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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine teardown after 90k miles
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<blockquote data-quote="mcatrophy" data-source="post: 1352113" data-attributes="member: 3187"><p>I think it would be reasonable to assume pressure proportional to rpm (all other things being equal), so 4.4 psi at 1050 rpm would need over 16000 rpm to reach 70-odd psi. So, maybe it's right that under normal operation more revs does give more pressure, it's only when cold that the pressure release valve operates. We can probably presume that the oil temperature doesn't rise significantly with sustained high rpm because it's cooled by the water coolant.</p><p>Yes, I was wrong in my doubt of Geezer's statement. Nothing new there, my wife is always telling me I'm wrong. Anyway, my apologies.</p><p></p><p>Of course, the actual pressure within the engine bearings is much higher than the pump pressure, all the pump is really doing is feeding the oil in the right places, overcoming "leakage". Also the engine relies on the oil for cooling all the rubbing bits as well as reducing friction.</p><p></p><p>From <a href="https://en.m.wikipedia.org/wiki/Oil_pump_(internal_combustion_engine)" target="_blank">Wikipedia</a>:</p></blockquote><p></p>
[QUOTE="mcatrophy, post: 1352113, member: 3187"] I think it would be reasonable to assume pressure proportional to rpm (all other things being equal), so 4.4 psi at 1050 rpm would need over 16000 rpm to reach 70-odd psi. So, maybe it's right that under normal operation more revs does give more pressure, it's only when cold that the pressure release valve operates. We can probably presume that the oil temperature doesn't rise significantly with sustained high rpm because it's cooled by the water coolant. Yes, I was wrong in my doubt of Geezer's statement. Nothing new there, my wife is always telling me I'm wrong. Anyway, my apologies. Of course, the actual pressure within the engine bearings is much higher than the pump pressure, all the pump is really doing is feeding the oil in the right places, overcoming "leakage". Also the engine relies on the oil for cooling all the rubbing bits as well as reducing friction. From [URL="https://en.m.wikipedia.org/wiki/Oil_pump_(internal_combustion_engine)"]Wikipedia[/URL]: [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine teardown after 90k miles
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