SoCal Jet Boats
Tech Talk => Jet Pumps => Topic started by: steves86ta on July 04, 2016, 10:11:56 AM
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I had an AT B- impeller in my pump. Spins about 5-5200 rpm on motor at the river.
I picked up a brand new berkeley C impeller off cl for 50 bucks.
My AT has always cavitated hard of I flat foot it from idle.. a lot of you have seen me do it.
I put this Berk in which is a smaller cut expecting some rpm gain and worse hole shot.
I gained about 2-300 rpm. But holy shit the hole shot is better than it has ever been. It'll pull to about 6k for just a second or so then load down.
It's a 200% improvement. And this is a stock non detailed Berk impeller.
My AT is stock s well but B1 cut it to a B- for me. It is set up at about .030 clearance front and back. About .025 radial clearance.
The berkeley was measured to have the same radial, but i didn't measure front to back clearance and you can see it is physically larger clearance. I'll measure after this vacation.
Any ideas why the Berkeley works so much better?