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Judson Supercharged BE at Auction

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HealeyRick said:
Project bugeye coming up for auction in Buffalo in August: https://www.schultzauctioneers.net/Auction025.htm Other Spridgets as well and a bunch of other stuff.
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Wow, Rick, that guy had a heck of a collection. I dated a girl whose dad had a 1911 Overland speedster. It was lost in a fire and the one this guy had is one of two known to exist! Now I know why her dad was never the same after that car went up in flames!
Kurt.
 
Yes, what a collection! I wonder which of all these cars the owner drove? For me it would be on of the Jag drophead 120-140s.
Scott in CA
 
Looks like there is something for everyone in that auction.

What kind of power increase would one see with a supercharger? Would it bring the 948 up into 1275 territory?
 
We can't get gas unless you can find Aviation Gas that is high enough octane anymore.
 
I believe the Sprite 948 with a Judson was rated at 65HP....same as a 1275.

Kurt.
 
Not bad -- a 40% increase in HP. I guess a similar installation on a 1275 would yield around 90 HP. It sounds like there would be detonation issues unless you ran it on AvGas or Racing Fuel, though.
 
Doesn't pump enough air for a 1275 unless it is over driven. Then heat becomes more of an issue.
 
I had a Judson on a 190SL many years ago. IIRC it would put out about 7 or 8 psi. Did not turn it into a 300SL but enough to seriously feel the difference. The vanes were too noisy though even with excessive oil drip. Also, regulating that oil drip was pretty fussy.
 
nomad said:
I believe the Sprite 948 with a Judson was rated at 65HP....same as a 1275.

Kurt.
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Maybe, but it won't perform the same as a 1275, and if it's a HC engine, things will get very hot. The stock carb on it is terrible and allows full to pool in the manifold when idling. On takeoff, you'll have a big black cloud of smoke. You'll get better results with a custom manifold and adapting an SU.
 
Gerard said:
Maybe, but it won't perform the same as a 1275, and if it's a HC engine, things will get very hot. The stock carb on it is terrible and allows full to pool in the manifold when idling. On takeoff, you'll have a big black cloud of smoke. You'll get better results with a custom manifold and adapting an SU.
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I agree, Gerard. A fellow in our local club has a Judson on a BE and it is a can of worms. All he can say about it is it look's cool! The Roots type is a better compressor than the Judson vane type.

Kurt.
 
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