Diesel sound

[Jdonoghue]

I've noticed that the 24-valve engines sound much different than my 1st gen. Do all of these things sound different? (1st gen vs. 2nd gen 12-valve vs. 2nd-gen 24-valve)

 

[HoleshotHolset]

Yup - they all sound different for good reasons too...



Injection pressure from early models to late models has increased significantly... . so has the amount of timing - all in an effort to reduce emissions, increase throttle response, increase efficiency.



Out of all the 'pump-injector' 6BT's - the 1st Gen trucks with the VE-44 are the most quiet.



The 2nd Gen P-7100 pumps are in the middle of the road - that P-7100 itself makes a TON of racket.



The 2nd Gen VP-44 equipped engines are the loudest of the bunch - they have the most timing and highest injection pressures out of the 1st/2nd Gen trucks.



The 3rd Gen (common rail injection) ISBe's are the most quiet out of them all - I'm even of the opinion that the '04. 5+ trucks are quieter than the '03-04. 4 trucks... due to the added injection event... and possibly quieter than the GM Duramax.



With multiple injection events (2 or 3), (on the 3rd Gens... ) the cylinder pressure increases in stages - instead of one injection event and one big noisy combustion event.



I've also heard a few 2nd Gen ISB's with EDM injectors that were much more quiet than the 'usual' ISB... again - it has to do with injection pressure and how (efficiently) you're burning a given slug of fuel in the cylinder. Piston shape, compression ratio, and even injector protrusion/placement also play a role in this whole game...



Matt

 

[Forrest Nearing]

those VP-44 sure do sound sweet!

 

[klenger]

I love the (lack of) sound of the 600's.

 

[cumminspwr01]

And I love the noise of the over-fueled, over-valved trucks. Oo.

 

[klenger]

24V Cummins http://www.klenger.net/dodge/2nd-gen-reference/isb-start.wav



04. 5 600 goes "hummmmm"

 

[Tcolesanti]

I don't know about those new 3rd gen's. I have to look at the "C" badge on the fender to know its a Cummins... ... ... ..... Not loud enough for my liking.

 

[Big_Daddy_T]

So I have something bothering me. If the clack is the sharp rise in cylinder pressure. The isb has the highest initial rise. Would this affect the wear of the bearings. Cummins claims it lasts longer than the 12v but I have been very skeptical of this since day one. If I was to pick a horse in a stamina race. Id pick the 12ver.

 

[Hohn]

ISBe should be the longest lasting.

 

[Forrest Nearing]

the fuel pumps are another matter

 

[HoleshotHolset]

Big_Daddy_T said: "Would this affect the wear of the bearings. Cummins claims it lasts longer than the 12v but I have been very skeptical of this since day one. "



Yes, it would affect the wear of the bearings. Probably not as much as a 12-valve running 35° of pump timing, though...



I don't know how Cummins can claim that an ISB will last longer than a 12-valve. The ISBe has the potential to last the longest (strongest block, multiple injection events, EXTREMELY variable timing, etc. ) - but like Forrest said... all the stuff that bolts to 'em will wear out long before the engine itself.



Matt

 

[mike r]

I love pulling up next to a new PSD or DMAX and they look around like the can't understand whats making all the racket. ME!

 

[nickleinonen]

Originally posted by Tcolesanti

I don't know about those new 3rd gen's. I have to look at the "C" badge on the fender to know its a Cummins... ... ... ..... Not loud enough for my liking.

so if you get one like mine with no badging you won't even know??? :-laf although the 5" make some noise when you get on it...

 

[Greenleaf]

I too believe that all the stuff bolted to theses engine will crator long before the engine will.



I manage a truck fleet with B engines from '89 to 03. They all have a particular sound. I don't know about longevity as we have yet to wear one out. I do have some #53 engine blocks and the ISB's will be FORD (Found On Road Dead) where as the P pumped and rotary pumped engine simply run and ask for more



The ISB gets my vote for the best sound. There are nine of them here. The P pumped engines are the most trouble free. There are too many to count



Scott

School Bus Fleet Manager

 

[Jdonoghue]

Originally posted by Greenleaf

The ISB gets my vote for the best sound. There are nine of them here. The P pumped engines are the most trouble free. There are too many to count

Scott
School Bus Fleet Manager

I've seen a 24-valve engine with a P pump on it (on this site, not in person). Wonder if it sounds the same as a 'normal' 24-valve? All we need to do now is get someone to try putting a VE pump from a 1st gen. onto a 24-valve engine and see how that works If only I had tons of money to burn and time to burn it...

 

[TURBOs4LIFE]

Originally posted by klenger

24V Cummins http://www.klenger.net/dodge/2nd-gen-reference/isb-start.wav



04. 5 600 goes "hummmmm"

Even the starter on our trucks sound beefy... . definitely a well built engine

 

[Vaughn MacKenzie]

Originally posted by Jdonoghue

All we need to do now is get someone to try putting a VE pump from a 1st gen. onto a 24-valve engine and see how that works

I doubt anyone's tried that but it's a fascinating idea. The old VE style pump features something the P7100 pumps do not---dynamic timing (varies with RPM).



But alas the ol VE pump has limitations on fuel flow, and it's pretty tough to get past the low-mid 300s on the dyno. Old Smokey and hdm48 are the VE-pump gurus on NW Bombers.



Oregonpharmer on NW Bombers has done a few P-pump conversions on the 3rd Gen trucks with great results. Downside is you better show up with at least $10k in your hand



Vaughn

 

[Jdonoghue]

Originally posted by Vaughn MacKenzie
I doubt anyone's tried that but it's a fascinating idea. The old VE style pump features something the P7100 pumps do not---dynamic timing (varies with RPM).

But alas the ol VE pump has limitations on fuel flow, and it's pretty tough to get past the low-mid 300s on the dyno. Old Smokey and hdm48 are the VE-pump gurus on NW Bombers.


Vaughn

I was not aware that the P7100 did not do dynamic timing. Interesting. If I ever have a ton of money to waste I'll try putting a VE on a 24-valve engine. I like to do things just to see if they can be done. You could probably get more miles out of it than the VP44