It´s already looking like the MDI Air Car will be one of the major technological discoveries of the new century. Inventor Guy Négre has developed a car capable of a top speed of 110 km/h, 300 kilometres on one tank of fuel and at a cost of just a penny per kilometre. All of this at "zero pollution". In fact the car cleans the air it uses!

The basic principles of the CAT´s 34 Engine

This engine was developed between the end of 2001 and the beginning of 2002. It uses an innovative system to control the movement of the 2nd generation pistons and one single crankshaft. The pistons work in two stages: one motor stage and one intermediate stage of compression/expansion.

The engine has 4 two-stage pistons, i.e. 8 compression and/or expansion chambers. They have two functions: to compress ambient air and refill the storage tanks; and to make successive expansions (reheating air with ambient thermal energy) thereby approaching isothermic expansion.

Its steering-wheel is equipped with a 5kW electric moto-alternator. This motor is simultaneously:
the motor to compress air
the starting motor

the alternator for recharging the battery
an electric moderator/brake
a temporary power supply (e.g. for parking)
No clutch is necessary. The engine is idle when the car is stationary and the vehicle is started by the magnetic plate which re-engages the compressed air. Parking manoeuvres are powered by the electric motor.

The CAT´s 34 P04 engine is equipped with patented variable-volume butts and a dynamic variable-volume volumetric reducer.


The dual energy system

The Series 34 CAT´s engines can be equipped with and run on dual energies - fossil fuels and compressed air - and incorporate a reheating mechanism (a continuous combustion system, easily controlled to minimize pollution) between the storage tank and the engine.

This mechanism allows the engine to run exclusively on fossil fuel which permits compatible autonomy on the road.

While the car is running on fossil fuel, the compressor refills the compressed air tanks. The control system maintains a zero-pollution emission in the city at speeds up to 60 km/h.

Articulated con-rod

The MDI con-rod system allows the piston to be held at Top Dead Centre for 70º of the cycle.

This way, enough time is given to create the pressure in the cylinder. The torque is also better so the force exerted on the crankshaft is less substantial than in a classic system.

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