In CM of December 6 1968 in a road
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test report on the Ford DT1400, and on January 76 7970 in a report on the road test of a 01000 Ford the following figures were quoted:—
ITEM D1000 DT1400 Axle Ratio: 6.14 6.50 Engine maximum speed: 2,800 rpm 2,400 rpm Tyre size: 10.00-20 10.00-20 Transmission top gear: 1 to 1 1 to 1 Maximum road speed: 60 mph 50 mph On the basis of the usual formulae given for maximum road speed, the 01000 should do 53.6 mph at 2,800 rpm and the DT1400 should do 43.4 mph at 2,400 rpm. Would you please explain to me how your maximum road speeds are derived?
AMaximum road speeds and gear speeds quoted in road tests are always as checked on the road and corrected for speedometer error.
Working to the details for the D1000 and DT1400 models road tested, and referred to by you, we make the road speeds at maximum governed engine speed 44.5 mph for the DT1400 and 54.8 mph for the D1000: from our information, 10-.00-20 tyres cover 492 revs per mile.
The road test figures of 50 and 60 mph respectively can be explained by the fact that there is always "run out" above the full-load governed speed, and in the case of the engines in the chassis tested the figure was in the region of 300 rpm, which is not excessive.