Making the 2003 engine noisy

[Animal]

Why not just turn the pilot injection off, this should make the new engine just as noisy as the older engines. I'm not sure if this will affect the emissions of the engine but with a little programming the noise should be back.

 

[SOOT]

HMMMM.....



I like that idea Oo. Oo.

 

[HillCountrykid]

On the Duramax, the pilot injection turns off at 2500 RPM (I think it's 2500). Well, it's supposed to, but they were having problems with it not turning off last year.



Brian

 

[WileyCoyote]

Pilot Injection

I sure hope that the pilot injection can be reprogrammed on the new engine. Having the engine operate at optimum timing is best for power and efficiency.



The Powerstokes have the pilot function built into the injector with special porting. If I understand the new high pressure common rail correctly, this may be correctable with software.



Keep your finges crossed.



Harry

 

[Cummins Corvette]

It will probably be harder on the engine because of the increased harmonics. That noise is coming from the sudden spike in cylinder pressure, and is sort of like hitting the piston with a hammer on every power stroke. On the other hand, it would be a lot easier on the injectors because they only have to open half as often.

JM $0. 02.

 

[bighammer]

That should void a warranty pretty quick

 

[MCummings]

Originally posted by Cummins Corvette

It will probably be harder on the engine because of the increased harmonics. That noise is coming from the sudden spike in cylinder pressure, and is sort of like hitting the piston with a hammer on every power stroke.

The 12V and 24V Cummins Have been operating a LONG time with a single injection period.



I figure if the cylinder pressure spike was bad that the Motor couldn't go 400,000 miles. Not saying the lack of a cylinder pressure spike won't help longevity, but that turning off the feature shouldn't hurt the motor, unless maybe Cummins redesigned the harmonic balance to not have to deal with the shaking caused by the cylinder pressure spikes.



Just a thought,

Merrick Cummings Jr

 

[Cummins Corvette]

Don't forget that this engine is not the same as the old one. It was designed without the pressure spikes in mind.

 

[WileyCoyote]

Pilot Injection

For those of you who wonder why we are going to have pilot injection, here is my explanation.



Pilot injection is a very small early charge of fuel to begin the combustion process. It is very early in timing and not appropriate for the full charge. The main charge can then be injected later because the "fire is already lit" by the pilot charge.



We are getting pilot injection for two main reasons: 1) It reduces NOX emissions by LOWERING combustion temperatures because of the later, non optimum injection timing, and 2) It reduces noise for the combustion event, making the noise pollution people happy.



Since pilot injection does not provide the engine with optimum timing, the power output suffers and so does the overall efficiency of the engine. The power can be recovered by more fuel injected later, but the mileage takes a hit.



This is why the earlier powerstokes get much better mileage than the current ones and likely why the Duramaxes do not equal the mileage of the Cummins.



For my uses, pilot injection does nothing beneficial, but we are going to get it whether we want it or not.



As far as durability, real diesels are built to take optimum timing. Those of you that think the loud noise is a more stressful event are correct, but manufacturers like Cummins and Cat know how to cope with the problem.



I still hope this can be dealt with in the software. Keep your fingers crossed.



Harry

 

[BILLUA]

I do have a choice about getting the pilot injection. . want to know why??

Because I hate the look of the new trucks and DC still hasn't gotten a clue about building a true crew cab...



Yes gentlemen, we DO have a choice

I'll be keeping my '01