A reasonable comparison might be the Ford Jubilee/NAA (Nebraska test 494) versus the Ford 8N (test 443).
The 8N produced 26 hp @ 2000 rpm from 120 cubic inches. The Jubilee produced 31 hp @ 2000 rpm from 134 cubic inches.
The specific fuel consumption was similar for the two tractors: .55 lb/hp-hr for the 8N, .56 for the NAA. This can be explained by the fact they have almost identical compression ratios (6.5 and 6.6).
With the 601 series (test 642), Ford raised the compression ratio of the 134 engine to 7.5. That increased power to 34 hp @ 2000 rpm, but (surprisingly) increased specific fuel consumption to .61 lb/hp-hr.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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