Dont forget that you will need a bypass at high RPM otherwise you will loose power over N/A due to the pressure drop through the compressor at high air mass flowrate
The motor on that is only 5kW so you would need at least 2 of them, probably 3 to achieve the desired results. Also I am dubious that that system would be capable of running flat out for minutes at a time reliably
If you make a T section upstream of the valve then normal operation it is open and the air will pull from atmosphere and through the stationary supercharger. When you want boost, shut the valve and the ait will only be drawn through the supercharger
Not sure if that ESC could handle 300A for 5min you would have to look at the spec
Bypass is not too difficult but does require some engineering and a control system. I made one on my twincharged application (have a look on this forum)
You need to look at the compressor map of whatever you want...
A very rough calculation is 1.5kw per L displacement per 1000rpm for 0,5bar boost, In you case that would equate to about 13kw @ 3000rpm for 0.25bar boost (3.6lbs). That will require 270A so I would say that is possible if you find the right supercharger with the right cables and battery...
My twincharged engine can produce 1.7bar abs pressure at 1500rpm or (or less if necessary) and although does obviously produce significantly higher cylinder pressures than naturally aspirated, it is mapped accordingly and hence the ignition timing is retarded and the lambda is set run...
I think you may need to make a new end cap in this instance, otherwise you would probably have to line bore the motor housing and backplate whereas you could make the bearing bore concentric with the spigot diameter on the new end cap
The brass bushings are to control the end float. When I cut the rotor down I had to make a new one to get the correct end float. Also I deliberately put a very small flat on the end of the shaft to allow the air out as the extension shaft was shrunk on.
If precise shrink fits do not work and create concentricity or other issues then we would not be able to fly anywhere in planes, drive around in cars or do be able to do nearly anything else that involves rotating machinery. Of course it works perfectly well if done properly.
I presume the bore is drilled and reamed WITHOUT removing it from the lathe i.e the bore is machined in the same setting as the shaft where the compressor wheel is mounted. I have successfully mounted an extension shaft on a motor with a flat on. In fact you do need a slight flat on the shaft...
This is a very quick estimate of what you may get with a single TorqueAmp on a 4L engine with no bypass. As you can see it is not too bad but I think the loss would likely be more than predicted without a bypass valve
I guess if you are only after a small gain at lower speed and you bypass the supercharger at the higher speeds it will be OK. Probably two of them in parallel would be better though. I use a very very rough calculation of 1.5kW per L displacement per 1000rpm for 0.5bar boost
I think you need to calculate how much power you need to supply the boost you require for your 4litre engine. You will be surprised (or maybe not) It will be massively more than that TorqAmp can supply
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