Super Jet B Pipe Cooling

[MX952]

I know there are 1000 posts on this but I can’t seem to find this specific one.

On a B Pipe Is it recommended to run a line direct to the stinger with an FCV or does one want a T so it has a bypass? This setup also is dual cooled and has a bypass outlet from the head to a pisser so it seems one could eliminate the stinger bypass.

If it needs a bypass why? It seems it would be better to control the exhaust water with only the FCV.

Any information is appreciated.


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[kevbo]

Flow control valves became a thing long after skis became fast. Everyone, overnight, decided they had to have one. Shutting off the water always makes the exhaust louder, which riders always perceive as faster. I recommend placing a .100” orifice in the stinger, or whatever size it takes to keep water box temps bearable.

 

[MX952]

Flow control valves became a thing long after skis became fast. Everyone, overnight, decided they had to have one. Shutting off the water always makes the exhaust louder, which riders always perceive as faster. I recommend placing a .100” orifice in the stinger, or whatever size it takes to keep water box temps bearable.

I understand all of this, the main question is a bypass needed and if so why when one has a water exit on the head to relieve any excess pressure?


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[kevbo]

The actual pipe needs to get hot in order to make power. The rest of the exhaust needs to be cooler so it doesn’t heat up the engine bay too much. You want more pressure in the head pipe than downstream. I like to T a pisser in the stinger line and install a restriction at the stinger. This way I can adjust the total pressure by watching how far water sprays out. Flow control valves are just pop offs that shut off everything until a certain pressure is reached. They tend to make the exhaust ear splitting loud.

 

[kevbo]

I understand all of this, the main question is a bypass needed and if so why when one has a water exit on the head to relieve any excess pressure?


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To answer your question, as long as the stinger was restricted, a bypass is not necessarily needed in that line. It could be at the head and work just as well.

 

[MX952]

To answer your question, as long as the stinger was restricted, a bypass is not necessarily needed in that line. It could be at the head and work just as well.

Perfect. Thank you.


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[fastgtfairlane]

I like to run a separate dedicated line to my head pipe with a line directly overboard on the outlet. I use a piece of 1/4 fuel hose as a restrictor at the pisser fitting. This keeps constant pressure on the headpipe which helps with tuning the screws on the headpipe. I also run freshwater that is not preheated through the engine first which allows less water in thr exhaust to keep it cooler. Tee your stinger off of the front bypass on the head.. also make sure to take a little time to tune the flow control so it actually opens. Depending on your setup, you might need a restrictor on the bypass off the stinger with the flow control so there's enough pressure to make it function properly. My ski has 2 -1/2inch lines from the pump so i ran a manifold with 2 inlets, 4 3/8 outlets. 2 to the engine, one to the headpipe going to pissers and the 4th outlet to the stinger with the flow control. It opens at around 1/4 throttle.

 

[MX952]

I like to run a separate dedicated line to my head pipe with a line directly overboard on the outlet. I use a piece of 1/4 fuel hose as a restrictor at the pisser fitting. This keeps constant pressure on the headpipe which helps with tuning the screws on the headpipe. I also run freshwater that is not preheated through the engine first which allows less water in thr exhaust to keep it cooler. Tee your stinger off of the front bypass on the head.. also make sure to take a little time to tune the flow control so it actually opens. Depending on your setup, you might need a restrictor on the bypass off the stinger with the flow control so there's enough pressure to make it function properly. My ski has 2 -1/2inch lines from the pump so i ran a manifold with 2 inlets, 4 3/8 outlets. 2 to the engine, one to the headpipe going to pissers and the 4th outlet to the stinger with the flow control. It opens at around 1/4 throttle.

Great information. Thanks for the response.


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[subnsxr]

Just do the Wammer Mod, Wamliton's spent tons of research time on this subject.

 

[Storbeck]

Seems like this would all depend on your water routing. If the line going to the stinger is the only line coming out of the header then I would want a bypass so that not all of the water that flows through the header cooling jacket goes into the stinger.

If your water routing is different than that, then it's a different question with a different answer.