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[quote]QUOTE: Originally posted by Overmod I might add that lots of diesels, including many of the Cummins truck engines and, I believe, at least some of the Caterpillars, are also 'crosshead' designs. This increases the effective deck height (of an inline engine) by at least the crank circle dimension. This isn't quite as direct, of course, for a V engine configuration (although in this case the engine will also be somewhat wider). My understanding is that a 'crosshead' engine can have a somewhat better rod ratio (shorter length for a given throw) because the lateral loadings aren't carried to the piston to produce "oval" wear patterns, scuffing, etc. There is little doubt in my mind that such an engine will have greatly better life compared to one with a conventional gudgeon-pin connection directly to a connecting rod! [/quote] I should check, but I think you might be reffering to crosshead pistons, which are actually two piece pistons, the thrust is taken by the skirt and not the crown because they are articulated separately on the piston pin or gudgeon pin, this is different than a two piece piston where the crown is separate form the skirt, but is not articulated separately. Recently I took a course as a refresher, and saw the pistons for the newest Series 60 Detroits, and they are so short, I thought it was a mistake and I was looking only at the top part of a two piece piston - no! it's the whole piston! Over the last ten years, piston skirts have been getting shorter, and top ring lands higher, this thing was practically skirtless! unbelievable!
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