The Lubrication system, oils well that ends well. - IMBOC
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post #1 of 9 (permalink) Old 03-12-2019, 08:25 PM Thread Starter
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Talking The Lubrication system, oils well that ends well.

Modern lubrication systems are a lot more complex than they were even 20 years ago. The lubrication system has many jobs; it reduces friction, it cools engine parts, it clean parts, provides hydraulic control of the camshaft timing, and removes and stores dirt and contaminants created while the engine is operating.
I will save how variable cam timing works for another thread. Ford was instrumental in developing VCT.
So how does the lubrication system operate? When the engine is started the oil pump creates suction and draws oil from the oil pan and pressurizes it for it's journey throughout the engine. The 19 Bullitt uses a "gerotor" pump which is hybrid gear/rotor, one inside the other, and the pressure is controlled by a pressure relief valve within the pump to control the maximum psi.
The oil then travels to the oil filter, where much of the oil is filtered, some bypassing the filter, and then heads to the crankshaft where it provides lubrication for the main and connecting rod bearings. These friction type bearings are literally running on a film of oil about .0015 of an inch. If the bearings go dry for some reason, there will soon be a window in the engine block. Oil slinging off the crankshaft lubricates the cylinder walls and may be augmented by piston squirters. (Not sure if Gen 3 has piston squirters?)
Meanwhile oil is travelling through the oil galleries up to the cylinder heads to lube the cams, rockers, timing chains and other valve and cam components. The oil returns to the oil pan, largely by gravity, where it joins the oil in the oil pan to continue the lubrication cycle.
When you start your cold engine it may take a few seconds for oil to circulate to all points necessary. In fact if it's really cold it could take as long as 30 seconds or more for oil to reach the top of the engine and all it's parts. It is very important to let your Bullit run for a little while before you move off. It's also very very important to let the oil warm up before you pull high RPM's. Over revving the engine when cold can overwhelm the oil pump and cause damage and may cause oil to by pass the filter. Some GT 350's have shattered the oil pumps.
So, warm it up before you giddy up. Next time, variable valve timing and the new cam torque actuation system in your new Bullit.


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post #2 of 9 (permalink) Old 03-12-2019, 10:14 PM
 
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Good advice, thank you. 🙂
It’s true, the oil has a lot more places to go than it used to.
On cold starts I let mine idle until it calms down from 1200 rpm to 900 rpm. Usually takes from 10 to 30 seconds depending on the weather. 😉
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post #3 of 9 (permalink) Old 03-13-2019, 10:13 AM Thread Starter
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post #4 of 9 (permalink) Old 03-13-2019, 10:28 AM

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Another great post. Thanks Pat.

Just to add a little more to the warm up fact. When you first start the car, cold. You put the car in neutral and let the clutch out to warm up. When you do this, the transmission main drive is also spinning allowing oil to circulate in the transmission. So while warming up the engine and getting the oil circulating, the same thing is happening in the transmission. So immediately driving on a cold engine is also hard on the transmission.

Meanwhile we have not discussed what happens in the rear differential when it is cold.

Moral of the story, allow the engine to warm up a little (does not take a long time just a little) and drive slowly until all system has its lubricant flowing. The colder it is, the longer this takes.
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post #5 of 9 (permalink) Old 03-13-2019, 12:00 PM
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Thanks, Pat!
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post #6 of 9 (permalink) Old 03-14-2019, 09:44 PM
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Just getting accustomed to the car but have noticed some unusual oil pressure activity, at least it seems unusual to me. When cold and at low RPM and light throttle I've seen 80+ PSI pressure and then suddenly with no change in throttle or RPM it drops to 40ish. Some electronic control possibly?

Also at idle and warmed up pressure is under 20 PSI. Seems low.

What are others experiencing?
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post #7 of 9 (permalink) Old 03-14-2019, 10:01 PM
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Yes, this is normal operation.
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post #8 of 9 (permalink) Old 03-14-2019, 10:14 PM Thread Starter
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When it hits say 80 psi the high pressure by pass spring will open and bleed off the excess pressure. Rule of thumb engines require ~10 psi per 1000 RPM. Sounds normal so far.
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post #9 of 9 (permalink) Old 03-15-2019, 10:51 AM

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The 08/09 only included a "glorified" idiot light disguised as an oil gauge. At least the '19 has a real one. The factories started using the "glorified idiot light" because of the number of people who demanded their car be fixed because the Oil Pressure fluctuated so much, which is normal. A lot of people insisted the oil pressure should be steady at all times. For them the Idiot Light was perfect because they didn't understand oil pressure.

What #94 reports is as expected. There is really that much of a swing in oil pressures in a properly operating engine.
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