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I have a one piece skat setback pump with what is most likely an impeller galled to drive shaft. The skat impeller finally broke free, but still extremely tight and notchy when it does move. I also destroyed the skat hex impeller tool in the process. I am currently waiting on getting two...

Like smoofers said, cavitation occurs when you do not have enough inlet pressure to fill the void left by the spinning pump element as it goes by. The pressure required on the inlet is sometimes referred to Gear Tip Velocity Head (GTVH). It is essentially dependent on the pump diameter and...

I received the answer I was after, it was 1/4-28. Thanks.

Does anyone know what thread size and pitch the oversized factory pipe headpipe water screws are? Perhaps different venders have different setups. Let me know what you have. The originals are 10-32, but I need to close one off quickly while I get an oversized set. So I thought I would block it...

I wanted to post my experience with Sekssuperjet, so at least others can interpret it for themselves. Some may view this differently or not a big deal. I would have appreciated knowing this info. Summary – From my point of view the seller sold the ski out from under me after I was pretty darn...

In my opinion the threebond would do a good job in sealing the threads, however would provide minimal retaining torque. 1211 is also an aerobic sealant. Threadlocker is usually anaerobic. You want anaerobic in a thread application for torque hold. I have had my headpipe screws back out...

That is what I was asking. Infused hulls right out of the mold have an awesome finish, if done right. It may be tempting to not put clear on. However unless they use a UV stable resin, or good UV protection clear on the exterior this can happen. I would assume it would be standard to clear...

With more and more aftermarket hull manufacturers offering visual carbon fiber hull options, has anyone seen seen signs of degradation in appearance after prolonged exposure to sunlight? Usually the epoxy resin is the weak point in not being very UV stable. Some resins might purely turn...

What powered cutting tool did you use? I used an oscillating multifunction tool. It cut really fast through it with the right toothed blade. You just need to watch out that you are not cutting the hull. You end up cutting off strips of the glue instead of grinding it all away. Still made...

Vanes in the turn/steering nozzle should improve steering depending on how much the water is spinning leaving the reduction nozzle. The vanes will help straighten the water (like the stator vanes do), but in this case it is helping to increase the velocity of the water going in line with the...

I am using AMESim

Most likely you will have a case of diminishing returns to get you to the peak efficiency point. Then the efficiency would drop if you keep on going. You have to balance pressure (and resultant pump power) from the vanes with the added benefit you get from a greater portion of the pump water...

The simulation was put together to mainly focus on the reduction nozzle investigation. It mainly looks at the impeller, pump, and engine torque curve being constant and looking at what the expected changes happen due to the nozzle. I can use this to help understand where I should go with the...

I posted this over on PWC today in the Kawi section, but I thought I would post it here too. Just thought I would share this information. Take it for what it is worth. The age question of whether one should taper bore or straight bore the exit of the reduction nozzle has been around for...