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Thanks! That covers it nicely. Your info is pure gold! (y)

When I go into something like the long oil-less diatribe, it's not to put anyone down; it's more to explain my thought process, usually before I do things. I'm not always right and am eager to hear any opposing viewpoints - since you don't really learn anything from people agreeing with you...

That's pretty damn cool to know. Thanks. And what happened to that motor? Also, does the front plate thread in?

MSA - Actually, all of the major centrifugal manufacturers now how oil filled units - Vortech, Procharger, Torqstorm and your Rotrex. I have seen a good number of failures of these units, almost all in the gear drive. Procharger is particularly bad about this; but they undersize their gear...

Turbos generally use journal bearings, which require an oil film; there are some ball bearing units, and they tend to last longer simply because they don't need nearly as much lubrication. Pretty much all of the superchargers I've run personally were self-contained, oil-filled units. None had...

Did you press it off? Is that galling on the shaft?

I'm thinking about trying the gear drive setup, but using two or three motors all driving the same impeller gear. Much cheaper and more compact. And I wouldn't worry about lube on the gears - RC cars don't, and we're not running anywhere near as long as they do.

I'm with you on the jaw coupler - I'd use something more like what Whipples and Eatons use:

Somehow I didn't process the 700cc as the engine's displacement. I understand the need for compactness and weight in your application. You might be fine with the -04; I'm guessing your base engine power is in the 70hp range? FWIW, I'm not loving the belt drive; I'd look to gearing. Check...

FWIW, I had issues with the Vortech shaft; I haven't tried the P2 shaft. SQCTS did grind his P2 shaft down. I wish I had a hardness tester; or at least the files to test hardness with. I don't think they need to be hardened, but stiffness is probably important. That's a bit outside my pay...

To answer your question, you're correct - the engine will use less fuel at lower rpm. Though I really don't like using boost pressure as a fueling metric - a positive displacement blower engine will need more fuel than a turbo engine, and a turbo engine will need more fuel than an electrically...

If you do, let us know how it goes - one-piece shafts would be a game-changer for us all.

^lol. Well, I guess that's "disassembled." WB - I just watched your video in detail (and re-watched several parts). About the impeller shaft getting stuck on the motor shaft - did you think about levering it off, or using wedges like removing a jacob's chuck? It might damage the bearing, but...

BTW - did you do anything different with the impeller shaft?

At the risk of being redundant: Lol - nice!

I've been tied up with work - sorry. What size engine and how much power are you looking to support? 80,000 rpm under load isn't impossible, but it's not easy - unless your power goals are pretty low. One of our members here found a Sea-doo supercharger for really cheap - that might be a...

BTW - I looked at those superchargers too - I think that's an excellent idea, and congrats on the find.

Ditto

Thanks for posting pics of the rotor - I've never taken mine apart; but it's just a "normal" unit. I think you'll like those Lishen cells - they're almost impossible to get here in the states now; though SQCTS on here told me about Toshiba's new SCiB LTO EV car cells - they're pretty...

That fuel cell compressor is a great find; as for the other guy - he's been screwing around with lower power setups for a while now, but I didn't know he was stepping things up. Using twin motors/ESCs is an awesome idea. Frankly, I didn't know that would work. And his fab skills are pretty...