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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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