The previous fuel system had six fuel lines from the Bosch pump - the pump
mechanically drove duration and injection timing. The new fuel system is a
"common rail" fuel system - one line runs from the pump and splits to the
injectors. The computer tells the injectors when to inject and how much.
Old news in the car industry, but keep in mind the cylinder pressures
involved in a diesel combustion cycle.
The new fuel system allows a small amount of fuel to be injected which
starts the combustion process, then the full shot is injected. This process
is the key to the noise reduction. It is much quieter - a lot of work was
required to reduce the turbo / exhaust noise level. We didn't realize how
loud it was on the previous engine!
Scott
----- Original Message -----
From: "Jim Miller WB5OXQ" <wb5oxq@clearsource.net>
To: <dakota-truck@dakota-truck.net>
Sent: Sunday, October 06, 2002 11:16 PM
Subject: Re: DML: 2003 Ram Diesel
>
> I don't know about noise at full throttle but at idle with the hood closed
> you probably would not know it was running unless maybe inside a quiet
> garage. Outdoors you cannot hear it unless you put an ear against the
hood!
> It is unbelievably quiet. Go find one and see for yourself. I asked the
> salesman how they got it so quiet. He said new head design, different
> injection system greatly reduced noise and increased hp a lot too. The
> Cummins has always been the fuel mileage champ too. I also know lots of
> them have gone over 400k without an overhaul. Ferds break down a lot I
hear
> from owners. I work at an independent garage ya know. We see lots of
> trucks in our shop mostly for A/C installation and repair. This Ram is a
> lot quieter than a Mercedes diesel car!
> ----- Original Message -----
> From: <Olznut@aol.com>
> To: <dakota-truck@dakota-truck.net>
> Sent: Sunday, October 06, 2002 9:31 PM
> Subject: Re: DML: 2003 Ram Diesel
>
>
> >
> > Hmmm, the reason my Dad will not buy a Ram was because of the old
Cummins,
> > noise, etc. He's gonna buy a rather large luxury 36' or so 5th wheel
> travel
> > trailer (ahhh, retired life) and is looking at a Ford. He keeps telling
me
> > how quiet the Power Joke is. I'm TRYING to get him to look at the Dodge,
> but
> > is dead set against the Cummins Clatter. Looks like I'll have to try
> harder
> > now :) I think he'll like the new interior, he likes my Dak's interior.
> And
> > the addition of a 3500 single rear wheel looks good as well.
> >
> > Ed "Olznut" Halterman Sunland, Ca '01 Dakota Quad Cab SLT+ 4.7L 4x4
> "Silver
> > Streak" '66 Olds F-85 330 V-8, Intense Blue "Project Olds" Will Be
> Finished
> > By The End Of July!! See Them Here!!
> > http://community.webtv.net/OLZNUT/WelcometoOlznuts
> >
> >
> >
>
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:47:16 EST