FlightPlanDan
Don'tTrustAfartAfter50
- Location
- Crescent Beach, FL
I realize this is tech stuff or experience stuff....Assume I have neither
A "very" reputable builder told me that a bored nozzle would really "wake-up" my 12/17 skat swirl.
Bored nozzels that are still set up for the stock bilge are a bit harder to come by than for dual cooling boats.
When one came available, I grabbed it. It was bored a bit larger than the builder suggested, but I grabbed it. 85.5mm.
Well, being the non listening guy that I am, I installed the nozzle and a different impeller at the same time. (a 9/15 hooker)
This didn't work well. I felt a good hit, but it immediately decayed into what seemed like a loss of power.
The hooker was small on the O.D. by (eyeball 1mm per side..total 2mm) which would cavitate anyway.
I put the skat back in.
It's not perfect and neither is my wear ring. But I borrowed a bud's wear ring section of a 144 pump to verify.
Question: with a nozzle bored this big, would a higher pitch impeller do a better job even at low end?
In my mind it will work, but, as you know, my mind is warped. The higher pitch prop moves more water if it has somewhere to go. Stock nozzle - nowhere to go=loss of low end. Am I wrong?
I'm about to try a 14/22 skat.
your thoughts please. Through experience or science!
Dan
Standard bolt-ons, b-pipe, enhancer etc...not ported/polished, 190 compression ADA head. 701.
I can always go back to the stock nozzle. But I really want to know what will work with the 85.5 nozzle.
And I'm willing to experiment to find out. Thought somebody might know.
A "very" reputable builder told me that a bored nozzle would really "wake-up" my 12/17 skat swirl.
Bored nozzels that are still set up for the stock bilge are a bit harder to come by than for dual cooling boats.
When one came available, I grabbed it. It was bored a bit larger than the builder suggested, but I grabbed it. 85.5mm.
Well, being the non listening guy that I am, I installed the nozzle and a different impeller at the same time. (a 9/15 hooker)
This didn't work well. I felt a good hit, but it immediately decayed into what seemed like a loss of power.
The hooker was small on the O.D. by (eyeball 1mm per side..total 2mm) which would cavitate anyway.
I put the skat back in.
It's not perfect and neither is my wear ring. But I borrowed a bud's wear ring section of a 144 pump to verify.
Question: with a nozzle bored this big, would a higher pitch impeller do a better job even at low end?
In my mind it will work, but, as you know, my mind is warped. The higher pitch prop moves more water if it has somewhere to go. Stock nozzle - nowhere to go=loss of low end. Am I wrong?
I'm about to try a 14/22 skat.
your thoughts please. Through experience or science!
Dan
Standard bolt-ons, b-pipe, enhancer etc...not ported/polished, 190 compression ADA head. 701.
I can always go back to the stock nozzle. But I really want to know what will work with the 85.5 nozzle.
And I'm willing to experiment to find out. Thought somebody might know.
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