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diminished horespower in rebuilds
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The Detroit 71 series manual has a section with an illustration showing a vacuum test of the piston pin bore to ensure air tightness. In my experience as a technician, this is archaic, because nobody assembles power packs anymore, only preassembled power packs are installed, but it does show that it is important to stop communication between the skavenging ports and the crankcase. <br /> <br />As a technician, I have never heard of backpressure having to be measured, but it is probably of concern to an engineer. I imagine backpressure after the turbo is more important for everyday consideration. For an engineer, it would be usefull to compare exhaust backpressure before the turbo to boost pressure on the cold side to determine a turbo's efficiency. Backpressure may be higher because of a turbo, but so is intake pressure and combustion pressure, so really the question is, "Does the relative differences in pressures change?", and this is probably a reflection of a turbo's efficiency.
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