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SVTPerformance's Chain of Restaurants
Road Side Pub
How does Cylinder Deactivation actually save fuel?
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<blockquote data-quote="James Snover" data-source="post: 15766880" data-attributes="member: 67454"><p>Not wrong at all, and a very good point! The other part of the equation, though, is that part-throttle is a net pumping loss. The higher the vacuum is a direct indication of how hard the engine is working to get air. The engine has to work harder to get a smaller breath, so what you gain in reduction of volume of air to which to add fuel, you lose in the effort it took to get it.</p><p></p><p>That is the other nifty trick of the Atkins/Miller cycles that absolutely demands variable timing to achieve: when you control the amount of air the cylinders get with the valve timing, you can leave the throttle wide open and eliminate those pumping losses.</p></blockquote><p></p>
[QUOTE="James Snover, post: 15766880, member: 67454"] Not wrong at all, and a very good point! The other part of the equation, though, is that part-throttle is a net pumping loss. The higher the vacuum is a direct indication of how hard the engine is working to get air. The engine has to work harder to get a smaller breath, so what you gain in reduction of volume of air to which to add fuel, you lose in the effort it took to get it. That is the other nifty trick of the Atkins/Miller cycles that absolutely demands variable timing to achieve: when you control the amount of air the cylinders get with the valve timing, you can leave the throttle wide open and eliminate those pumping losses. [/QUOTE]
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How does Cylinder Deactivation actually save fuel?
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