2 replies to this topic

[Don Capps]

Well, Sports Fans, here it is, what maybe two or three or have long waited for -- the sliding scales of weights and displacements that the AIACR CSI issued forth for the international formula that went into effect with the 1938 season. It comes from the 1946 entry blank for the International Sweepstakes:

Piston Displacement and Supercharged Minimum Weight
Increasing by 1.9280 kilograms/ 4.25 pounds for each 10 cc/ 0.61 cubic inch of displacement

40.639 cu. in. (666 cc) 881.840 lbs. (400.000 kg)
42.714 cu. in. (700 cc) 896.291 lbs. (406.555 kg)
48.816 cu. in. (800 cc) 938.795 lbs. (425.835 kg)
54.918 cu. in. (900 cc) 981.300 lbs. (445.115 kg)
61.020 cu. in. (1,000 cc) 1,023.805 lbs. (464.395 kg)
67.122 cu. in. (1,100 cc) 1,066.309 lbs. (483.675 kg)
73.224 cu. in. (1,200 cc) 1,108.814 lbs. (502.955 kg)
79.326 cu. in. (1,300 cc) 1,151.319 lbs. (522.235 kg)
85.428 cu. in. (1,400 cc) 1,193.823 lbs. (541.515 kg)
91.530 cu. in. (1,500 cc) 1,236.328 lbs. (560.795 kg)
97.632 cu. in. (1,600 cc) 1,278.833 lbs. (580.075 kg)
103.724 cu. in. (1,700 cc) 1,321.338 lbs. (599.355 kg)
109.836 cu. in. (1,800 cc) 1,363.842 lbs. (618.635 kg)
115.938 cu. in. (1,900 cc) 1,406.347 lbs. (637.915 kg)
122.040 cu. in. (2,000 cc) 1,448.852 lbs. (657.195 kg)
128.142 cu. in. (2,100 cc) 1,491.356 lbs. (676.475 kg)
134.244 cu. in. (2,200 cc) 1,533.861 lbs. (695.755 kg)
140.346 cu. in. (2,300 cc) 1,576.366 lbs. (715.035 kg)
146.448 cu. in. (2,400 cc) 1,618.870 lbs. (734.315 kg)
152.550 cu. in. (2,500 cc) 1,661.375 lbs. (753.595 kg)
158.652 cu. in. (2,600 cc) 1,703.880 lbs. (772.875 kg)
164.754 cu. in. (2,700 cc) 1,746.384 lbs. (792.155 kg)
170.856 cu. in. (2,800 cc) 1,788.889 lbs. (811.435 kg)
176.958 cu. in. (2,900 cc) 1,831.394 lbs. (830.715 kg)
183.060 cu. in. (3,000 cc) 1,873.898 lbs. (849.995 kg)

Piston Displacement and Non-Supercharged Minimum Weight
Increasing by 1.285 kilograms per 10 cubic centimeters/ 0.61 cubic inches of displacement

61.020 cu. in. (1,000 cc) 881.840 lbs. (400.000 kg)
67.122 cu. in. (1,100 cc) 910.169 lbs. (412.850 kg)
73.224 cu. in. (1,200 cc) 938.498 lbs. (425.700 kg)
79.326 cu. in. (1,300 cc) 966.827 lbs. (438.550 kg)
85.428 cu. in. (1,400 cc) 995.156 lbs. (451.400 kg)
91.530 cu. in. (1,500 cc) 1,023.485 lbs. (464.250 kg)
97.632 cu. in. (1,600 cc) 1,051.814 lbs. (477.100 kg)
103.724 cu. in. (1,700 cc) 1,080.143 lbs. (489.950 kg)
109.836 cu. in. (1,800 cc) 1,108.472 lbs. (502.800 kg)
115.938 cu. in. (1,900 cc) 1,136.801 lbs. (515.650 kg)
122.040 cu. in. (2,000 cc) 1,165.131 lbs. (528.500 kg)
128.142 cu. in. (2,100 cc) 1,193.460 lbs. (541.350 kg)
134.244 cu. in. (2,200 cc) 1,221.789 lbs. (554.200 kg)
140.346 cu. in. (2,300 cc) 1,250.118 lbs. (567.050 kg)
146.448 cu. in. (2,400 cc) 1,278.447 lbs. (579.900 kg)
152.550 cu. in. (2,500 cc) 1,306.776 lbs. (592.750 kg)
158.652 cu. in. (2,600 cc) 1,335.105 lbs. (605.600 kg)
164.754 cu. in. (2,700 cc) 1,363.434 lbs. (618.450 kg)
170.856 cu. in. (2,800 cc) 1,391.763 lbs. (631.300 kg)
176.958 cu. in. (2,900 cc) 1,420.093 lbs. (644.150 kg)
183.060 cu. in. (3,000 cc) 1,448.422 lbs. (657.000 kg)
189.162 cu. in. (3,100 cc) 1,476.751 lbs. (669.850 kg)
195.264 cu. in. (3,200 cc) 1,505.080 lbs. (682.700 kg)
201.366 cu. in. (3,300 cc) 1,533.409 lbs. (695.550 kg)
207.468 cu. in. (3,400 cc) 1,561.738 lbs. (708.400 kg)
213.570 cu. in. (3,500 cc) 1,590.067 lbs. (721.250 kg)
219.672 cu. in. (3,600 cc) 1,618.396 lbs. (734.100 kg)
225.774 cu. in. (3,700 cc) 1,646.725 lbs. (746.950 kg)
231.876 cu. in. (3,800 cc) 1,675.055 lbs. (759.800 kg)
237.978 cu. in. (3,900 cc) 1,703.384 lbs. (772.650 kg)
244.080 cu. in. (4,000 cc) 1,731.713 lbs. (785.500 kg)
250.182 cu. in. (4,100 cc) 1,760.042 lbs. (798.350 kg)
256.284 cu. in. (4,200 cc) 1,788.371 lbs. (811.200 kg)
262.386 cu. in. (4,300 cc) 1,816.700 lbs. (824.050 kg)
268.488 cu. in. (4,400 cc) 1,845.029 lbs. (836.900 kg)
274.590 cu. in. (4,500 cc) 1,873.358 lbs. (849.750 kg)


It was a pain to type, but I had to do it anyway for my own research, so here it is. I hope it helps somebody.

[scheivlak]

Great work, Don! This is a real formula!
This idea could still be fun - though perhaps with some different values and ratios.....
Was it still in use in some post-1950 events who are now called "Formula Libre" or am I way off the mark?

[karlcars]

This will definitely help yours truly, Don. Well done!