A fore or aft motion of the wiper switch stalk engages or disengages the unit. Less in overdrive certainly offers some savings.Īll MGBs 1968 – 1976 were fitted with the overdrive switch and wiring. Of course, turning the engine requires some power – and turning it 500 rpm Pushing air out of the way of the front of the MGB is the significant function of the engine.
This is doubtful as the energy necessary to propel the MGB along the highway remains constant, no matter the speed of the engine. Sales literature during the Seventies suggested dramatic fuel savings by using the overdrive. While the durable B-series engine can and does power the MGB at continued speeds of 80 mph without overdrive, the Laycock overdrive offers “POM” (Peace of Mind) and slight mileage savings.
This coveted option adds a fifth gear, lowering the engine rpm to about 3000 at 70 mph. Overdrive was fitted to a very small percentage of the MGBs sold in North America, and certain not to “all” MGBs 1975-1980 as erroneously reported by some authors. OVERVIEW on OVERDRIVE (From University Motors Ltd) The MGA With An Attitude
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