Turning up the fuel

[SPoe]

My truck, engine wise, is completely stock besides the exhaust and i want to get it to dump a cloud when i put the pedal to the floor, ive been told to "play" with the smoke screw but i'm not sure exactly what to do, i found this on thedieselgarage.com

For the 89-93's (Bosch rotary pump)there's a screw behind a tin access cover about the size of a nickel. It takes a 1/2"(13mm) to break the jamb nut loose, then take the screw out. It'll have a metal band welded on it that needs to come off. Once that's off you can run the jamb nut farther out(towards the outside of the pump, about 2 turns). Then put it back in and test, some smoke more than others(especially with Lucas POD injectors!). The pre boost power adjustment is under a cover that looks like a vacuum diaphragm, and it is one. It has a torx bit with a jamb nut. Loosen the torx for more low end & tighten for higher. The governor spring is different than in the later 12 valves, and is not adjustable.
The other adjustment is to rotate the diaphram, under the top cover with 4 screws. Use the picture at right as reference. Turn the diaphram clockwise 90-120 degrees, this is like sliding the fuel plate on a 94-98. Now put it back in & test.
The best bang for the buck, is to get a gov spring, most of the time they are under $20, and let it rev up to 3200 rpm. If you plan on a gov spring, hold off on doing the fuel screw shown above, it needs to be close to stock setting. Great instructions are here:
http://dens-site.net/Dodge_CTD/Gover...ing/index.html

so my question is has anyone tweaked their smoke screw or installed a governor spring and are is there another way to get my truck to dump a cloud?

 

[Makaio]

SPoe,



Turning the smoke screw (Torx locked with a 1/2 nut) clockwise will increase your low end fueling. It's good for get up and go around town driving. It will, however, increase smoke and EGT's will climb faster. You mention about dumping more smoke. Smoke is simply unburned fuel. Most of us here are striving for less smoke with the most power. I have my smoke screw backed out all the way. Turning your fuel screw clockwise will increase power but will also increase smoke. Hope this sheds some light for ya.



Aloha,

Matt

 

[DThibault]

3200 governor spring

I bought a 93 from a local business that was used pretty hard but maintained. It has 150,000 miles on it which is nothing compared to my better maintained 91. Anyway the 93 has a relatively new injection pump on it from Cummins but the truck skips at idle and doesn't seem to rev as high as my old 91, which by the way has had a Banks turbo housing on it. Where do I start with the 93? I ws thinking injectors to smooth it out, ( I have adjusted the valves) and then turn the pump up a little, but the governor spring sounds like the ticket to get the revs from it. Where do I get one of those? Thanks

 

[BradG]

get one from pdr for less than $20.

 

[PToombs]

Any Bosch injection pump shop. If they don't know what you're talking about, have them look up a stock governor spring, change the last 3 numbers to 366. This is the 3200 spring.

 

[glhs]

so my question is has anyone tweaked their smoke screw or installed a governor spring and are is there another way to get my truck to dump a cloud?

Nope. Nobody that I know. :-laf:-laf:-laf

 

[SPoe]

Thank y'all for your replys, i probably wont be messing with the engine anytime soon since i only get 16 mpg on average and im headed off to college not too long from now but thank y'all for y'alls information

 

[glhs]

No matter what injectors I've tried or how much the fuel is turned up, I have always got the same mileage since it was bone stock. Fuel usage is controlled by the right foot IMO.