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Driving at redline? Driving at redline?
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Old 06-30-2008, 12:38 PM
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Driving at redline?
What amount of time does your engine see redline? If I hit redline on my 4.4 its less than 5 times a year. I try to make a point of reving the engine occasionally to blow deposits off of the valves, but rarely above 4500 RPM. But unless I work at it my engine never sees more than 3500 RPM. At what RPM does the VANOS advance the valves?
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Old 06-30-2008, 12:44 PM
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I spend more time at redline than I do at idle... I can't even count how many times it is at redlined in a day...
Last edited by swissfrank; 06-30-2008 at 06:59 PM.
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Old 06-30-2008, 02:27 PM
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I probably hit red line more than 5 times during a trip last week.

Not sure about the VANOS question.
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Old 06-30-2008, 06:51 PM
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VANOS switchover is around 4,000 RPM on the 4.4.
Last edited by swissfrank; 06-30-2008 at 06:59 PM.
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Old 06-30-2008, 06:56 PM
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I'm pretty sure VANOS continuously adjusts valve timing. Lift is a fixed.

EDIT: VANOS switches the intake timing at 4,000rpm. All the X5 engines though use Double-VANOS, which is continously variable.
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Old 06-30-2008, 07:00 PM
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VANOS adjusts the timing of the valves; advancing them at increased RPM. Valvetronic adjusts the lift.
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Last edited by Tomaz; 06-30-2008 at 07:09 PM.
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Old 06-30-2008, 07:14 PM
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VANOS and Double-VANOS:

http://www.usautoparts.net/bmw/technology/vanos.htm
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Old 06-30-2008, 07:25 PM
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Quote:
Originally Posted by swissfrank
I spend more time at redline than I do at idle... I can't even count how many times it is at redlined in a day...
OK, I'm impressed. So I have to ask, how is the engine and driveline holding up? How about oil consumption?
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Old 07-01-2008, 01:32 AM
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Quote:
Originally Posted by Tomaz
OK, I'm impressed. So I have to ask, how is the engine and driveline holding up? How about oil consumption?
Engine doesn't burn a drop of oil between my 15,000km oil change intervals. Engine is still quite as it was day one. I recently had to replace the F Clutch piston, but that is a known failure point regardless of my driving style. Other than that when I opened up my tranmission it was still in perfect condition other than the F piston. Friction material had next to zero wear, really impressive at 170,000km.
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Old 07-01-2008, 11:57 AM
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Quote:
Originally Posted by swissfrank
I spend more time at redline than I do at idle... I can't even count how many times it is at redlined in a day...
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