Quote:
Originally Posted by Barnsnake
I have a bit of a problem with the author's example. The model airplane engine is probably a cross flow two-stroke and the marine engine is a four-stroke deisel.
The airplane engine might be good for 100 hours, while the marine deisel is designed to run 50 years. Comparing apples to oranges (or is that peas to watermelons?).
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Both engines were two strokes. He discussed that bore limits port size in 2 strokes, as well as valve size in four strokes. He gave examples of large 4 stroke comparisons, too. About a half dozen examples in all. I just happened to remember the one mentioned, because the huge size difference was so striking.