Other Stupid question of the day award goes to ::::::: Me !!!!!!

[mxzxrs]

What function does a pump and pump cone serve??????

 

[Matt_E]

The pump transfers motor power to the water. It makes the jet.
The pump come provides a smooth transition from pump hub to exit nozzle and somewhat regulates pump pressure.

 

[mxzxrs]

i thought that it was the job of the impeller matt?? im still confused

 

[Cannibal]

The pump is the housing the impeller sits in. The vanes in the pumps help straighten out the flow coming off the spinning impeller.

 

[mxzxrs]

Makes more sense ,thanks Cannibal,, also theres a fitting im assuming water on the pump thats water flowing through the pum to help straiten the water from the impeller???

 

[mxzxrs]

So even stupid questions can pay off LOL

 

[Cannibal]

Your pump is creating pressure because your impeller is forcing the water through the pump. The water is spinning, so the pump vanes (fins) help straighten it out some. That fitting with the hose hooked to it takes some of that pressurized water and runs it through the engine for cooling, then that goes to the little "pisser" fitting on the side of the hull.

There is another hose hooked to the reduction nozzle. That is the part that goes from large to small to create even more pressure. That tube is the siphon bilge. The rushing water past that fitting creates a venturi (like a carburator sucks fuel down it) to remove the water from inside your engine compartment.

There are no dumb questions, everyone needs to learn somehow.

 

[mxzxrs]

Thanks again,, By the way I been checkin out your snoball build,,Awesome stuff,, I know now what these guyss say about this sport being an addictiion, im loving all aspects of it and am like a sponge!!!!

 

[mxzxrs]

Will my stock SJ have a bilge from factory??

 

[Cannibal]

Thanks. I'm heading out to do more here in a few. Need to get this thing on the water.

Yep, if your ski is un-altered, it will have a siphon bilge.

 

[D-Roc]

Having different pump cone sizes will change the volume inside of the pump. The bigger the cone, the less volume, the quicker the pump hooks up and primes. The reduction nozzle size determines the pump pressure in relation to the prop pitch. The bigger the diameter of the reduction nozzle the less pressure the pump creates reducing the load on the motor.

 

[aramis]

without a pump, an impeller is just a propeller.

the pump cone allows you to tune the flow through the pump and the corresponding pressure in the pump. Short cone = High flow, low pressure = quick acceleration. Longer cone = Less flow but at higher pressure = top end speed.

Your ski should have a vacuum-driven siphon bilge from the factory. Look at the back of your ski and find the steering nozzle. Hint: it turns when you turn the bars. That steering nozzle has two bolts (one top, one bottom) holding it to the reduction nozzle. The single hose mounted on the reduction nozzle sucks water from the engine bay since a vacuum is created as high speed water is shooting through your reduction nozzle. If that is there and connected, chances are you have the little white plastic box in the engine bay that sucks up the water too...and that is the complete siphon bilge system. White plastic box is clipped down to the engine bay floor under the intermediate shaft housing (which is mounted to the bulkhead behind the motor).

If you look at the next piece of the pump toward the front of the ski, that is the stator section. (Not to be confused with the electrical stator). You will also find a hose connected to the side of the stator. Since this is in the stator section, and due to the location / geometry of that hose connection, water is forced through that hose and up through your engine / exhaust for cooling. Opposite action of the siphon bilge, basically.

 

[Brabender]

without a pump, an impeller is just a propeller.

the pump cone allows you to tune the flow through the pump and the corresponding pressure in the pump. Short cone = High flow, low pressure = quick acceleration. Longer cone = Less flow but at higher pressure = top end speed.

Your ski should have a vacuum-driven siphon bilge from the factory. Look at the back of your ski and find the steering nozzle. Hint: it turns when you turn the bars. That steering nozzle has two bolts (one top, one bottom) holding it to the reduction nozzle. The single hose mounted on the reduction nozzle sucks water from the engine bay since a vacuum is created as high speed water is shooting through your reduction nozzle. If that is there and connected, chances are you have the little white plastic box in the engine bay that sucks up the water too...and that is the complete siphon bilge system. White plastic box is clipped down to the engine bay floor under the intermediate shaft housing (which is mounted to the bulkhead behind the motor).

If you look at the next piece of the pump toward the front of the ski, that is the stator section. (Not to be confused with the electrical stator). You will also find a hose connected to the side of the stator. Since this is in the stator section, and due to the location / geometry of that hose connection, water is forced through that hose and up through your engine / exhaust for cooling. Opposite action of the siphon bilge, basically.

great answer. Aha now i Understand
thank you

 

[swapmeet]

Ok, since this seems to be the place to ask. From my reading a Mag pump has more vanes (fins), but what makes it hook up and perform better? I'd it the larger hub? I've read that people swear by them etc, but never could wrap my head around why.

 

[D-Roc]

The bigger hub, again like the pump cone size, has lowered the volume inside the pump. So the prop fills and pressurizes the reduction nozzle quicker. The extra vanes split the work in half making it much more efficient.