George Mangoletsi started his design and inventing career in 1926. By 1929 he patented a Desmodromic valve gear system, some features of which were used in the 1954 Mercedes Benz W196 grand prix cars

Extract from MOTOR CYCLE November 21st 1929.
“Push-Pull” Valve Gear.
System of positive operation devised by well-known Southport Rider.

For many years efforts have been made to eliminate the springs from valve mechanism, and thus avoid valve bounce and the wear and tear of valve gear and the loss of engine revolutions which the use of the modern powerful valve spring necessarily involves. Apart from the desirability, for these reasons, of utilising positively opened and closed valves their employment allows more rapid opening and closing of the valves.

The problem has been studied for over a year by G. A. Mangoletsi of Highcliffe, Moor Lane, Kersal, Manchester. Mr. Mangoletsi, it will be remembered, is a well-known rider at Southport, and one of the select few who have handsomely exceeded the 100 m.p.h. mark on the sands there.

Desdomonic valve

The Mangoletsi gear as applied to an overhead-camshaft engine.

An experimental model based on a 350 cc racing engine of well-known make has been built, and although the head design was not ideal for the purpose the mechanism has been demonstrated to (and tested by) The Motor Cycle, and it appears to work excellently.

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George’s early experience came from the successful preparation and campaigning of one of the ex-1928 TT winning Lea Francis team cars and a Matchless ex-works 500cc bike, winning many races.

George Mangoletsi Lea Francis

1928 TT Lea Francis winning team car.

In the 1939 Monte Carlo Rally he finished 10th overall, and first British car in a works-supported Jaguar SS 3 ½ litre Saloon.

George Mangoletsi Works Jaguar

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George Mangoletsi Bulgaria

George Mangoletsi with the Jaguar SS in Bulgarian snow, 1939.
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He then developed gas carburettor systems with, rooftop, top gas-bags, which were used during wartime as official Ministry supply for public transport, buses and commercial vehicles.

By 1950 this expertise was then used by manufacturers, who in those days ran in their production engines on test beds before installing them in the chassis - Aston Martin, Rover, Rootes Group (Hillman, Sunbeam, Humber, etc) and Rolls Royce. The distribution of gas is nearly perfect, thus an engine runs so smoothly that any other problems became more evident. There were major cost savings and improved safety.

In the ‘50s the experience gained from working with gas carburation led to the design and patenting of the GM Manifold Modifier. This simple device, fitted between the carburettor and the manifold, greatly improved the distribution by atomising the fuel more efficiently, and keeping the unmixed petrol from attaching to the walls of the manifold. The modifier gave much smoother running, more torque and better fuel consumption. According to magazines, newspapers and research company tests all so-called petrol savers failed, except one, the GM Manifold Modifier. Just some of the publications stating that it is the only one that works – AA Drive magazine; What Car; Sunday Times. Motor, Autocar and Burmah Castrol all held economy competitions and, in every case, the winner was the GM Manifold Modifier.. It was also used by many major fleets: Scottish Gas, Welsh Gas, and most English Gas Boards, Schweppes, etc.

Motor magazine April 1975: “ In recent years Motor has tried a variety of economy devices- Still the only economy device we heartily recommend- Cheap to fit – Totally safe – It gave a 6% reduction in consumption on an Allegro”

By the mid-1950s the engine tuning business was started with the introduction of the Mangoletsi re-ported and polished range of manifold for production cars, to be used with standard carburettors. The GM Manifold Modifier was machined into the manifold at the intake and outlet ports. Standard manifold design was so poor in those days that significant gains were obtained in performance, drivability and economy, from just fitting these manifolds. When used in conjunction with gas-flowed high-compression cylinder heads, further substantial improvements in performance were achieved.

In1960 George’s son, John, joined the company. With the advent of Weber twin-choke high performance carburettors, the opportunity arose to develop GT versions of standard production cars, which heralded the start of the Mangoletsi range of high performance cast aluminium inlet manifolds – still the market leader after 50 years of experience, innovative design and development.

Mangoletsi exhibited at the 2nd Racing Car Show in 1960 – now the only tuning company from that show in existence.

Racing Car Show Photo

Racing Car Show 1967, Olympia

During later years the company also diversified into other motorsport and marine engine products and projects. With the rise in popularity of restoring and tuning older classic cars, and the advent of fuel injection conversions, the demand for inlet manifolds for older cars has increased. In response Mangoletsi have produced the new and updated range of manifolds and linkages



Mangoletsi polished manifolds Logo