Freestyle superjet pump inlet modification

[Spooky]

I'm in the process of modifying my RN hull. Shortening it, defoaming, wider tray, etc. I'm looking at doing all the glass/carbon work first, then begin the awesome process of giving all my money ro an engine builder in exchange for horsepower and a girlfriend who hates me and wonders why i spend all my time in the shop working on my ski instead of with her and spending all my money on the ski instead of her. I digress. Im looking at xscreams 865 or a motor of similar power.ill be getting a 144mm magnum setup. I have seen threads where guys need to shave the sides of the inlet to allow a larger pump to fit but i was thinking of sectioning the forward part of the inlet and moving it forward a little (1 inch give or take) to allow a larger volume of water to be sucked into the pump. I have seen this happen on hybrid 300sx hulls where the impeller will just cavitate due to a restricted waterflow to the pump. Has this been done on a superjet? Is it necessary? Will it be worth my time/effort? How do I get my girlfriend to shut up and accept my jetski addiction? Answers to these questions will be appreciated.

 

[chad]

How do I get my girlfriend to shut up and accept my jetski addiction? Answers to these questions will be appreciated.

good luck with that

 

[snowxr]

First part: I'd widen the inlet. Making it longer will allow water in the pump (cavitation) earlier taking off from jumps.

Part 2: Hypnotism. It's the only way.

 

[Joker]

Get her hooked on the sport? Compare it to her hobbies?


Ice and aspirin heals any wound 

 

[Penken]

First part: I'd widen the inlet. Making it longer will allow water in the pump (cavitation) earlier taking off from jumps.

Part 2: Hypnotism. It's the only way.

guess you mean air in to the pump. if water in the pump would cause caviation the ski would have trouble moving at all

 

[Mark44]

Have her get a SJ.

Mark44

 

[Marcgraham27]

get a new girlfriend

 

[Idok]

I'm in the process of modifying my RN hull. Shortening it, defoaming, wider tray, etc. I'm looking at doing all the glass/carbon work first, then begin the awesome process of giving all my money ro an engine builder in exchange for horsepower and a girlfriend who hates me and wonders why i spend all my time in the shop working on my ski instead of with her and spending all my money on the ski instead of her. I digress. Im looking at xscreams 865 or a motor of similar power.ill be getting a 144mm magnum setup. I have seen threads where guys need to shave the sides of the inlet to allow a larger pump to fit but i was thinking of sectioning the forward part of the inlet and moving it forward a little (1 inch give or take) to allow a larger volume of water to be sucked into the pump. I have seen this happen on hybrid 300sx hulls where the impeller will just cavitate due to a restricted waterflow to the pump. Has this been done on a superjet? Is it necessary? Will it be worth my time/effort? How do I get my girlfriend to shut up and accept my jetski addiction? Answers to these questions will be appreciated.

keep pushing the limit....she'll either accept it, or bail

you win, either way



instead of modifying the inlet, use a mag pump with a setback impeller..that will get you the intake volume you are after....however.with that size engine and pump you'll never run out of water

 

[D-Roc]

I am going to be hacking up my pump inlet soon. I would agree that it is not necessary but would be a benefit with the 144 pump. I am going with a bigger pump so i want to make sure the inlet is as big as the pump is. I am not sure of how I am going to do it all but part of it will be making it wider, not longer.