RiverRat's B-pipe Modification
I am going to test this modification further but the theroy is promising. I like to run a hot exhaust system but am always affraid of melting a hose here or there. Like wise I don't like the number of bends that the exhaust makes between the end of the expansion chamber and the outlet on the waterbox. To many in a short length. In addition to that, I don't care for the 2in od of the expansion chamber opening up into a 2.5in waterbox inlet............increasing pipe diameter should decrese velocity.........then you injetct water into the exhaust, which decreases the exhaust temp, further slowing down the flow. This modification should keep the flow velocity up, decrease the number of bends and allow you to run hotter exhaust temps w/o fear of a meltdown.
I am going to start by using a PJS waterbox (loud) while I am waiting on my X-metal waterbox to get back from the welder. For the x-jet I am not going to have the battery mounted in the OEM location. Instead it will be mounted in the bulkhead. If this proves to be too nose light, I will have enough room to mount the battery in the OEM waterbox location, so I will have room for further balencing the ski. This will also allow for easy battery maintance as the kart gas tank can be removed quickly.
Mandrel Bends
The way current exhausts are set up is they make a 45 degree into the waterbox, then a sharp 90 up, the a anouther sharp 90 to the front and/or back, and then out the rear of the ski. On this exhaust it will have 2 90 degree bends at the front but they will be swept on a 6in radius via a 2in pipe, then into the waterbox where it will exit a 45 degree transition (2.0 to 2.25) and meet anouther 45 degree transition coupler (2.25 to 2.5) where it will attach to the exhaust tube that exits to the rear of the ski. Essentially all I am doing to smoothing out the flow and keeping the velocity up.
