HEAVIEST ENGINE STRAIN.
FALACY EXPLODED. Most motorists arc under impression that the downward tiling stroke of an automobile engine puts the greatest strain on the reciprocating parts. According to a well-known English motor export, this is true oiil\ when an engine is running at low speeds. When the revolutions ol the engine become high, the tensile pull ol the piston on the upward stroke represents the heaviest strain. This stress is at its heaviest when the throttle of a fast revving engine is suddenly closed, when the big and small-end hearings of each connecting rod Jiave to bring to rest and reverse, unassisted, the whole of the renoprocating parts —viz. the piston, gudgeon pm, and connecting rod, which may he moving at about 50ft a second. It is for this reason that excessive revving of an engine, when not under load, is inadvisable, and, incident® y, why seven? stresses are imposed on tl)7 connecting rods, etc., of an engine when the throttle is suddenly closed while the vehicle is travelling with a fast-moving engine.
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Ashburton Guardian, Volume 59, Issue 40, 26 November 1938, Page 9
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174HEAVIEST ENGINE STRAIN. Ashburton Guardian, Volume 59, Issue 40, 26 November 1938, Page 9
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