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Old 01-31-2010, 03:21 PM   #1
sdowney717
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Default fuel mileage and fuel injector disconnection

sort of like running on 3 cylinders
yes you have pumping losses.
perhaps rougher running sort of like a miss, but no fuel is getting used for that cylinder.
I was wondering if fuel usage would drop. And this might be a better idea for highway usage.

Cylinder deactivation is now called Active Fuel Management.
http://en.wikipedia.org/wiki/Active_Fuel_Management

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Old 01-31-2010, 03:49 PM   #2
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Default Re: fuel mileage and fuel injector disconnection

Engines that have it as a feature are progrmmed for it.
Your car would see it as a problem. Misfire codes. Lean codes. The rest of the cylinders would possiblely richen up to get the exhaust up the the wanted air fuel mix that the O2 sensors expect to see.

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Old 01-31-2010, 07:19 PM   #3
jss21382
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Default Re: fuel mileage and fuel injector disconnection

Yeah, The additional oxygen in the exhaust because of the pumping that's still occurring will throw the readings far to the lean side, so you'd lose any gains with the attempted correction for the lean condition.

The only way you'd be able to get it to work correctly would be to figure out how to deactivate the cylinder. Both the Honda and Chrysler systems deactivate the valve train for the deactivated cylinders, effectively making the cylinder into an air spring, which largely negates the pumping losses as well as eliminating the exhaust gas oxygen issue.

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Old 01-31-2010, 07:52 PM   #4
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Default Re: fuel mileage and fuel injector disconnection

We need to replace camshafts with solenoids (not on Saturns, but on engines in general). Then instead of the timing chain/belt breaking and smashing valves against pistons, a solenoid would fail closed (due to spring pressure), the computer would throw a code to indicate which solenoid failed, and you'd simply pop off the valve cover to swap out a solenoid. And you could buy more expensive solenoids that would open the valves farther and faster for increased performance, instead of rebuilding your mechanical valve train.

Not to mention it would probably use less energy to operate than our chain-driven valve-trains, and the car would most likely still be temporarily drivable with a stuck solenoid, unlike a broken belt/chain.

Then when little power is needed, the engine could shut off 3/4 of it's cylinders by killing the injector and spark and closing the exhaust valve.

But it's only 2010, it's not like we can put a man on the moon or 1,000 songs on a tiny little card or browse the internet from some sort of wirelessly-connected hand-held device. And gas is dirt cheap, so it's not like we need to make engines more efficient.

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Old 02-01-2010, 12:06 PM   #5
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Default Re: fuel mileage and fuel injector disconnection

The technology has been here for a long long time. It's just a matter of production cost and reliability. Timing chains, for the most part last for a reasonable amount of time, provided you change the oil and design the system properly(don't look at the ecotech for that...) Camshafts, buckets(or lifter and rocker), and chains are very inexpensive to manufacture, compared to using 16 solenoids on your 4 cyl, 24 on the 6, and 32 on an 8 cylinder. Not to mention you've just added 16-32 individual electrical parts to fail in an engine.

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