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Old 10-15-2001, 22:17   #1 (permalink)
 
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Cylinder de-activation

Does anyone know if Ford currently employ this in any of their cars, anywhere in the world?
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Old 10-15-2001, 22:21   #2 (permalink)
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Maybe in the Vanquish but other than that I don't think so mate :confused:
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Old 10-15-2001, 22:50   #3 (permalink)
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I wouldnt think so mate but I'll ask my mate, he should know.
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Old 10-15-2001, 22:53   #4 (permalink)
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Never knew such a thing existed!:eek: :rolleyes:
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Old 10-15-2001, 22:58   #5 (permalink)
 
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I have been talking to Dk about it on ICQ and he reminded me that the inline six has a limp home mode that does deactive cylinders.

once again in wheels they claim GM are having a bit of a fight amoungst themselves. Holden want this in their V8s next year as a fuel saving measure but timing issues with Gen 4 and the switich to local production is causing some problems.
Seems like this feature is more important then gaining KWs.

If my memory serves me right, I think the Holden system switches back to 4 cylinders for driving around town and the like and when you put your foot down the other four kick back into life!
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Old 10-15-2001, 23:22   #6 (permalink)
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Cylinder Deactivation

On the AU Falcon, cylinder deactivation is only used in fail safe cooling and during traction control events.

In fail safe cooling, if there is a catastrophic cooling system failure and all the coolant is lost, and the head temperature rises above certain levels (the AU Falcon has a head temp sensor rather than a coolant sensor), then the PCM cuts out cylinders to reduce power and allow some degree of aircooling of the cylinders. The cut out works in a round-robin so that it isn't always the same cylinder being deactivated. 3, 4 or 5 cylinders are deactivated depending on how hot things get. If things get too hot all 6 cylinders are deactivated and you come to a stop (well until things cool down again).

During traction control events, the traction control computer requests a reduction in torque from the engine, and depending on how much reduction is requested, the PCM retards spark and deactivates cylinders to comply.

The Falcon does not deactivate cylinders during cruise or low throttle or the like.

Hope this helps out.

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Old 10-15-2001, 23:25   #7 (permalink)
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My AU2 XR8 has had intermittent cylinder deactivation a few times now - does that count?
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Old 10-15-2001, 23:27   #8 (permalink)
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Quote:
Originally posted by Aussie Pete
My AU2 XR8 has had intermittent cylinder deactivation a few times now - does that count?
Pete - I was waiting for some comments from you on Aussie Falcon's car, in regards to this thread... :D
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Old 10-15-2001, 23:29   #9 (permalink)
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Quote:
Originally posted by el2xr8


Pete - I was waiting for some comments from you on Aussie Falcon's car, in regards to this thread... :D
Nah - I gave him enough during the Trip. I think he got the idea... :D
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Old 10-15-2001, 23:42   #10 (permalink)
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Im not mechanical bob, so im not to knowlegebale in very technical things but if the cylinder deactivates what happens to the firing order? does the ecu stop the spark to one of the cylinders?
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