Building 3" and 2.5" dredge nozzel
Whats size venturi 25mm socket for 3" 20mm 2.5"
Whats everyone’s thoughts
will really depend on size of pump driving
If your using a 6.5hp with a trash type pump go for 12mm you need pressure , iv not made a suction nozzle but that size works on a power jet .
Gx200 hp300 proline for 3"
2.5" 2stroke tanaka 381 300l min 40m head
I had a Hp300 on a 4” a few years ago it worked ok from memory the Hp300 was designed for a high banker type setup but I’m sure on a 3” it should be well suited on a 4” the P180 worked better , I can’t remember what size the jet orifice was I’m taking a punt but I’m thinking 15mm …20mm I suspect will be too big pretty sure the Keene power jet with theP180 is 20mm so youl likely need to be smaller than that .
Biggest thing is match your jet to your pump. With your proline hp300 which are good pumps typically you should be aiming for around the 20-22mm jet size it should have no problems running that 3 inch. Just make sure you dont use a washer to create your jet as you will loose a ton of power from the pump. .Instead use a conical reducer for your jet which converts the energy of the water from the pump into velocity which is what is required to run a suction nozzle.
Also try and keep your hose from the pump to the suction nozzle as short as possible to reduce fluid friction.
Cheers
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