You're absolutely correct... Probably the BEST DIRECT example is the Ford Basildon engines. They were designed as a diesel engine and were mostly uniform throughout the range having 3, 4 and 6 hole versions utilizing many of the same parts. These engines were then modified to spark ignition... but the bottom ends were identical. I believe the cam was also identical. Heads were similar... main difference to drop the comp ratio was in the pistons. The gasoline engines made considerably ~more~ power on the same displacement... so they generally used a bit smaller displacement on the gas engines for the same model tractor so as to keep the power level the same. I suspect that peak torque for a given displacement WAS the same but the spark engines were probably a bit more top ended on power which is why they made a bit more....
So as it applies to the previous arguement... I think if you had a direct injected spark ignition engine built to diesel specs... with a turbo... you'd probably get pretty similar performance to a diesel engine... and mabey even close to the efficiency we've known from diesel's.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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