Boring nozzle with stock WB1 impeller

[CARBONX2]

I have a customer with almost a completely stock WB1. How big can the nozzle be bored without suffering cavitation?
I used to doing this with am props and modded engines, a bit wary with the lower hp and poor impeller design.

 

[blaster800]

thats one of the last mods to be messing with ..imo, untill other mods are in place ....

 

[kevbo]

I have a customer with almost a completely stock WB1. How big can the nozzle be bored without suffering cavitation?
I used to doing this with am props and modded engines, a bit wary with the lower hp and poor impeller design.

The stock nozzle is too thin to bore enough to make much difference.

 

[#ZERO]

The stock 61X reduction nozzle is tapered at 2.2-degrees with an 82.3mm exit diameter and has an 89.2mm outside diameter so it can be safely bore too around 85.5mm depending on the angle used. I wouldn't go any larger than 84.5mm with a blaster-I if you want to keep the top speed and would recommend installing an A/M stainless impeller before doing the nozzle modification.

 

[CARBONX2]

Thanks, pretty much what I thought.