Cavitation Problems

[fischer550]

I have a WDK RIP hull

No intake grate (comes like this)

850 big bore non PV motor

B pipe limited chamber

ATP Flame TL

190 compression

144 skat set back magnum pump

reduction nozzle bored out to 85mm

I have tried a hooker 9/15 and 12/17. 9/15 seems like it hits a bit harder down low, but both props seem to cavitate right when I punch the throttle to go for a flip.

Is it worth going to a 155 for this setup?

 

[zzylstra]

Pump shoe sealed up?


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[fischer550]

Pump shoe sealed up?


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Yes

 

[zzylstra]

Yes

Pump seal is in good shape, makes contact on entire pump shoe surface, and squished a good amount?


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[jonolove]

Does the prop spin? Describe the cavitation feeling

 

[fischer550]

Pump seal is in good shape, makes contact on entire pump shoe surface, and squished a good amount?


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I will double check when I get home

 

[fischer550]

Does the prop spin? Describe the cavitation feeling

It feels like prop is spinning, yes

 

[js/sj]

Do you have the intake grate stuffer that bolts to the pump shoe where the intake grate bolts up? If you dont it'll suck air from pump area to the pump tunnel.

 

[jonolove]

Change your nozzle to a unbored one see if that helps it not spin it should

 

[fischer550]

Do you have the intake grate stuffer that bolts to the pump shoe where the intake grate bolts up? If you dont it'll suck air from pump area to the pump tunnel.

Not sure what you mean. Are you talking about screwing in a bolt into the pump shoe?

 

[js/sj]

If you dont run a intake grate u need the piece that bolts to your pump shoe to fill the void where the intake grate goes. If you dont it sucks air into your pump tunnel.

 

[fischer550]

If you dont run a intake grate u need the piece that bolts to your pump shoe to fill the void where the intake grate goes. If you dont it sucks air into your pump tunnel.

Just checked, there are 2 bolts already in there where the grate bolts usually go.

 

[js/sj]

okay so you got bolts in there..... Come on bro, not what i was saying, u need the piece that bolts in there, not just bolts.

 

[fischer550]

okay so you got bolts in there..... Come on bro, not what i was saying, u need the piece that bolts in there, not just bolts.

I am not sure what piece you are talking about?

 

[jonolove]

I am not sure what piece you are talking about?

He is saying to make something to bolt on to the shoe to keep pressure on the pump seal just make one out of trex or something like that

 

[js/sj]

You need the piece that bolts to what is circled in Picture 1. Picture 2 shows the way air is pulled through that section to the pump tunnel if there isn't the piece bolted in. Cant get more straight forward than this...........................................................................................................................................................................................................................................




















WDK SELLS THESE FOR THERE HULLS FOR THIS REASON> HAVE YOU CONTACTED JEFF???? THE GUY YOU BOUGHT THE HULL FROM...............

 

[js/sj]

He is saying to make something to bolt on to the shoe to keep pressure View attachment 324616 on the pump seal just make one out of trex or something like that

THANK YOU!!!!!

 

[fischer550]

Ya I have a piece like that in there.

It is not a huge cavitation, but it is enough to notice.

 

[js/sj]

Then how are we supposed to tune your pump without riding it?

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[fischer550]

Then how are we supposed to tune your pump without riding it?

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Just looking for advice...