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Why do Diesels, especially Cummins make so much noise? Why do they rattle, and shake, vibrate, and move so much? And what is that distinct sound a Cummins makes at idle that no other diesel engine really makes? Is it the valves opening and closing (valve clatter)? Or the injectors injecting fuel? Whichever it is, it sounds awesome!!
Thought this would make for a cool topic of discussion.
__________________ 04.5 2500 4x4 Built auto: Decommissioned and in the process of building....questing for a low 700
In general a diesel is loud due to the fact that the fuel is exploding under compression without a ignition source like a gas motor which uses those nasty things called spark plugs. so basically what happens in the cylinders is the diesel is exploding under high compression and thats the general reason for the shaking and loud motor. I'm sure that someone could explain it in a lot more detail, i just gave a bumper sticker version.
You just can't beat the growl of a Cummins at idle. On the other hand, my F350 sits at idle and sounds like a jet, which is kinda cool, but I'd rather have the Cummins growl....... If I had the funds.......... my truck would become a fummins real quick like. I love the truck, but I hate the motor. I know.... I didn't answer your question........ Sorry. LOL!
A lot has to do with the injection systems and injectors along with the the fuel being ignited by compression. Also most diesels are almost all gear driven...crank, cam, pump, etc.....you see a lot of change to other systems such as belt or chain to do away with the sound...which i think is stupid...a diesel is suppose to be loud.
Daily Driver: 2004 Ram 2500 Quad Cab 4x4 Long Bed Automatic 5.9l CTD 23k miles and counting, 4" MBRP Turbo Back exhaust 1995 ram 2500 4x4 auto trans
i had always wondered this too i thought it was the compression but i never was for sure and then you add the exhaust on like most of guys have and they get even LOUDER! lol
2002dodge ram 2500 cummins 24valve turbo 6 speed A.R.E. step bars new upgrade!4in. straight pipe STOCKER BUT IT STILLA ROCKER!
2005 jeep grand cherokee "i have a addiction and that is chocolate milk" -ME
what you usualy hear is the sound of the explosion.
But how do they make the newer trucks quieter, simple inject the diesel in sets, ie
89-2002 diesels used 1 injection pulse per power stroke, once you move to the common rail era the pumpers move up to 3 injection pulses. then you get to the 6.7's where i believe there are 5 injection pluses , 2 before 1 at tdc and 2 after (for emissions), the more pluses the more controlled the explosion, thus the quieter in operation..
i think its the sound of my engine eating its self lol.
99 3500 Built DTT Auto, 600 lower TC, 3.55, 4x4, BHAF, 6" lift, ARP's, Danin Optix, Gauges, DAP 100hp sticks, FASS 95, 2LO kit, HIGH Idle, Silencer ring delete, 4" exhaust, SMARTY, 03 VW PASSAT 1.8T Big Thanks to (FTE Diesel),(DAP),(DTT) They ROCK!
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