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Mandatory oil system mods |
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JolleyGreenSST
AMC Apprentice Joined: Jul/12/2018 Location: High Desert, CA Status: Offline Points: 239 |
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Sounds right to me and I trust hands on experience over theory any day. So my question is would you think its better to run a higher capacity pan or is it fine to just run six quarts of oil in the stock pan?
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"God is good all the time and all the time God is good!"
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wheelz
AMC Apprentice Joined: Jan/29/2019 Location: NJ Status: Offline Points: 101 |
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T/A performance. Its a Buick part and the bolt is a different size so I transfer the adjuster to an AMC bolt by drilling the same size hole and using an AMC spring
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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Trader has a few things correct -- aeration/frothing of the oil is bad, the extra quart allows more "spirited" driving, and the stock pan with stock oil level is good for everyday driving. 69 ambassador 390 has the reasons the extra quart works correct, and is also correct that even on startup with all oil drained in the pan six quarts won't contact the crank, at least with the car near level. I suppose it might if on much of an incline, but even then only for a second or two until the pump sucks it up into the engine -- by the time the engine fires it's sucked up half the oil. For regular racing a high capacity pan may make sense. For the occasional trip down the strip or autocrossing the extra quart has proven to be more than adequate. I'd only invest in a high capacity pan with a "floating" pickup only on a high dollar race engine (or any high dollar build). Well, $5K is "high dollar" to me, but what I mean is those $10K+ engine builds. $5K gets you what, a mild but well built engine -- at least if you have a good shop build it. Plenty people on here could build a healthy street/strip engine for $5K or less. Really depends on what you start with and just how "healthy" you want it. And how good/licky at parts scrounging you are. I think I could build one (assuming I started with an engine in decent condition) with all new parts for $5K easy enough.
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Frank Swygert
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73hornut
AMC Addicted Joined: Jul/03/2007 Location: Southern Oregon Status: Offline Points: 3130 |
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71 Javelin
74 Gremlin 79 Spirit AMX Rogue Valley Rumblers Like Us on FB https://www.facebook.com/groups/1602825606650796 |
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Red Devil
AMC Addicted Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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... if the engine has sucked up half the oil shortly after it's fired, not surprising we have never ending oiling issue threads :) Also, remember that the engine is angled down approx. 3 degrees in the chassis, so when doing the "extra quart" test, make sure the pan is at a 3 degree down angle to simulate start up. Then if half the oil is sucked out of the pan shortly after start up, lower the level by half then angle the pan 30 - 45 degrees forward, rearward and side-to-side to simulate braking / acceleration / cornering oil levels (45 degrees being 1-g load) ... and check if the pickup is generously submerged in oil under all conditions. Then consider your application and whether the stock pan with 5 quarts or 6 quarts is enough. Hope this helps, RD.
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Just a little light reading:
I find figure 1-5 and connecting rod lubrication interesting as it seems to me a plausible cause for #6 failures and typical AMC failures towards the rear due to "bubbles forming and blocking oil flow. |
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Shawn_Watson
AMC Apprentice Joined: Dec/05/2018 Location: Carlsbad, NM Status: Offline Points: 117 |
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You're definitely going to have aeration issues if the "fix" for poor drainback is more oil, at least in my opinion.
Shawn |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Typically on most engines, 1 to 2 quarts of oil are in motion above the oil pan. Adding one quart would likely be fine if on an AMC this still keeps the crankshaft from aggressively aerating the oil.
As RD pointed out the aggressive driving is another matter. On deceleration the "police pan", you would think, without the "standard pan" baffle, move so much oil to the front of the engine that you would aerated heavily but also expose the oil pickup to air. I'm not convinced the "police pan" is a desirable thing to have. Just reading on the g forces, a stock 1970 Go Pack AMC by the numbers (time/distance) would pull 0.4g on acceleration and with disk brakes was best in class and pull 0.6g braking. Not bad for a 1970 vehicle, as a BMW M3 today is best in class pulling 1g (32 ft/s-sq) braking.
Edited by Trader - Feb/08/2019 at 11:02am |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7949 |
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wheelz
AMC Apprentice Joined: Jan/29/2019 Location: NJ Status: Offline Points: 101 |
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Adding a remote oil filter will also add capacity to the system. I like to run the Bulltear adapter and braided lines to the filter adapter. Along with my 8 qt Milodon I have almost 10 quarts but I only put in 9 so I have 7 in the pan
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