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Message: [QUOTE="Charles, post: 308199, member: 103"] Picking a compression ratio is a lot like picking a nozzle or a camshaft profile. An engine designed to run at part load the vast majority of it's life needs the static compression ratio to be relatively high, so that efficiency is good under those low power, low boost conditions. The efficiency at full power is a bit lower because of the pumping losses of the extra compression when there was plenty of boost for the needed cylinder pressure at higher power levels. An OTR engine is desgined to run at near, or actually at full load nearly the entire time. So it doesn't need to focus on low power efficiency. So they drop the compression ratio, and the boost brings things back in check under power. They are not efficient at part load though, where they rattle and blue smoke due to lack of cylinder pressure when off boost. A high CR engine is focused on low power, off boost efficiency. A low CR engine is focused on high power, on boost efficiency. [/QUOTE]

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