Moss Motors, Ltd. British Marques Moss Motors, Ltd. Moss Motors British Cars
AH Sprite/MG Midget
Restoration and Accessory Parts Checkout
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1275 Supercharger System

The new Sprite/Midget  supercharger system uses the same Eaton positive displacement roots-type supercharger found on contemporary OE applications such as Mercedes Benz and Jaguar. In spite of its modern origin, Moss was careful to design the system to look like it was a factory-installed option that complements the classic Sprite/Midget image.  The supercharger features helical rotors and an internal vacuum controlled bypass valve for high efficiency and economic cruising.

Moss engineers designed an intake manifold that provides equal airflow, pressure and fuel mixture to each cylinder. By optimizing the distribution in the manifold for each cylinder, you can run more boost pressure without the chance of harmful detonation. The Moss supercharger system produces 5-6  PSI of boost at sea level. On our otherwise stock test car, that almost doubled the rear wheel horsepower. Bolted on to a stock engine you may expect a HP increase of 40% at the flywheel.

The Supercharger kit is very complete and includes a 4-rib serpentine belt drive system with automatic tensioner, new HS6 carburetor and a high-flow K&N air filter.

The kit will install on any 1275cc Sprite/Midget in-line engine (sorry Classic Mini Owners) and will fit with either a generator or alternator.   We do recommend upgrading to an alternator as the generator bearings will wear quickly with the increased belt loading.  We offer an alternator conversion kit that will fit any of the A-Series engines (no provision for Bugeye mechanical tach.).

Complete instructions are available in PDF format (size 1 Mb) - HERE.

See the Dyno results in PDF format (size 226 Kb) - HERE.

The installation can be completed by a competent mechanic or hobbyist with hand tools in about nine hours. 

Part #PriceDescriptionApplicationQty
150-080 $3,895.00
SUPERCHARGER SYSTEM (Order Value Discount Does Not Apply)
Note: New HS6 design kit

1275cc Sprite or Midget

150-084 $189.99
High Boost Pulley Upgrade
1275cc Sprite or Midget 1
150-086 $209.99
HEATSHIELD KIT, supercharger
Note: The woven material and the adhesive binder are very special. It took weeks and lots of testing of different products before we found the right combination - this is as close as you will get to an aero space product that is affordable. The aluminized heat barrier is made up of woven silica with a flexible aluminized finish. The highly-reflective surface of the material is capable of withstanding radiant temperatures in excess of 2000°F.
1275cc Sprite or Midget with Moss Supercharger 1
648-210 $26.99
EMBLEM, Supercharged
90-05 A/R
373-627 $39.99
NEEDLE & SEAT, Viton tipped
SU HIF44 (used in earlier supercharger kits) 1
370-756 $24.99
053-226 $123.99
K&N AIR FILTER, 4" tall tapered
HIF44 Sprite or Midget Supercharger Kit 150-088 1
052-234 $49.99
Drive Belt - Replacement
1275cc Sprite or Midget with Moss Supercharger Kit 1
052-504 $4.69
Spark Plug - NGK - Replacement
1275cc Sprite or Midget with Moss Supercharger Kit 4

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