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10-09-2018, 11:00 AM | #68 | |
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10-09-2018, 11:10 AM | #69 | |
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(my dad bought a set of these piles of tripe - I destroyed them with GNR )
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10-09-2018, 11:44 AM | #70 | |
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But the information/diagram is sourced from an internal BMW technical document, for BMW employees. You're making the comparison to rod bearings; are you implying that BMW designed the opening as an outlet and are lying about it being an inlet? Whether it is an outlet or inlet, the opening is functional, so logically, BMW really have nothing to gain from perpetrating a lie about its function because it's functional either way you look at it. Design flaws & defects inevitably occur (and no manufacturer is immune to this), but to dismiss a manufacturer's entire R&D process because of it is quite unreasonable.
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10-09-2018, 12:20 PM | #71 | |
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This, in my mind, raises the the question that if an air stream is moving at a relative velocity of 100KPH across a ~flat opening parallel to the flow vector, what force is being applied to the air to cause it to change direction by more than 90° in order to flow into the engine? I would like to see the free body diagram that explains the validity of BMW's literature. Here is an example of venting located on the hood surface that is used for exactly the opposite reason that BMW is stating on the M3. At the end of the day, it really does not matter much as the M3 is fun as hell, regardless how the air flows! Cheers,
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10-09-2018, 12:24 PM | #72 |
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It's very simple actually and no "laws of physics" are being undone. To the contrary in fact of course. If you don't have experience analyzing potential flow and boundary layer flow and understand pressure distributions, rising adverse pressure gradient, and the pressure recovery zone starting mid-hood to the windshield base, then randomly guessing what is going on is likely not going to work.
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10-09-2018, 12:37 PM | #73 | ||
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I can see where your argument makes sense and is related to what some others have said in the other pages. But it's still entirely possible when you take account the pressure zones and vacuum of the engine intake, that the air can flow into the vent. Now, whether or not BMW engineers were able to do that to perfect harmony is something we've yet to confirm. But that's what BMW claims to have done. All I am saying is, I understand the skepticism and a lot of good arguments can be made for both inlet & outlet hypotheses, but until someone really tests this out, the most reliable information we have is from the people that designed it themselves. Yes...quite possibly the same people that also designed our bearings. But still, they tend to know what they're doing most of the time Quote:
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10-09-2018, 06:56 PM | #75 |
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Another situation where the hood vent becomes an intake is if both the front intakes are submerged in water, ie during a flood.
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10-09-2018, 07:52 PM | #77 | |
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;-) They weren't exactly built for dynamics. But cool post nonetheless! Been in the audio industry for over 30 years
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10-10-2018, 12:10 PM | #78 |
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