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new problem losing oil pressure upper rpm's |
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matty 401
AMC Addicted Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1727 |
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72 matador 401 the beast
79 concord 2 door 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4.0 5 speed |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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If changing grades, try a 10W40 race oil next. This should provide a little more top end RPM pressure and the same low RPM pressure.
Don't know why, but seen more break a rod using 20W50 at the end of a track run or on deceleration after tire warm up, then using any other lighter weight oil. Just PO, heavy weight oil and hard deceleration seems to be a rods week point. The ultimate in oil bypass spring adjustment:
Edited by Trader - Aug/25/2022 at 2:28pm |
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79 SPirit
AMC Apprentice Joined: Aug/16/2022 Location: Southeast Status: Offline Points: 59 |
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If you have an old relief spring probably just replace it with the red spring might just do it. Small washers can be used for shims to adjust pressure
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Regamble1969
AMC Apprentice Joined: Dec/01/2021 Location: Boise Idaho Status: Offline Points: 204 |
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This strikes me as a pump cavitation problem. Gear type pumps and front mounted pumps both suffer from this more than in-pan style pumps or gerotor pumps. Lots of factors in a cavitation problem, but there is a fantastic article here that might help. There are a lot of passages our AMC oil travels through, and the remotely located pickup can make it problematic.
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matty 401
AMC Addicted Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1727 |
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motor pulled freshen up rings all new bearings new pick up and pan turns 6000 at 80 pounds of oil pressure and holds when going into second I am happy
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72 matador 401 the beast
79 concord 2 door 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4.0 5 speed |
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