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FJR Motorcycle Forums
Technical & Mechanical Problems
How do you precisely measure engine vacuum?
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<blockquote data-quote="ionbeam" data-source="post: 281545" data-attributes="member: 277"><p>My Morgan instructions say to adjust the tube length until the rods just slightly oscillate to prevent stiction. My Motion Pro instructions say to adjust tube length until pulsing stops. My Motion Pro is virtually rock stable, Morgan oscillates.</p><p></p><p>Morgan says: "There will always be a small amount of fluctuation and this is necessary for the gauges to work properly."</p><p></p><p>If you need absolute vacuum accuracy use a mechanics gauge with an inline restrictor. Use a solid wood dowel or plastic rod on a dill press with a vice. Start with a hole around #79 .0145". The restrictor will serve to average the readings.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 281545, member: 277"] My Morgan instructions say to adjust the tube length until the rods just slightly oscillate to prevent stiction. My Motion Pro instructions say to adjust tube length until pulsing stops. My Motion Pro is virtually rock stable, Morgan oscillates. Morgan says: "There will always be a small amount of fluctuation and this is necessary for the gauges to work properly." If you need absolute vacuum accuracy use a mechanics gauge with an inline restrictor. Use a solid wood dowel or plastic rod on a dill press with a vice. Start with a hole around #79 .0145". The restrictor will serve to average the readings. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
How do you precisely measure engine vacuum?
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