Reversion to the Two-Stroke Engine

New Zealand Herald, Volume LXXVI, Issue 23333, 29 April 1939, Page 12 (Supplement)

Reversion to the Two-Stroke Engine

Theoretically, a two-stroke engine of half tho sizo of a four-stroke unit should develop the same power. On this account, and the fact that there is a considerable saving of weight and space, it is of interest to note that practical developments in this direction are beginning to make their presenco folt overseas, in both tho motor-cycle industry and tho fuel-oil typo of power units "for heavy duty commercial motor vehicles, passenger and goods. It is reported that one of the big United States of America automobile companies intends to put into production a twin cylinder two-stroke oil engine for use in some of its motor trucks. A supercharger will bo used for charging the cylinders with air. Each cylinder will have two exhaust valves, induction being through ports uncovered by tho piston at the bottom of the stroke. Developments in this direction conceivably mav have a considerable influence' on bringing about lighter-weight small sized fuel-oil engines, suitable for relatively small commercial motor vehicles that annually travel a bis: mileR g°- _______