Fuelly Forums - 2+2=4... But If you -2 Then??

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- - 2+2=4... But If you -2 Then?? (https://www.fuelly.com/forums/f9/2-2-4-but-if-you-2-then-11554.html)

imzjustplayin

07-02-2009 03:40 PM

Quote:

Originally Posted by Jetta90GL (Post 137609)

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.

R.I.D.E.

07-02-2009 05:32 PM

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.

regards
gary

theclencher

07-02-2009 06:07 PM

I know, let's beat a dead horse!

https://www.fuelly.com/attachments/fo...df74ffa724.gif

theholycow

07-02-2009 06:19 PM

Quote:

Originally Posted by Diabloflash (Post 137608)

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.

imzjustplayin

07-02-2009 08:16 PM

Quote:

Originally Posted by theholycow (Post 137619)

Can you cite said experiments please?

Jay2TheRescue

07-02-2009 08:22 PM

Quote:

Originally Posted by ************* (Post 137603)

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.

imzjustplayin

07-02-2009 09:24 PM

Quote:

Originally Posted by Jay2TheRescue (Post 137623)

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.

Jay2TheRescue

07-02-2009 10:25 PM

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...

theholycow

07-03-2009 03:34 AM

Quote:

Originally Posted by ************* (Post 137622)

Can you cite said experiments please?

Jay2TheRescue

07-03-2009 05:53 AM

https://www.motherearthnews.com/Green...onversion.aspx

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