

[cpolaris502]

I ran a few searches but didn't come up with a discussion directly on this subject. My number one goal is to keep water out of my motor after bending a rod in my 1105 last year and now I have a freshly built 950 in my new ski. I know switching to a b-pipe would probably solve it, but my XFR currently has an RRP pipe and waterbox and I don't really plan on switching it all out.

I have seen some good things about the Rad Dudes Periscope box... Jet Maniac has their new one but I haven't seen much about it. Limited slip is probably the best if you can actually find one. This is freeride ski so I'm sure I'll be bailing occasionally, taking breaks out in the lake, etc.

 

[zyxwvu44]

Don't forget to angle you pipe up from the hull then down to the water box. I don't seem to have issues with the standard PFP box

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[800750]

I had really good luck all summer with my jm water box in my xfs. Id recommend it. Plus it seems pretty quiet compared to others

 

[Rickjs4l]

Following

 

[krash45p]

I have the jet maniac box and it works great for flow and keeps the water from backing up into engine the rrp box is more for just freestyle racer who goes out for few tricks and heads back in and than put on the stand out of water I had bad poop happen with rrp box but since switching no issues to date

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[iQRTurbo]

It’s not so much about the waterbox keeping water out of your engine as it is about what you do piping after the waterbox. It’s about the interface of the static water level outside the hull and how it compares with the highest point in the tubing inside. Actually it’s about the lowest point in the highest point if that makes any sense because you have to compare with the point where the water will trickle over the lowest point of the highest bend. If that point is lower than the lake level any waterbox is going to fill from the rear and dump into the pipe. Getting water into the belly of the pipe and throwing a knee in the tray sinks the back will make half the water run out the pipe and the other half dump into your open exhaust port(s). We use a 2.5” aluminum 135 degree U bend and the appropriate degree silicone tube joiners from Silicone Intakes to create a high flowing but tall hump after the waterboxes to keep water out. Nothing else works nearly as well and as a bonus it nearly eliminates bogging when you stuff the back in hard on a 540.

 

[tipafew]

It’s not so much about the waterbox keeping water out of your engine as it is about what you do piping after the waterbox. It’s about the interface of the static water level outside the hull and how it compares with the highest point in the tubing inside. Actually it’s about the lowest point in the highest point if that makes any sense because you have to compare with the point where the water will trickle over the lowest point of the highest bend. If that point is lower than the lake level any waterbox is going to fill from the rear and dump into the pipe. Getting water into the belly of the pipe and throwing a knee in the tray sinks the back will make half the water run out the pipe and the other half dump into your open exhaust port(s). We use a 2.5” aluminum 135 degree U bend and the appropriate degree silicone tube joiners from Silicone Intakes to create a high flowing but tall hump after the waterboxes to keep water out. Nothing else works nearly as well and as a bonus it nearly eliminates bogging when you stuff the back in hard on a 540.

Just so I understand this correctly......You want the high point of the lowest point to be higher than the highest low point but just below the high point that's below the higher point immediately followed by the low point?

 

[Quinc]

If you can find one or convice @LimitedSlip7 to make them again they are the best for backflow. Next is probably pfp and/or JM.

Other - The ScupperBox

Having problems with water filling up your lay-down style pipe and getting into your expensive motor? Can't fit a tall waterbox into your hull but still want protection against water intrusion? Don't want to worry about rubber flaps degrading and tearing off? This might be the waterbox for you...

www.x-h2o.com

Running a RRP pipe with PF water box

Has anyone run a RRP pipe with a Power Factor water box? How are the results? I have access to them both for almost free.

www.x-h2o.com

 

[Freakrider]

It's also a good practice to pull the ski up on beach stand backwards, especially on high incline shorelines, so the manifold is the highest point.

 

[MarkWalker]

I have been using an RRP pipe with a JetManiac laydown water box combo on my Rickter FR2 Evo last year and on my TigerCraft SV1 this year with no problems at all. Chris mentioned they designed that box and baffles set-up because of a friend had all kinds of problems with water intrusion in his ski.

 

[Baja 252]

We have a RRP pipe and water box. With a couple elbows in the pipe you can get it high enough in the hull that water would have a hard time back-flowing into the engine. Several seasons on this setup and never had an issue.
This is the best pic I could find.