[quote="LJD"](quoted from post at 16:51:32 12/14/12) Nonsense. Show us one engine that came as gas and diesel and the diesel has more torque at lower RPM (with equal aspiration) I can show you many that do NOT.
Long stroke is what makes torque. Just like putting a piece of pipe on a wrench handle. Just so happens that most engines now adays with long strokes are diesels. Gas engines usually have shorter strokes to make higher RPMs.
One example of many:
Deere three cylinder engines with equal bore and stroke (except 135 gas has shorter stroke):
Long stroke and small bore and short stroke with a large bore , with the cubic inches being the same. Doesn't make beans for difference in torque and power.
The small bore engine just doesn't have the room for large valves so it can breath at high rpms like the large bore engine.
Old tractor engines tended to be tall a narrow to fit the chassis so hence the long stroke, small bore engines where small valves and small ports . Would keep airflow velocity high and assist with low rpm cylinder filling.
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