Carbon seal and spring would've been bouncing around on the mainshaft in front of the impeller. This could have created a 'rumbling' sound as the...
The jets are un-complicated and have few moving parts. You are unlikely to need to replace the impeller as was implied a few posts ago as the...
Yes the bottle is a sealed vessel. The same too could be said if the intake and nozzle freeze first, then what is left inside the pump is...
Ah yes, I do recall seeing a few now. They were about the same time as the Merc Sportjet came out. Nowhere near as successful, athough Merc did...
That looks to be a derivitave / in the same class as the HJ212. The HJ212 has a 210mm diameter impeller and Inlet hole of 525mm x 260mm. I would...
Did OMC make a jet? Or was it one of those abortive and problematic (in my opinion) outboard versions? (simply bolt a jet onto an outboard leg and...
With the hp you have available and size / weight of the vessel you may wish to consider the Scottjet, possibly the Flo-pro as well, but at 2.5...
I would fear that as the water inside the tunnel and body freezes that it would expand and crack or break the pump, much like when you put a...
Clearly mis-informed with limited jet experience, probably with jets in the '70's
Mercury didn't make a 220, they had a 200 (Optimax), 210 (Dual carb, obsolete), 240 (EFI, obsolete), and 250 (Optimax). Interesting that...
That is unfortunate, the Sportjet (which I am assuming you used as it is drawn in your previous drawing) would have struggled with performance due...
Had you considered the merits of running the flat area (which we refer to as the 'delta', not sure of the origins but it could be due to the...
They return water back to the pump rather than to waste through the exhaust? You could always add a venturi into the tail housing for your purpose
Rupert, how it the build coming along?
Sorry, I don't generally watch ball sports. Though I did notice we have the Webb Ellis cup at the moment! Yeah, a chainsaw and winch can be...
The Mercury Sportjet has a Venturi bilge pump in the tail pipe in the pressure zone. Works reasonably well. No reason it wouldn't work for this...
Planning on using one in a boat? Some of the guys are getting their alloy boat, motor, pump to weigh in at about 500#'s all up. Light enough so...
Tom, I've read a number of your posts, most seem sound, but this one baffles me. One of the beauties or waterjets is their simplicity, lack of...
Or a trim / ride plate that moves forrard over the intake hole when 'sealed' then back under the pump when open, if you were clever you could make...
Top wall of the tunnel have a second skin with a seal around it, actuated by a ram so it closes inside the tunnel close to the bottom of the hull....
