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Old 07-02-2009, 04:40 PM   #11
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Originally Posted by Jetta90GL View Post
Another thought would be that if you don't keep the valves closed on the unused cylinders, the O2 sensors will read more oxygen than normal. Causing more fuel to be dumped in.
You make a good point, I guess a very simple thing he could do is get a cam that doesn't actuate the valves on the cylinders he doesn't want to run, it wouldn't require a head rebuild and wouldn't be too difficult though he would have to pony up some dough.
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Old 07-02-2009, 06:32 PM   #12
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Unplug two injectors, the oxygen sensor reads lean and increases the fuel to the working injectors. The excess fuel is then pulled into the cylinders with dead injectors and the engine still runs on 4 cylinders but not very good.

Seen it on a Maxima with one dead injector, idled fine, slightly rough on acceleration.

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gary
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Old 07-02-2009, 07:07 PM   #13
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I know, let's beat a dead horse!

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Old 07-02-2009, 07:19 PM   #14
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Nobody has had any real success with cylinder deactivation??? Why?
I don't necessarily know why, I just know that I've read a few experiments and they all gave up when it didn't work for them and was too difficult. If you can make it work, that's great and I hope you'll document everything well.
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Old 07-02-2009, 09:16 PM   #15
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I don't necessarily know why, I just know that I've read a few experiments and they all gave up when it didn't work for them and was too difficult. If you can make it work, that's great and I hope you'll document everything well.
Can you cite said experiments please?
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Old 07-02-2009, 09:22 PM   #16
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Actually it'd be easier on a FI car because you could disconnect the electrical to the fuel injector and spark plugs, no spark and no fuel means you can leave the valves alone, unless you want to reduce the losses incurred from having them open, close and compress for nothing.
Actually this probably would make the engine stumble a bit, but most importantly disconnecting fuel injectors will set a trouble code in the computer, and force it to run in open loop.
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Old 07-02-2009, 10:24 PM   #17
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Actually this probably would make the engine stumble a bit, but most importantly disconnecting fuel injectors will set a trouble code in the computer, and force it to run in open loop.
Well that's what the op did. The problem with a carbureted engine is you'll get an accumulation of fuel build up behind the valves or on what ever you use to plug up the hole in the intake, but with a fuel injected car, you can simply not inject fuel into those holes at all, resulting in no fuel build up. This is one of the reasons why on the Vtec-E engines, under lower load low speed operation the second valve doesn't stay closed completely but opens a little, just enough so that fuel doesn't pool up.
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Old 07-02-2009, 11:25 PM   #18
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Now that you mention it, I do remember them saying you had to block off half the carb... Maybe I'll look for that original article I read tomorrow morning. I remember it was published in Mother Earth News...
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Old 07-03-2009, 04:34 AM   #19
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Can you cite said experiments please?
Experiments:
http://www.gassavers.org/showthread.php?t=7132
http://www.gassavers.org/showthread.php?t=243
http://www.gassavers.org/showthread.php?t=6137

Discussions by people considering doing the experiment:
http://www.gassavers.org/showthread.php?t=8826
http://www.gassavers.org/showthread.php?t=10872
http://www.gassavers.org/showthread.php?t=6033
http://www.gassavers.org/showthread.php?t=6218
http://www.gassavers.org/showthread.php?t=410
http://www.gassavers.org/showthread.php?t=48
http://www.gassavers.org/showthread.php?t=4964
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Old 07-03-2009, 06:53 AM   #20
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http://www.motherearthnews.com/Green...onversion.aspx
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