Even my question not be about Mercedes Benz, I am curious to know why from different car manufacturers their diesel engines has different level of noise.
I have noticed that Ford F250 engines are louder than any other truck diesel.
I know many other truck diesel with almost same size engine but none of them has the engine so loud as Ford F250.
Can someone explain to me why those F250's are so noisy?
Thanks.

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Nyck - TX - USA

Evidently you have not ever heard a Dodge with the Cummins engine! They are by far the loudest Diesel engine of the Big Three.

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All Diesel Fleet (well mostly)
'04 S211 E320 wagon
1984 300TD 627,000 miles
1985 R107 300SLD TURBODIESEL

For Sale: Diesel EGR Delete/Block-off Plate Kit
1985 CA emissions 617 owners- You Need This!
Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst.
F.S. Accessory to run condenser fan & compressor clutch together
Sanden Instalation Guide (post 11):
http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html

It is difficult to sell a vacuum carpet cleaner that does not make a lot of noise --- it doesn't sound like it is working. Noise equates to power for some people. The machine that makes the most noise sounds like it is the best.

Dodges are not that loud tbh. The Cummins is rather quite.

The old 7.3 DI diesel is LOUD as hell.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1990 Subaru Legacy AWD 5 speed - 119,900 miles? Brother's Daily

1997 E300 Captain Slow - 218,000 - needs repair

2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.

My old Kirby vacuum cleaner is like having a 707 jet running but it sucks like no other before or since, I'll keep it .

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-Nate
1982 240D creampuff 370,000 miles
1978 300CD back from the dead&1980 300CD ~ SOLD
1984 300CD KEEPER ! 478,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed stickshift SOLD & missed
Krazy Kommie Ural Motos (3)
BMW Moto R60/6 Barn Find, 8,000miles
1959 VW #113 Deuxe Beetle, 36hp engine, stock
Junk, Rust, Arthritis, Crushed Spine,Broken Neck&Back
Memories, Peace Of Mind
facts & reality don't change because you can't handle them

Some cummins are more noisy than others. It has a lot to do with the muffs.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Yes, the older ones are way loud. Most all the newer engines (from the Big Three) that are common rail and/or direct injected are much quieter.

__________________

All Diesel Fleet (well mostly)
'04 S211 E320 wagon
1984 300TD 627,000 miles
1985 R107 300SLD TURBODIESEL

For Sale: Diesel EGR Delete/Block-off Plate Kit
1985 CA emissions 617 owners- You Need This!
Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst.
F.S. Accessory to run condenser fan & compressor clutch together
Sanden Instalation Guide (post 11):
http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html

Isn’t the noise of a diesel mostly determined by the injection pump ?

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1995 e320
1994 e320
2004 Jeep wj overland
2001 Ducati 748

A lot of the newer diesels are downright quiet. Pilot injection and a smooth pressure increase vs. just a big chunk of fuel all at once and a pressure spike makes a huge difference. My girlfriend's '13 TDI Beetle, while definitely not a gasser, is no louder than a gasser with the windows up.

My 617 is noisy noisy, almost Cummins like jarring. None of the other 617's I've heard sound like that. Timing is perfect and it runs well otherwise, so I don't worry. I do wonder, though.

Edit: If anyone's in Oregon with a normal running 617 and would be willing to meet up and compare notes, I'll buy lunch or coffee or whatever.

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617 swapped Toyota Pickup, 22-24 MPG, 44k miles on swap

The PowerStroke diesels use a hydraulic HEUI injector setup that runs off oil pressure to fire the injector. Each injector has a spool valve in it and is electronically controlled. The early 7.3's had a single-shot injector. They were LOUD due to the diesel knock of each injection event. Later 7.3's had multi-shot injectors and were a bit quieter, but still pretty agricultural. The 6.0's improved the multi-shot setup and the 6.4's got it to the point that they were very quiet (but one of the worst engines Ford/Navistar ever made). The current 6.7's are extremely quiet in their stock form due to the multi-shot injection and common-rail setup.

Our old IDI diesels aren't exactly silent, but when well tuned they're remarkably quiet. My 3.4L "rod bender" is so quiet when idling that the loudest part in the engine bay is the "clack" of the delivery valves or the cooling fans if the A/C is on.

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'11 Honda Accord EX - "The Daily" 69K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "Diseasel Jr." 173K
'94 BMW 530i Touring - "BMWtf LoLwagen" 233k

International 7.3 is loud?

Im believing that the person has not heard a 5.9 litre cummins diesel even at idle.. - It has the most bassy firing knocks that are heard from afar.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

There is a difference in clatter between direct injection engines (OM617 for example) and common rail injection systems which are notably quieter.

In addition, a lot of the clatter in the OM617 originates in the vacuum pump. Both older diaphragm and later piston types are noisy.

OM617 is a prechamber engine. Direct injection is usually louder.

Exactly what I said in post #2

__________________

All Diesel Fleet (well mostly)
'04 S211 E320 wagon
1984 300TD 627,000 miles
1985 R107 300SLD TURBODIESEL

For Sale: Diesel EGR Delete/Block-off Plate Kit
1985 CA emissions 617 owners- You Need This!
Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst.
F.S. Accessory to run condenser fan & compressor clutch together
Sanden Instalation Guide (post 11):
http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html

There are a lot of guys in this post talking about "noisy engines" but none of them, except "diseasel300",explaning the reason why the engines are loud.
Can other guys try to explain WHY that engine is noisy?
Why mean for what reason the engine is louder than other diesel engines.
Thanks

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Nyck - TX - USA