Clearance between impeller & pump stator

[loictahiti]

Hi guys

I starting to build an 148 SS Solas pump, with skat 9/14 , so I think I have to much space between impeller and pump stator, what the best space, For cut the impeller bottom ?
thanks
Have great WE

 

[Freakie]

with my cut back big hub impellers the gap is hardly a millimetre...yours looks much bigger, but from my understanding that softens the hook-up a bit

 

[kevbo]

I would rate that as nothing to worry about. There is a LOT more gains in a larger than stock nozzle.

 

[JetManiac]

I would cutback the inner hub and bring it down tighter to vanes.

 

[loictahiti]

I would rate that as nothing to worry about. There is a LOT more gains in a larger than stock nozzle.

Thanks
I plan to bore at 85 mm , is it good

I would cutback the inner hub and bring it down tighter to vanes.

yes I'll do that , impeller already at the machinery shop

 

[JetManiac]

yes I'll do that , impeller already at the machinery shop

We like impellers close to vanes if possible. You can use impeller spacer stainless washers/shims to space forward to adjust distance to stator hub/vanes if needed. Then if needed for pump tuning, you can also space forward, like slipping a little especially off the bottom. It is more of a fine tuning thing if the pitch, nozzle size, and engine are close match already.