Diesel noise
My wife recently asked the question when people were filing in the campground for the weekend "why are most of the diesels so noisy?" The only real answer I could give was because they made it that w...
Forum Discussion
rhagfo wrote:ib516 wrote:
The difference between the noisy ones and the quiet ones is in the injection system. Old diesels, like the 2002 and older 5.9L Cummins for example, do one injection event per combustion cycle. Newer common rail fuel injection technology (2003+ Cummins 5.9L) allows for multiple injection events per cycle, thereby spreading the explosive power over a longer time and quieting the noise of combustion.
This is pretty much the hitting the nail on the head!! Multiple injection events, electronic injectors, not mechanical.
I love the way my Ram pulls, not the way it sounds! I winter, I start plugging the block heater at about 40 degrees, as the engine is much quieter if warm.
This (multi injection events per cycle) is by far the main reason the newer diesels are quiet although the 2011 Ford is considerably quieter than our 2010 GM. I believe there is other technology that contributes as well - things like the block and oil pan material.
