Friction loss is what reduces the flow and once flow is reduced, so is the resulting pressure at the other end while the cylinder is in motion. Friction loss is greater at higher flows. So working slowly it will make little difference. Friction loss is also a function of length. So a reduction from 3/4 to 1/2 over say 2 feet over a ten foot hose will have little effect. But if it is ten feet over a ten foot hose it will be a very noticeable loss of flow and thus pressure.
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Today's Featured Article - Piston Ring Removal and Replacement - by Chris Pratt. Piston Ring Removal and Replacement - Replacing rings is a fairly easy process to stretch the engines usability between major rebuilds and cut down on that blue smoke and high oil consumption. Frequently, replacing only the rings is not advisable because by the time you do the teardown and measurement of the components, the pistons are often beyond the manufacturers specification or something else you find will signify the need for a major rebu
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