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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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