pre injection?

[TCluff]

how do you get rid of the pre injection event, in hopes of keeping a little more rail pressure

 

[Reb.B]

i don't think you want to do that. Maybe lesson it or on the 04. 5 and above maybe get rid of the last emmision shot. I've been toying around with the idea of thinkening the diesel to raise pressure and put to good use the primarry shot. More BTU's, longer burn and use the primarry to get the fire rolling. If you want more press. you should think about secondary fuel press. adder, opening the cp3 up, and lessen the duration. Also you may have a problem else where if you have pres. problems. If you are still wanting to change your fuel map then you might want to talk to Marco. I'm sure that i can figure it out, but i would deffinately not get rid of the primarry shot if it were me.

 

[Dieselnerd]

I agree that the pre injection is a good thing. It gets the ball rolling without the high pressure which is not only quieter but has to be easier on the engine. If you could inject more fuel after that and eliminate the post shot it would probably have even more power and run cooler. Downside is it wouldn't meet the emission requirements.

 

[Reb.B]

Can somebody tell me how the third shot reduces emmisions? The third shot puts in more fuel, hurts MPG, it runs hotter so that should meen higher oxides of nitrogen, and stock truck put shoot out which is unburnt fuel. Only good thing I can see from the third shot is more expansion of gases and quicker spool up.

 

[Buzzer]

Can somebody tell me how the third shot reduces emmisions? The third shot puts in more fuel, hurts MPG, it runs hotter so that should meen higher oxides of nitrogen, and stock truck put shoot out which is unburnt fuel. Only good thing I can see from the third shot is more expansion of gases and quicker spool up.

Heats up the cat I believe.

 

[Scrappy]

what buzzer said, the third shot happens as the exhaust valve is opening and the fuel is burning as it goes thru the exhaust, that is why the '04. 5 and up run hotter

 

[Reb.B]

i understand why third gens run hotter, but what i always thought was the hotter an engine runs (hot egt's) the more oxides of nitrogen are produced, and that is what everybody is complaining about now.

 

[CRicker]

I don't know about you guys, but personally I am waiting on the p-pump conversion I think that will make these 3rd generations really sing! But, I guess if you want a quiet truck that meets emissions, then you'll have to deal with the cp3

 

[RMalone]

I think the third shot happens when there is realatively little oxygen therefore oxide emissions stay reasonable. But the extra heat helps with particulate matter. I would love to do away with the post shot I think aftermarket injector options would open up, and more duration could be used while still keeping temps reasonable and rail pressure up. Then again I don't know a whole lot about a whole lot!!

 

[Reb.B]

i hope somebody come out with a setup to change the map and get rid of the third shot. As for the p-pump conversion i think it is ridiculous. all you are gaining is strength and maybe more inj. life. I love the p-pump but it is limited. One more year and the common rail will be running circles around the p-pump.

 

[Blakers]

i hope somebody come out with a setup to change the map and get rid of the third shot. As for the p-pump conversion i think it is ridiculous. all you are gaining is strength and maybe more inj. life. I love the p-pump but it is limited. One more year and the common rail will be running circles around the p-pump.

I'm sure someone will come up with a box that will eliminate the third shot.



The nice thing about the P-pump engines is that they will run without electric power of any kind (with a manual shutoff) and will even run under water ---- like a diesel engine SHOULD and have been able to since the 1920s.



It seems like diesels have gone backwards in reliability since they've been computerized.



Blake

 

[Reb.B]

you are 100% right. the p-pump is the most reliable pump and injection set up out there. Plenty of power, rpm, and reliablity. I just think that adjustable timing, duration, multiple shots and the ability to spin a turbo faster is something that is really lacking in the p-pump set up. The p-pump engine will run for ever and the common rail has a shelfe life of 300 K until it gets costly. Only probelm is that the p-pumped trucks that have over 350k start costing you money in other ways (rest of the truck). In the back woods or anywhere where parts are not handy, the 12v, p-pumped, standard transmission trucks is the way to go. In the middle of Cali were parts are plentiful and there next day and the smoke nerds are constatly looking to nail your butt, the common rail is the way to go.

 

[p-Bar]

Heats up the cat I believe.

3rd shot keeps the cat hot which will reduce the emissions as some of you thought.

 

[Vaughn MacKenzie]

i understand why third gens run hotter, but what i always thought was the hotter an engine runs (hot egt's) the more oxides of nitrogen are produced, and that is what everybody is complaining about now.

Measured EGTs doesn't necessarily reflect actual combustion temperature. With the retarded timing, 3rd injection event and valve timing the exhaust temps will be higher than a 24-valve for example, yet combustion temps will be lower (to reduce NOx).



Vaughn

 

[Devan Manis]

i understand why third gens run hotter, but what i always thought was the hotter an engine runs (hot egt's) the more oxides of nitrogen are produced, and that is what everybody is complaining about now.

they are produced during higher combustion temps and cylinder pressure

 

[TCluff]

maybe i just need a cp-57 pump :-laf