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|5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)|
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| Originally posted by billB@Sep 19 2004, 01:35 PM |
1. The Intake ducts loop around to just inside the front bumper and terminates. At first “innocent” look I assumed the 5 series is getting FRESH COLD AIR from the large opening under the bumper. That is where the water got sucked into the engine. And yes you are absolutely right BMW is not a boat. Just bear with me!
2. The intake ducts goes toward the lower center large grille opening – Again “innocent” look assumes fresh air away from the hot air of the engine. Yes it is one smart engineering move. Yes for now. it makes perfect sense.
3. Following the ducts they are baffled away from the incoming air. Oops! Why? I thought the air ducts took this long journey of routing ONLY and ONLY to get FRESH COLD AIR!!!!!
==> This is because of "women" in my opinion. The baffles are there to prevent the engine from recieving "too much air" and creating a decent sounding exhaust tone, that some people (ex. women) do not like. I have baffles in my airbox as well, guess what, they got the pliars.
4. Hypothesis NOT a theory YET/thinking loud with you ONLY:
A. If I remove the side baffles the intake would allow lots I mean lots of cool air into the engine compartment (think Temp gauge for this one), and will shoot straight fresh air to the intakes (think M5 design/think more power/think more hp). Isn’t that what the M5 does?
Its what the m5 does, and what my car does without the baffles.
B. Implications: Temp gauges on the 5 series in cold/hot weather love to live in that middle position. Yes in winter a notch under but not so often/summer a notch over. You are not sure but May be? Well for now we are assuming perfect cooling system/conditions. Yes my auxiliary kicks in when temp gets hot/when Ac is no. Perfecto.
Now Due to the complicated nature of this topic and its length we will try to post it in a series of posts.
To conclude post 1 on the intake:
It seems to me BMW engineers were very conscious to control the airflow through the 5 series intakes. They were thinking along the lines of much LOWER volume of air the engine draws and at the same time giving the air in the ducts more time to heat up ( see above/think routing/baffling away from fresh air) , and providing less cooling for the engine compartment. Wow less cooling? I know. Billb sounds crazy and lost it after the flood……. but be patient and don’t jump to your guns/hold your horses till you read round 2 of this post. Yes round 2 will be coming soon with A SOLID PROOF!!!
Again, the baffles are to keep the exhaust note at an acceptable level. This is an interesting theory however, one never knows what those engineers will think of next.
Hint for the proof /post 2? The less air BMW engineers use to cool the 5 series, the better because air going through the car invites more drag than air being baffled.
(Think diversion and go aerodynamics here see you at post 2)
| Originally posted by billB@Sep 19 2004, 05:09 PM |
1. When you looked under the hood you could NOT possibly see the routing of the duct. It is hidden by the light assembly. and
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