Injectors Experiment...

[njdrsubaru]

here is what i am thinking:

 

unplugging a injector to have the car running on 3 cylinders.. i know it will be vibrating more, but will it totally disable the supply of fuel to that cylinder? also is there any damage causing to the cylinder running with no injector on?

 

this is on a EJ22, i disconnected it and went out for a ride. I felt some unusual vibration under 30 mph then above that it sorta evens itself out. remember this is an experiment not a problem

 

what are your thoughts?

[nipper]

Of course it will cut off the fuel. The vibration can cause damage. Also you will use more fuel as the other three cylinders must work harder to get the car up to speed. Also since it is now not pulling its own weight, its just an air compressor, requireing more fuel from the other cylinders to move the dead cylinder.

 

nipper

[njdrsubaru]

how can the vibration cause any damage?

[OB99W]

how can the vibration cause any damage?

By accelerating wear, and if severe enough, inducing metal fatigue that might lead to catastrophic failure.

[OB99W]

here is what i am thinking:

unplugging a injector to have the car running on 3 cylinders.. i know it will be vibrating more, but will it totally disable the supply of fuel to that cylinder?[...]

It will totally cut the supply to that cylinder, if the injector isn't leaking at all.

 

 

this is on a EJ22, i disconnected it and went out for a ride. I felt some unusual vibration under 30 mph then above that it sorta evens itself out. remember this is an experiment not a problem

I assume you're attempting to determine whether this will result in better fuel economy. As Nipper pointed out, the 4th cylinder will be a load on the engine. Cars that drop cylinders to improve fuel economy address the valve train as well as the fuel, so the unused cylinders aren't pumping air from intake to exhaust. Also, injecting large volumes of air into the exhaust can have "interesting" results on the engine management system, etc.

 

If you're still inclined to experiment, I'd suggest at least wiring a switch that can be operated from the driver's position to the injector. That way, you can try cutting the fuel only above the point that vibration seems to disappear, and be less likely to cause damage.

[nipper]

Also if tyhis is the engine with the rod knock, that extra stress is going to wipe out that bearing in no time. There is a reason that companies spend a small fortune on balancing engines, and why they last so long. But then again, if this is the one with the rod knock, its doesnt have long on this earth anyway.

 

 

nipper