PP Jet impeller sizes/grades

[DavidTombs]

I've recently purchased a speedboat with supercharged 3.5 Rover V8 driving a PP Jet drive (don't know which PP Jet model it is - how can I tell ?). The supercharger is currently missing it's drive belt, but appears functional. Having spent a few days tinkering/tuning the engine and adjusting/improving the tilt/trim on the jet drive the boat will now rev to around 5000rpm (engine speed) easily which is giving over 40mph (GPS). This is without the supercharger running. Once the supercharger is running (end of this week hopefully) the engine should be producing more power/torque but I'm assuming that to get more speed I need to change the impeller as its the engines RPM that effects the jet drive's thrust, not it's power. My current impeller is a 4-bladed one with the number 2034 one it - does this mean anything to anyone and if it does can you tell me what my options are for a 'faster' impeller.

[USCGRET/E8]

From a thread back in 04...

PP jet drives have been taken over by Vosper Thorneycroft in Portsmouth, but are really expensive for spares (£500 for an impeller) But i have found a guy up in the Midlands who is cheap,,,,
I have a pp on my Fonda 166 GTO (v8 rover engine)

[bullet]

You mentioned a bloke in the midlands who can get cheap spares for PP jet drive, I have a dateline bikini and need to replace or repair my impeller. Can you help? Thanks Will.