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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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not sure i put it together in 2017
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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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DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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Cracked pickup tube ? Dent in the oil pan ? I never had a problem drag racing my AMX but it had a Milodon pan and pickup on it. I would change out the pan and add some capacity along with looking everything over. 0 oil pressure at 6k is not good on bearings.
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Online Points: 3553 |
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Oil pressure is overrated. Just add til it starts leaking out and let it splash oil the bearings.
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Mopar_guy
Supporter of TheAMCForum Joined: Jun/07/2009 Location: Ohio Status: Offline Points: 4823 |
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"Hemilina" My 1973, 5.7 Hemi swapped Javelin |
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Gench
AMC Apprentice Joined: Oct/09/2021 Location: Boulder CO ish Status: Offline Points: 182 |
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Shift at 5k
Kidding aside, I don’t know what your problem is, lots of things to check listed. Heavy oil and drain back is one of interest to me… specifically drain back itself from the heads. Liquids typically need a vent to drain fast when contained. The none vented valve covers, assuming none vented, seem suspect. That said, simply venting your valve covers ruins PCV function as it won’t draw, or my takeaway anyway. Solution? - I’m not sure what my success will be but I’m going to do the following. 1. Add hose connections between valve cover and oil fill tube. Specifically I would add a hose barb to each valve cover and two on the fill pipe itself. This would provide filtered vent air to each cover. Plan to add in center of cover, and as high as possible. 2. I’m adding an air/oil separator kit for the PCV system that I’ll drain direct to the fuel pump block off plate. 3. Add drain lines to lower front valve cover and join to drain into fuel pump block off plate. My plan is to do step 1 and 2 to start, add 3 if drain back seems to be an issue. Not sure how they are expected to drain once they fill without a top vent?
Edited by Gench - Jul/03/2022 at 4:57pm |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
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Thick oil by definition resists fast motion, and every part in the engine is moving fast at 6000 rpm. A thinner oil would be smart, I think.
What about oil pump cavitation? It's just an idea that came to my mind. Spinning things like gears really fast in a fluid can make that fluid cavitate. It can also heat that fluid up rather quickly. Speaking of which, you would probably have lower oil and bearing temperatures with a thinner oil. And you'll probably go a little faster.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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Knowing if you have a proper gap, pickup to pan, is something you need to know. Too tight is not good and it could account for what you are experiencing
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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matty 401
AMC Addicted Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1727 |
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i switched to 10w30 racing oil seamed to help a little bit
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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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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Often the reason is... The oil is in the valve coversand the rear of the lifter gallery. The oil drains back down as demand decreases. |
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Gremlin Dreams
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i6cj7
AMC Apprentice Joined: Feb/20/2018 Location: virginia Status: Offline Points: 138 |
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Could the oil fill tube be used for a turbo drain? Ceramic ball bearing, so it uses very little oil.
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