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During the year 1930 there was one engine which as on hype named as 'Ricardo' sleeve valve engine. Mirrlees the period introduced two Mirrleesengines represented this patent type of the valve engine. Well the first sort had bore of about 5.5 inches and designed a stroke of just about 6.5 inches and produced 20BHP each cylinder at rate of 900 r.p.m. the other had 17 inches bore and 21.5 inches stroke, giving 50BHP per cylinder in the rate of 200 r.p.m. 3. Lasts Longer: All there is certainly in the electric motor can be a coil and drive-shaft, as opposed to the a huge selection of moving parts in a traditional combustion engine. As well as being ultra credible the motor will last many years. With less moving parts to think about there exists little that they'll not go wrong.