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There will be some variation in usable HP - particularly drawbar HP with transmission ratios, losses, and tire size, but belt HP will be less affected by the differences between B, RC, C, and CA all of which used same basic engine. Original B was BE 116 ci, later B tractors (B64501-up) and RC, C, CA were 125 ci. Fuel - gas (G and GA suffix) vs distillate (K suffix) will make a big difference. Also governed speed RPM, and compression ratio will have an effect with later CE engines with PA Suffix being highest CR, RPM, & HP. 1938 B3712 BE3483 116.1 ci 1400 rpm on distillate max brake (belt) HP 15.68, max drawbar HP 12.97; SAE belt HP 13.86, SAE drawbar HP 10.16 1939 RC3004 R3060K 125.2 ci 1500 RPM on distillate max brake (belt) HP 18.21, max drawbar HP 15.25; SAE belt 16.16 HP, SAE drawbar 12.09 HP 1940 C81 CE93G 125.2 ci 1500 RPM 5.75:1 CR on GAS max brake (belt) HP 23.30, max drawbar HP 18.43; SAE belt 20.24 HP, SAE drawbar 14.06 HP 1950 B73430 CE128908G 125.2 ci 1500 RPM 5.75:1 CR on GAS max brake (belt) HP 22.25, max drawbar HP 19.51; SAE belt 19.44 HP, SAE drawbar 15.45 HP 1950 CA12 CE138073GA 125.2 ci 1650 RPM 6.25:1 CR on GAS max brake (belt) HP 25.96, max drawbar HP 22.97; SAE belt 22.63 HP, SAE drawbar 17.66 HP. This is probably a pre-production engine configuration as CA parts book shows 5.7:1 CR prior to CE153962 and 6.25:1 CR beginning CE153962 & up. The later PA suffix motors were introduced into both B and CA tractors in 1951 - believed at motor s/n CE153962 with the 6.25:1 CR but were never involved in a Nebraska test.
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