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I would suggest you check the internet for "forced induction" for your particular engine. (What does aftermarket "do here" ... any kits running reliably for "non built" engines?) Some engines simply do not have much structural strength even for low boost (5-6 psi). Conrods, pistons and bottom...

The BIG difference is : when you drive a charger from the crankshaft then you NEED to overdrive it to get into the efficient area of the map! Whereas here we are looking at eMotors which can spin to about 40-50k rpm already ... some smaller screamers to even more (but mostly with less...

@AlexLTDLX ... you know this US company?: http://www.powerdesigns.ca/ (yeah ... nowadays companies who do not have AI or robotics in the name have a disadvantage ... but they DO exist ;) )

how much displacement does your yanmar disel 3 banger have? what are is the rpm range?

on an electric boost device you have lots of degrees of freedom how to set your duticycles ... much more than with a mechanical setup. And since your requirements can be met with a relatively small device ... electric power consumption will ne far less than with the setups we are exploring...

On a serious note: In my lifetime I never felt as close / on the brink to ... WW3 ! ... and we are still pursuing our lives (and projects!). Is this human "denial"? Man ... really praying that no "other crazy dog" (and we have some in the political landscape) now thinks : "time to fxxx up ...

My pulleys came without hole... but look nicely machined. I assume the can be pretty well centered (looks like). I would ask a machine shop to clamp them into a lathe and do some testing with some rotation. Just boring through is prone to error I would say.

I would start with the smallest pulley for max torque and see what max rpms you get against the 1" restriction. (a defined constant across all experiments) ... that would be systematic. (Then step up to see if you can overcome a certain load wall ... iteratively) BUT you can save time by...

Hey welcome! All our cars are already "hybrid", no? (or does anyone here have a fuel pump which is not electric? 😉 We are just adding an electric air pump ...)

at some point we even brainstormed (on a very shallow surface) EDFs and this: https://www.axialflow.com/history.htm

fingertip? go for Kidney! 🤣

oh ... and one more thing: https://www.castlecreations.com/neumotors not sure though how much "Neumotor" is in the 1721 though 🤔

and

you might find this motor attaractive for your high rpm demands: https://www.castlecreations.com/en/castle-1721-5y-sensored-motor-2400kv-060-0091-00

you want to look at this motor: https://www.castlecreations.com/en/castle-1721-5y-sensored-motor-2400kv-060-0091-00

pg35+ ... not only towels and diapers needed here 😛

oh ... and one more thing @AlexLTDLX : what is your current setting for switching frequency? ( in FOC mode a higher value than 20kHz (40,60) seems beneficial for the top speed as well! in DC (BLDC) mode going higher than the default 20kHz needs possibly good cooling of the powerstage!)

more interesting info regarding BLDC (DC) mode on VESCs: https://vesc-project.com/node/2646

https://trampaboards.com/1x-vesc-75v-300a-black-anodised-non-conductive-cnc-housing--the-most-powerful-vedder-electronic-speed-controller-ever-p-26627.html there is a chinese version on alibaxpress as well ... but a) much more expensive and b) not sure you'll get the full support and software...

The VESC is on my shopping list! Just the darn decision to do: a) with my 6pole 5860 1000KV TP motor? b) get a sensored ~900Kv LMT 2pole 3080? need to get that 6/3 connections solved without dropping kv too much... FAVORITE! (and sell tye brand new TP to a RC enthusiast 🤣) (c) skip VESC and...