Axles and Diff M G B
The following formula shows how to calculate your road speed per 1000 revs: S = E x W x 60 E is engine speed in revolutions per minute W is the distance travelled by a fixed point on the circumference of the wheel during one revolution. If you want S in mph you must use W expressed as a fraction of a mile. For kph use W as a fraction of a kilometre. As a guideline, for a 165 R 15 wheel, W = .001239 miles or .001962 kilometres. For absolute accuracy in relation to your own car, put a chalk mark on the wheel at ground level and a similar mark on the floor. Then push the car forward until the mark is again at the bottom of the wheel, make another mark on the floor and measure the distance between the two floor marks. Normal tyre pressure and loading assumed. G is the gearbox output ratio, e.g. the standard Magnette first gear is 3.64, top is 1.0 D is the differential ratio e.g. the standard ZB figure is 4.55, the ZA is 4.875
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