I had a conversation with a John Deere representative at the time the 9000 series four wheel drive tractors were introduced. As I recall, the 9100 had the 8.1 liter engine, the 9200 had the 10.5 liter engine, and the 9300 and 9400 both had the 12.5 liter engine. The 10.5 liter was discontinued not long after the introduction. In my conversation with the JD rep, he had indicated Detroit Diesel and JD Power formed some sort of a joint venture in diesel engine development, and after he said this, I recall reading that back in the early to mid 1980's. The 10.5 and 12.5 liter Deere engines came out that joint effort, and the 60 series Detroit also came out of that joint venture. If I remember correctly, the first two 60 series Detroits were 11.1 liter and 12.7 liter displacement engines. I managed to acquire a JD power brochure on the 10.5 and 12.5 liter engines, and also the brochures on the 60 series Detroits when they were introduced. It has been some time since I have looked at either one, but I would agree they look very similar, as they were jointly developed and engineered by John Deere and Detroit Diesel. This joint effort, or venture, was ultimately discontinued. Some of my reading indicates the two wanted to develop a basic engine design together that could utilize newly developing and common fuel management systems being worked on by Bosch. If you do an internet search, there is some interesting reading about these engines and some on the joint efforts. I remember talking with the first truck owner/operators who switched from Cat or Cummins powered trucks to the new 60 series Detroits and they indicated there was a definite edge in fuel mileage as compared to what they were accustomed to with their prior power plants.
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