The real affect of cylinder deactivation - Mercedes Benz SLK Forum
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#1 Old 04-09-2019
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Talking The real affect of cylinder deactivation

https://www.sciencedirect.com/scienc...01679X17306035

Great read. I found it a real nailbiter.
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#2 Old 04-09-2019
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TLDR


Abstract

Thermo-mixed-hydrodynamics of compression rings and big-end bearings are presented. Frictional losses under normal engine operating conditions for a gasoline engine and those with cylinder deactivation (CDA) are predicted. With CDA, the combustion chamber pressure increases in the active cylinders, whilst some residual pressure remains in the deactivated ones. For the former, the increased in-cylinder temperatures reduce viscous friction, whilst reducing the load carrying capacity, promoting increased boundary interactions. In deactivated cylinders, lower contact temperatures yield increased viscous friction. Overall, a 5% improvement in expended fuel is expected with the application of CDA. However, 10% of these gains are expended due to increased friction. The study demonstrates the need to consider total system effects when introducing new technologies such as CDA.


I knew some of those words.
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#3 Old 04-09-2019
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Read every word. Do they do that on an SLK350?
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#4 Old 04-09-2019
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The only SLK with cylinder deactivation is the R172 AMG 55.
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#5 Old 04-09-2019
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Jeez, from what I read my Jeep should be able to distill its own lubricants...or levitate.
More beer.
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