advancing injection timing tomorrow

[jaynes]

Hey All,



I'm advancing my injection timing tomorrow, my wrench from PDR is in now, and I just want some basic info about how to go about it. I know it's supposed to be turned about 1/8 inch toward the engine, but what else besides that should I be aware of? Thanks for your time!



jaynes

 

[SClements]

As far as i've been told, if you push it too far you'll get alot of detonation, really bad pinging that you'll notice for sure. I've done a couple and moved them as far as you can and never got a bad result. What type of wrench did you get?

Seane

 

[nascar mark]

Originally posted by SClements

As far as i've been told, if you push it too far you'll get alot of detonation, really bad pinging that you'll notice for sure. I've done a couple and moved them as far as you can and never got a bad result. What type of wrench did you get?

Seane

Someone is giving you bad info.

You can push your pump as far as it can go towards the engine and you won't get any detonation. Your thinking of a gas pusher. Our engines will not cause pinging by advancing timing of the injection pump. It will raise cylinder pressure as more fuel is injected before tdc.

Comes down to your set up and seat of the pants feeling.

 

[Power Wagon]

First, I'd like to point out that the timing on our trucks is not optimal to begin with, it's run kind of "late" to reduce cylinder pressure, smoke, and maximum combustion temperature, thereby reducing NOx emissions.



Advancing the timing will generally give you better "seat of the pants" feel, especially if yours was exceptionally late. Also, if you have a pyro, you'll notice that max temps will decrease a bit, and usually cruise temperatures will fall slightly, and this is due to improved efficiency. The heat is not coming out the exhaust pipe as much.



If you do this with stock injectors, you'll notice it quite dramatically increases the noise level at cruise and idle. It will sound harsher and have more "clatter" than it used to have.



If you go too far, it becomes quite nasty sounding, and you will lose power. In my attempts, I noticed a dramatic loss of power at the low end, a LOT more smoke there, too, and even a little more smoke on the high end, without changing the fuel any.



Over-advancing your timing, especially to the point it loses power, or begins to sound quite harsh, is stressful on the engine. The peak pressures inside the cylinder shoot up dramatically, yet, you actually end up with less power than you had before. Also, dumping fuel in before optimal time to combust can result in raw fuel reaching the cylinder walls or piston top, resulting in some bad effects there, too.

 

[Case500D]

Hi Jaynes,



Make sure to loosen all three mounting bolts and the rear support bolt. If the pump sticks a bit you can gently motivate it with a rubber hammer. JFitzgerald retimed my truck for me. He did it so fast, I hardly saw what happened becuase I was cussing at the turbo trying to change the housing. Anyway, it is easy and should help your truck out.



Jeremy



PS Make sure there are factory timing marks on the pump and gear case. My truck did not have a mark on the pump, so we had to center punch one.

 

[Excessive Force]

TIMING ADVANCED

I got a chance to try out my new wrench from PIERS today. There was a line already made on the pump,and gear housing,so i loosened all of the bolts,and rotated the pump 1/8". Loosening the bottom bolt on the pump was a . I wound up removing the p/s pump,and then it was easy to reach. I also had trouble getting the pump to rotate,but i took a piece of angle iron,and drilled 2 holes in it to line up with the 2 holes in the rear support bracket. That gave me the leverage i needed. I only had time for a quick blast down the road,but so far i've noticed a drop in EGT'S,and that's something i've really needed.