Herald Sun - Motoring - - Ask Smithy -

QI WAS al­ways told that short­stroke en­gines rev harder, but have a shorter life, and long-stroke en­gines have more low-down grunt or torque. Is there an op­ti­mum bore/ stroke ra­tio for in­ter­nal-com­bus­tion en­gines? Phil Hid­dle

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horses for cour­ses. Short­er­stroke en­gines will rev harder and will be bet­ter at high speed, but will wear at a faster rate. Long-stroke en­gines pro­duce bet­ter low-end torque, but don’t rev as hard.

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