So, this is going to seem a little off the wall to some of you, but I was hoping to possibly find some help anyway. I'm trying to install a home-made cylinder cut out system to my 96 dodge ram, 360. Since it is a multiport fuel injected engine,I plan to use a single coil, multi pole relay to cut out four cylinders, wired to a switch so I can activate the system on the highway. I expect to get a MIL lit up as soon as I hit the switch, but if it saves me some mileage, I can put up with it. What I'm trying to find out is which four cylinders should I cut out to have the smoothest running engine? Also, what kind of mileage can I expect to gain and if it is even worth it? Anyway, tellme what you think or if anyone has tried something similar to this. Thanks!

 

Welcome to Dodge Forum!

Just wondering, but isnt the fuel still being pump'd into the cylinders?

Here is the firing order. I guess you would want it every other?

[IMG]local://upfiles/60925/FC356E311B7F4FC8BF1881F98C8BECDD.jpg[/IMG]

 

If i were to cut out the spark, yes, fuel would still be pumping in. but since each cylinder has it's own fuel injector, i can cut outpower to any specific cylinders injector, stopping the injector from opening. ps thanks for the f.o. chart

 

what about the valves , camshaft ? sorry wont work , end up breaking stuff

 

np for the chart, I guess I didn't see fully grasp what you said. I just remember my dad messing with our old v8 mercury montego and pulled one of the plug wires and told me it was a 7cyl just to mess with me. Thats why I thought of the fuel still pumping through.

Good luck!
pcfixerpro

 

the valves, camshaft, pistons and all will still be operating normally, since they are all mechanical systems. all i want to do is cut off the fuel supply into the cylinder bore, so when the spark plug fires, nothing happens, replicating a "missing" cylinder. If i get the right cylinders cut out, which according to the f.o. chart posted, looks like 235 and 8, the rest of the cylinders should make the engine run fairly smooth, and shouldn't have problems with breaking anything

 

With all due respect PA, how many times do we see people with "Missfire cyl #7" or something like that. It happens and the engines still run. I don't know if I would take it to an extreme as to limit it to a 4cyl, but bwest05dm, if this is something you really want to try.... I would say drop two cylinders to make it a 6 and experiment from there. I don't know if I would dive to a 4cyl right away unless you know someone has messed with stuff like this before. Iunno.. just some food for thought.

 

If there's no detonation half the cylinders aren't they going to wair funny?
If there's no combustion what's going to push the piston back up? it's probablygoing to mess with your pre-catalytic converter oxygen sensor.

I'mthinking pcm will try to dump extra fuel into the 4 cylinders that are operating to compensate for the4 that aren't and burn them up. But that's just speculation. I'm not really sure what will happen.

 

I would disagree. They have similarsystems on many of the newer engines. I believe the HEMI has a similar type system as well to help out with mileage.If this is just a simple cut the power to the injector type setup, you will likely see a CEL code thrown. But in a highly integrated OEM setup with the computer doing some additional control work, it can work quite well.


Momentum... You can think of it like riding a bike. If you are going at a decent speed, you can continue to ride your bike only pumping with one leg (but you might look a bit special )

Not trying to ruffle feathers... but this is something that is technically possible and currently implemented.

Cartman

 

To accomplish this, the fuel injection is turned off, and the valves are stopped for those cylinders. Chrysler and GM use electric solenoids that control oil flow to special hydraulic lifters. When the oil is turned off, the lifters unlock, taking up the movement of the camshaft inside the lifter instead of moving the valve.

well if he had a "newer " truck with MDS he wouldnt be here starting a thread.. either 1. buy a motor with MDS , 2. ruin the motor you got now.. once you figure how to stop valves , control the oil flow ...simple right ??? LOL

Here a MPG with MDS , the Ram is still a big, heavy vehicle that consumes a lot of fuel. Fuel economy (combined) for the HEMI version is 15.6 miles per gallon US. Fuel economy for the 4.7-liter V-8 is 15.9 miles per gallon.