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Is the Judson supercharger a real plus.......??? At $20M "buy it now" you have to wonder.
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The Judson was a sliding vane type pump. It had four paddle wheels, vanes, that slid against the inside of the housing as the off center belt driven rotor turned. It required external oil injection into it to lubricate the vanes as they rubbed on the housing & in the rotor slots. Oil injection reduces the effective octane rating of the fuel, in a situation where increased octane was actually needed.
The manifolding was quite restrictive & gave uneven fuel distribution to the cylinders.
Boost pressure was limited to around 7 psi. This boost pressure when combined with the large heating effect of the vane friction gave a net air density increase of around 18%. Since air density increase is what creates horsepower increase, the net gain would be around 18% or 12 horsepower, assuming the original engine was rated at 65 HP.
The Judson was high maintenance due to the need to frequently replace the vanes & drive belt as they wore. The external oil supply had to be topped up frequently.
I spent a long time trying to get something out of a friends Judson supercharged Sprite in the early 60's. Never was worth the trouble since more power could be had with the conventional methods.
A real plus? Not very practical, not much power gain, an interesting curiosity from a bygone time. Some folks would love to show such a curiosity. You would have to be the judge. I know that the seller claims 100 HP, but it is wildly optomistic.
D