12-12-2023, 09:47 AM | #57 | ||
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12-12-2023, 05:12 PM | #58 | |
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Food for thought, as if you want to look at the data, you should consider ALL the data, rather than just a few. |
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12-13-2023, 01:59 AM | #59 |
extra what?
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Care to spoon feed me a bit?
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12-13-2023, 02:17 AM | #60 |
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NASCAR teams want power. FA2x guys want to make sure the engines don't blow up.
That hotter/thinner oil nets them a few more ponies; lubrication isn't the issue for them. On the other hand, FA's aren't exactly looking for a few more ponies in an engine that's being replaced regularly. |
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12-13-2023, 06:28 AM | #61 | |
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Anyway, yeah, *flow* is the most important thing, and a lack of it due to RTV blockages and loss of pickup during cornering have been identified as issues. I wouldn't think running oil temps of 275F indicated, 255F sump should hurt or reduce "flow". |
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12-13-2023, 09:00 AM | #62 | |
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Say at 5000 rpm, what is the difference in flow of oil at 200*f and 60psi versus flow at 260*f at 30psi? |
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12-13-2023, 09:42 AM | #63 | |
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12-13-2023, 09:50 AM | #64 |
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okay thanks
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12-13-2023, 10:23 AM | #65 | |
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But anyway, as always, if you are worried about low oil pressure at higher temps, easy enough to go up in viscosity. From what I've seen, people are not seeing oil pressure as low 30psi even running 0w20 at 270F indicated. |
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12-13-2023, 11:44 AM | #66 | |
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The auto world has a weird way describing flow with the resistance to flow. Think forced induction. "I'm running 20psi." No one says "It's pushing X g/sec of airflow." 20PSI is an insane amount of airflow in my Viper. It's nothing in my NB Miata that is running a restrictor plate. It tells us absolutely nothing unless they are nearly identical engines. Then again, the diameter of a tire is expressed as a function of half the width of the mm plus the wheel size in inches. I really cant even think of a dumber way to do it. Why is not just width/height/wheel size (like old school trucks) in the same units. 750/245/17. Then you'd have standardized heights instead of 748.27mm. But I digress...
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12-13-2023, 08:41 PM | #67 | |
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Is there a way that Bernoulli's principles are at work here? My basic understanding is that the higher flow rate of a fluid, the lower the pressure. I would try the math but I don't have the right crayons. |
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12-15-2023, 09:21 AM | #68 | |
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12-15-2023, 10:31 AM | #69 | |
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I understand that with higher temperatures there is a decrease in pressure due to the decrease in viscosity. Is there a corresponding increase in flow? And, I'd still like to understand the drop in pressure from 4k to 7k rpm with higher temperatures. |
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12-15-2023, 10:45 AM | #70 | |
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BTW: with all this said, PRESSURE and not mass flow is important for oil because its oil pressure that keeps the rod bearings from rubbing on the crank. Flow and pressure are obviously related (Pressure = flow * resistance), but you can pump as much oil as you want- if there isn't pressure (force) to push back on the rod bearings, you'll have contact. Oil doesn't so much "lubricate" rod bearings as it does keep the separate. It lubricates contact surfaces like rings/walls, camshaft lobes, etc. Using fluids is a buffer, the same but different, is used in after burners. They burn at 4000 degrees. You know what doesn't burn/melt at 4000 degrees? absolutely nothing useful. But air still has to be ducted (and in the case of the F22, trust vectored). Imagine 4000 degree exhaust gas temps. What the hell do you do? They push a layer of cold bypass air through thin little holes (that some super smart dude figured out where to put and how many to put in) so they get a near perfect laminar sublayer of air between the exhaust flap and the hot air. Effectively, it creates a buffer between the hot air and the exhaust flap. You can see the little holes and slits in the hot side of the convergent/divergent flaps https://qph.cf2.quoracdn.net/main-qi...2dcc0148b17255
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2013 Viper GTS : Tractive Coilovers, ACR sway bars, aero, carbon, exhaust, etc. 1992 NA Spec Miata: 1.6 + 1999 NB Spec Miata: 1.8 w/ all the goodies. 2018 GLE 63 AMG: +800hp whistling AWD TT V8 grocery getter 2016 GX460: IDK. Too reliable to sell. Too boring to use. |
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