how to tell if its a big hub pump 140mm

[glsmohio]

looking for some info for my next build. how do you tell a big hub pump (140mm) form the standard?

 

[ocod]

looking for some info for my next build. how do you tell a big hub pump (140mm) form the standard?

http://www.seadooforum.com/showthread.php?76704-Jet-Pump-Rebuild-99-GTX-RFI

 

[Ankeneyou]

looking for some info for my next build. how do you tell a big hub pump (140mm) form the standard?

The hub is bigger, lol.

 

[Ankeneyou]

Had these sitting on the bench.

 

[glsmohio]

the hub is bigger, lol.

sir thansk for the info. Lol

 

[ocod]

sir thansk for the info. Lol

Did you see post#9 from link above
racerxxx has pictures without the cone and you can see other difference with prop

 

[racerxxx]

Easiest way to tell is the cone. On the small hub you can see the screw heads, on the big hub the screws are counter sunk into the cone.


The other thing to remember is the impeller, you will need a large hub impeller. Problem is you will need to have one re-pitched. They don't make any "performance" impellers for that pump. I talked with Braley about this over the summer. Matt told me to just stick with a brass 140 pump. Good thing for me is I have an extra large hub pump in case I ever trash one on my Speedster.

 

[manolocross]

Is there a performance advantage from big hub to small hub.

 

[Ankeneyou]

It's supposed to give much better bottom end. I'm finally putting mine on this week. Supposed to be like a poor man's skat trak pump.

 

[mikidymac]

Bigger is always better or so I am told. LOL.

 

[1of500]

Easiest way to tell is the cone. On the small hub you can see the screw heads, on the big hub the screws are counter sunk into the cone.


The other thing to remember is the impeller, you will need a large hub impeller. Problem is you will need to have one re-pitched. They don't make any "performance" impellers for that pump. I talked with Braley about this over the summer. Matt told me to just stick with a brass 140 pump. Good thing for me is I have an extra large hub pump in case I ever trash one on my Speedster.

Skat will make you anything but it wont be cheap[emoji6]

 

[Ankeneyou]

I just put a big hub on my spx tonight and am planning on testing out tomorrow after work. It's a mint pump with stock gsx impeller. I'll be sending it off to be reworked over winter but wanted to have a point of reference as to where it was stock.

 

[1of500]

I just put a big hub on my spx tonight and am planning on testing out tomorrow after work. It's a mint pump with stock gsx impeller. I'll be sending it off to be reworked over winter but wanted to have a point of reference as to where it was stock.

Iirc the big hub needs a different nozzel size than the 85 88

 

[Ankeneyou]

I've got the GSX one on there now to try first.

 

[jahman182]

Bigger is always better or so I am told. LOL.

Thats what she told me last night :drool5:

 

[racerxxx]

Iirc the big hub needs a different nozzel size than the 85 88

Yes, I think off a 720 ski????? Like Braley told me..................just run a brass pump.

 

[1of500]

Yes, I think off a 720 ski????? Like Braley told me..................just run a brass pump.

I agree I would pony up for a skat pump if I was going to swap pumps