Quote:
Originally Posted by oldford2
I think that 100# may slightly expand a rubber hose but it is still 100#. Not reduced. JMHO
John
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When the gauges are checked to a standard pressure and read the same---then when used to check engine compression they read different, the long soft rubber hosed ones read lower, when you move into the high end recording testers the hoses are short, metal reinforced,and the passage is filled with wires to reduce volume
When testing compression it's not as much about how high the gauge eventually gets, it's more about what happens on the first few compression strokes, and testing all the cylinders the same ---you have to remember that to fire there is only one compression stroke