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07-23-2007 09:59 PM #1
08-04-2007 11:50 PM #2
I read about it in the BMWUSA.com website. I think both 128i and 135i are going to be equip with it. I think the 1 series is the first model equip with this new stuff. They call it "EfficientDynamics". I call it BS. I've read about many 335i's over heating and BMW thinks they can run a water pump intermittently, as needed. The only place that a water pump doesn't need to be constantly running is maybe Alaska.
09-03-2007 11:13 AM #3
09-22-2007 12:28 AM #4
Electric water pump intro in '06 models
The electric water pump has several advantages over the old fashioned pumps.
1. Power. Since the new pump is not run by a belt, power and efficiency are gained.
2. Emmissions. The engine will heat faster and lower cold start emmissions to make the feds happy.
3. Key off cooling. The water pump will run w/o the key on to coolr the engine evenly after driving. This will help engine life by eliminating the hot spots in the engine that are there after driving. It also cools the turbos after driving and eliminated having to idle the engine after driving for turbo spindown and cooling.
4. Electronic monitoring. The water pump is monitored by the engine control unit. If a problem is detected it can be caught before failure, possibly saving an engine or breakdown on the side of the road. Seizing bearings would be caught earlier because the voltage required to run the pump would increase to obtain the same cooling output.
If a pump fails, it fails. Mechanical pumps fail all the time and will leave you on the side of the road. Usually there is a noise that some customers do not notice before the pump fails. A check engine light will perhaps prompt a service visit and possibly avoid a breakdown.
Same thing with the clutched alternators. They also came out in the '06 my and have had very little problems. They are used when needed and are also electrically monitored. Nothing is perfect but if a problem is identified and resolved w/o a breakdown then things might work out better.
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