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Question for E90Fleet
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11-04-2005, 07:46 AM | #1 |
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Question for E90Fleet
My latest issue of Roundal had a piece about a Dinan Z4. One of the mods had to do with the airbox. Dinan stated their airbox actually removes as much H20 (90%) as the OEM version but unlike the OEM airbox, theirs actually has ram air characteristics. The article said the BMW stock airbox has a slight vacum(sp?).
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11-04-2005, 09:03 AM | #2 |
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Most non-turbo/supercharged engine intakes run under a slight vacume
Think of it : The piston goes down in the cylinder with the intake valve open, this downwards movement causes a bit of a vacume because it has to draw the air in past the throttle and valves. You can measure this vacume in the intake, most piston aircraft have a instrument showing "manifold pressure" At small throttle openings there is a pressure well below atmosperic pressure ( vacume ) At wide open throttle you just about get atmosperic pressure The BMW intake gives this pressure, now the Dinan one must somehow allow air to be rammed into the intake creating a pressure above atmospheric at wide open throttle. Turbos and superchargers work the similarly. They use a fan to push more air into the intake, making the pressure in the intake greater that atmospheric pressure |
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11-04-2005, 09:48 AM | #4 | |
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11-04-2005, 07:17 PM | #8 |
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11-04-2005, 09:31 PM | #9 |
COLTS 4 LIFE!!!
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i wonder how big his head is right now....YOU DA MAN!!!
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11-04-2005, 09:36 PM | #10 |
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11-04-2005, 10:35 PM | #11 | |
BMW, can I have some LSD please?
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