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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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