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#1
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Why do 300SDs sound like that?
I have driven two differnt 300SDs now, and a 300TD. I notice the 300SD has a kind of "electric motor" sound to it when you are inside the car... Hard to describe, but it is like a humming, which changes pitch with speed. Kind of like an electric remote-controlled car. My 300TD had nothing of the sort. What is this? Am I crazy?
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles |
#2
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Could it be that both 300SDs had a misaligned exhaust pipe that was slightly vibrating on the floor?
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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags |
#3
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I have it too, only happens when accelerating, disappears when you let go of the gas... Sounds like something in the drive line
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Ich liebe meine Autos! 1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete 1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday... 1981 Mercedes-Benz 300SD | Rear ended, retired in garage. 2009 Yamaha AR230HO | Das Boot Excessive speeding? It ain't excessive till I redline! |
#4
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Mine too!
Kinda like a turbo noise but lower pitch and comes on with acceleration. Not the turbo cause with the windows down i can hear the turbo whistle. I am thinking it is the fan but not sure. My 300d did not do it with the same fan though so i don't know. Steve
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85 300d in progress |
#5
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well, at least I'm not crazy... I haven't had a chance to drive mine a lot since I got it (problem with the alternator), but I noticed it with another one I drove before as well. It is strange that even though the car is mechanically very similar to the other 300's, it sounds so different. One of you MB nerdz will know what the sound is, I am sure.
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles |
#6
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I agree that the 300SD's sound different, but they also have a double fire-wall for sound insulation, and the car is a different chassis so it will resonate sound differently. Our 300D reminds me of a British taxi the way it sounds inside...low...diesely...pretty quiet. The 300SD has more of an engine sound, but is quieter overall. I like them both though.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#7
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I always wondered about 300E's as well. My friend's 300E had a lot of whine when it would accelerate. It sounded like a supercharger at times. I dunno if it was just gear whine, or just his car or if all 300Es are like that or what. But those 300E's are so quick compared to the diesels!
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1985 CA 300D Turbo , 213K mi |
#8
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Quote:
Yeah my 300SEL sounds like that at full throttle.
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#9
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my 116 300sd has a different sound then my 123 300d as well.
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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12 1982 380SL 1978 450 SEL 6.9 euro restoration at 63% and climbing 1987 300 D 2005 CDI European Delivery 2006 CDI Handed down to daughter 2007 GL CDI. Wifes |
#10
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Its probably gear whine, a lot of cars do it.
My 300SD does it, my neighbors Saab does it, and the 599GTB that drove past me today while I worked on a boat did as well. I think its because of the way the gears are cut, I know on race cars its quite noticable, like you need ear plugs.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#11
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Hmm comparing a 599 and a 300SD? Odd comparison wouldn't you say
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#12
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Quote:
An F1 gear box has a lot in commen with the 722.XX, yeah...
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#13
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I'd say the same thing... but I hear it backwards... My TD has the whine and the SD and 190 don't. The TD supposedly has a rebuilt tranny though.
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John Robbins '05 E320 CDI - 240k '87 300TD - 318k |
#14
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Hmmm... now that I am up and driving this car again, I was reminded of this thread today when my wife asked me "what is that sound that sounds like a jet?" I couldn't remember what you all said about it, so I came back to look...
Well, this sound definitely is not just with acceleration. It corresponds to the speed the wheels are turning and it comes from the rear of the car. It is actually at any speed, getting higher in pitch the faster you go. Gear whine sounds like the closest thing to me... it is definitely not the exhaust rubbing on anything and it is not limited only to acceleration, but I definitely heard this in both the SD I own and another one I drove. Really I don't know how to describe it other than that it sounds a lot like an electric motor. I think golf carts probably sound like this, but I don't think I have ridden in a golf cart since I was about 10.
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles |
#15
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straight cut gears are loud...
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