Abstract
Without introducing novel technology, the advantages of the Cross cool-combustion chamber have been combined in a compact engine form. This has enabled a practical engine to be developed in a comparably smaller envelope than would be possible with a conventional arrangement. An eccentric crank mechanism is used, which eliminates swinging connecting rods and thus generates simple harmonic motion at the pistons.
The Cross rotary valve enables the bore-stroke ratio to be reduced significantly without combustion penalty and a bore-stroke ratio of 1:7 has been chosen for a prototype. The practical development of this engine is described, together with the rationale of its conception.
In the present climate of fuel shortage, it is anticipated that low fuel consumption and octane requirement, which have been well demonstrated for the Cross combustion chamber, will be of considerable importance, while the compactness of the complete engine should offer significant installational advantages.
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