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Aviation History
1937
1937 - 0621.PDF
MARCH II. 1937- ADVERTISEMENTS. FLIGHT. SUPPLEMENT vii. We don't want to bore you BUT WE THINK YOU OUGHT TO KNOW In long chains ordinary petrol molecules burn too quickly In the old days the thing was to get a petrol which would burn (or explode) as quickK as possible. This was all right until engineers found that the way to get more power from a given engine was to increase its compression ratio. They then found that this increased cylinder pressure caused ordinary petrol to explode too soon. This detonation or "pinking" caused loss of power and over-heating. .-•m PM SHELL "RE-FORMS" THE MOLECULES INTO COMPACT GROUPS The problem, then, was to produce a petrol which had a rate of burning suited to the modern engine. Shell has solved this problem by changing its molecular structure. This is done by a process called "re-forming.'' "Re-forming" takes the atoms of carbon and hydrogen, which are present in all motor spirit, and puts them together in compact groupings instead of in long chains as they are in ordinary petrol. In this condensed formation they combine regularly and evenly (instead of spasmodically) with the oxygen supplied by the air from the carburettor; thus combustion is controlled and "pinking" prevented. In this way Shell offers you the advantages-of a pure petrol in a form suited to the modern engine. YOU CAN BE SURE OF SHELL Kindly mention "Flight" when corresponding with advertisers.
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