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Judson supercharger

Discussion in 'Rootes Racing' started by Limey, Jun 25, 2021.

  1. Limey

    Limey Gold Level Sponsor

    Hi All,

    Another side project is fitting a Judson supercharger. The one they made for the MGA is almost suitable. Will need an inlet mod or two. Has anyone done this before? It is fairly low pressure so no head mods required I believe. Any thoughts good or bad gratefully received.



    Attached Files:

  2. DanR

    DanR Diamond Level Sponsor

    Rather odd looking contraption:)

    What engine and transmission ?
  3. Limey

    Limey Gold Level Sponsor

    The pics are of an MGA with a Judson supercharger fitted. They were fitted to Corsairs, Spridgets, Sprites and Beetles in period, from late 50's on.
  4. Gordon Holsinger

    Gordon Holsinger Diamond Level Sponsor

    I remember back in the early 1970’s there was a sim lance of a club and there was a guy that took an iron head engine and was adapting a super charger from I think it was from a Pontiac starfire!
  5. puff4

    puff4 Diamond Level Sponsor

    It so happens that Haddon Judson was an old acquaintance of mine, and the company had its manufacturing plant in nearby Conshohocken, PA . When he closed up shop he invited me for lunch and gifted me with a brand new Judson supercharger for one of my Sprites, along with a pile of spares and other goodies. It's destined to go onto my Morris Minor Traveler once I've completed the restoration.

    The Judson supercharger is a vane-type blower and as such it's a wee bit noisy and requires an oiler. They can be tricky to fit to cars which they weren't made for, in that the diameters of the pulleys needs to be sorted so that the correct ratio is achieved. Having said that, they are pretty neat and do add a fair bit of bang to the performance, mostly in the bottom end.
    ernestovumbles likes this.
  6. husky drvr

    husky drvr Platinum Level Sponsor


    Looks to be a fun project. My only real concern would be the damper to crank connection which is problematic in stock form and usage. Trying to drive a supercharger without finding a way to improve and strengthen the damper/crank connection could prove to be a frustrating exercise.

    Have fun,

  7. Limey

    Limey Gold Level Sponsor

    Thanks Kevin, lucky you to get a new one! I researched an MGA owners site which has a good section on MGA/Judsons including converting to SU's. He to had to fettle some, especially the pulleys. I expect a pair of custom pulleys may be needed and I can see a mod or two on the inlet manifold. It will be an interesting project I think. Eminently 'do-able'
    Last edited: Jun 25, 2021
  8. Limey

    Limey Gold Level Sponsor

    They were made to be bolt on and not to overstress any components. So far I have not picked up on any issues from owners. One has had one on his Sprite for 15 years. They made over 60,000 back in the day apparently and only generate 5.5lb boost so reliability will be fine tho' I expect a lot of fiddling will be required.

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