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 The Judson Supercharger: history and technics

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MessageSujet: The Judson Supercharger: history and technics   Mar 1 Juin - 21:23

From our friend John Moxon, Judson Registry master, and vintage speed specialist:

THE JUDSON SUPERCHARGER



Since 1880 the Judson Family have been involved in some form of mechanical and electrical engineering.
It's a story of enterprise and innovation, from farming machinery through to electronics for the defence and automotive industries. Of course stationed along the route was the Judson Supercharger, a product that was a natural spin-off from a Judson brothers hobby. William H and Charles A Judson had long been producing custom made racing superchargers in their spare time.
These “hobby” superchargers were popular enough to suggest a business to the two engineers and so a supercharger manufacturing unit was set up as part of “Judson Bros” of Collegeville PA, their company that made farming machinery and eventually merged into one parent company; “The Judson Research and Manufacturing Company” of Conshohocken Pennsylvania. W. Haddon Judson was listed as Director of Research of the company and his brother Charles A Judson President and Technical Personnel Director...who did what is not clear but both were experience engineers.
The company developed production superchargers in the early '50s starting with a sliding vane supercharger for the popular British MG TD sports car. A new supercharger followed for the Flathead Ford V8 in 1954.

Both superchargers sold tolerably well but the breakthrough came when in 1956. A version was produced for the Volkswagen and with the explosion in popularity of the Beetle in the U.S. and worldwide, production was moved to a new factory to cope with the increased demand.
The two VW types were a natural progression. The Judson Type 1, introduced in the spring of 1956 was for the 30/36hp engine and the Judson Type II for the revised 1200cc 34/40hp unit introduced in August 1960. For the Karmann Ghia the kit included an aluminum air scoop for the deck lid but in all other respects the same Judson kits would fit Beetle, Bus and Karmann Ghia.



The Judson Supercharger, as a low pressure unit keeps stresses to a minimum...the Judson produces it's extra power, like all superchargers at stock engine speeds, through more efficient cylinder filling and not through spinning the engine faster. Despite these facts the official Volkswagen line was against any modification of its engines and took a hard line with many VW dealerships who offered Judson kits as an unofficial accessory.
The Judson is a sliding vane unit, belt driven from a supplementary pulley coupled with the stock crankshaft pulley. It compresses the mixture from the carburettor by means of a series of four sliding vanes located on an eccentrically positioned rotor. As the rotor spins the vanes are thrown outwards and seal against the wall of the supercharger, pressurising the mixture and pushing it into the intake manifold. As a result the volume of air/fuel mixture supplied to the combustion chamber is significantly increased, overcoming the restricted breathing of the normally aspirated engine.
A lubricator bottle is an integral part of the Judson set-up. It supplies an intravenous drip of oil to lubricate the phenol impregnated linen vanes of the supercharger and is burnt with the fuel mixture in the combustion chambers. At the same time this oil also acts as an upper cylinder lubricant.
So on the question of reliability a Judson Supercharger doesn't overstress the stock flat four as it doesn't produce the extra performance by extending the rev range. In most cases, the Judson Supercharged engine is certainly more efficient, often cleaner running and better lubricated.



Performance figures for the 36hp Judson Model came in the September 1957 issue of “Road & Track” magazine. A top speed of 83.8mph was 13.5mph better than stock and the 0-60mph figure of 18.0 seconds slashed a full 10 seconds off the standard 36hp time but as with all superchargers it's the mid-range torque that produced the most useable power gains.

Today the Judson Supercharger is the easiest vintage supercharger to find and the easiest to restore. Spare parts are available and previously unattainable parts like replacement rotors and reproduction Boost Gauges can be easily found on the Internet. There are two well known specialist restorers in the USA and Europe, you can find them on the “Buy & Sell” page of The VW Judson Register: http://vwjudsonregister.tripod.com/buyandsellpage.htm where you'll also find Judson parts suppliers.
Summing up; the attraction of the Judson back in the 1950s and '60s was that you could fit it on a Saturday afternoon and drive your newly supercharged car to work on the Monday morning. The Judson Research & Manufacturing Company pitched the price of the complete VW Kit at around the $100 mark making it the best value performance kit at the time. That's why they sold more VW Judson Kits than all the other supercharger kits put together...over 70,000 in all over a period of 16 years.

J.M.




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MessageSujet: Re: The Judson Supercharger: history and technics   Lun 28 Oct - 17:27

Sinon, pour ceux qui veulent relever des défis sympas en Vintage Speed, y'a ça: le double Judson!!! affraid 

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MessageSujet: Re: The Judson Supercharger: history and technics   Lun 28 Oct - 18:37

Shocked ah oui quand meme!

j'avais jamais vu ca! c'est une adaptation ou ce kit a vraiment existé? scratch 
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MessageSujet: Re: The Judson Supercharger: history and technics   Lun 28 Oct - 19:13

ralfoune a écrit:
Shocked ah oui quand meme!

j'avais jamais vu ca! c'est une adaptation ou ce kit a vraiment existé? scratch 

c'est un double Kit judson donc une adaptation a voir sur le capot moteur pour les carbu

c'est du home made ça non ?
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MessageSujet: Re: The Judson Supercharger: history and technics   Lun 28 Oct - 19:19

il y avait les porsche bi turbo ,et maintenant ,c'est les coccinelles bi compressors lol
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MessageSujet: Re: The Judson Supercharger: history and technics   Lun 28 Oct - 21:30

T'as des infos sur les perfos ? Pas sûr que cela apporte grand chose Suspect .

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MessageSujet: Re: The Judson Supercharger: history and technics   Mar 29 Oct - 12:01

Eric pourra peut-être nous dire ce qu'il en pense...
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