Have to compare a gas and diesel with identical ports, manifolds , valves and the biggy, CAM timing. The diesels have very short cam duration and valve overlap . That they build lots of cylinder pressure at low rpms but fall on their face and starve for air when reved up. Can"t put a gas cam in an ordinary diesel as the valves will hit the pistons at TDC . If the pistons had deep enough valve reliefs cut to allow long duration and overlap. The compression and expansion ratio would drop to the point where cold starting would be difficult. We all have seen these long duration cammed diesel puller engines that make lots of high rpm HP. However starting requires a high powered starter, pull starting and/or a snort of ether. The compression ratio is low due to cam duration and high manifold pressure.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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