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Diesel Noise Question

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Old 09-12-2018, 03:11 PM
SteveKoz
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Diesel Noise Question

I've been driving a '99 K2500 Diesel Suburban since new. Been a great truck but it's getting time for a replacement. Test drove a Lariat F350 Diesel. Sales guy got in and just pushed the button and it started. NO GLOW cycle? Engine was so quiet I said I wanted to test drive a diesel and he said, This is a diesel! So what happened to glow cycles and HOW can they run so quiet compared to prior motors? I know they added lots of emission components but the knocking and clanking sounds come from the engine and not out the tail pipe.. Can someone explain? Thanks!
 
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Old 09-12-2018, 03:16 PM
Horsehaulin8
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I went from a 99 f350 to a 17 f250, and i can actually order at the drive thru without shutting the truck off!!

Love the quietness of it. You can't even hear my neighbor coming down the road. (He has a 250 also)
 
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Old 09-12-2018, 03:26 PM
Tx.Hoon
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Most of the noise you would hear could come from the injectors and the fuel system. As far as the glow plugs they are really only required in cold climates and weather. The truck knows how long to wait on the plugs to warm when needed.
 
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Old 09-12-2018, 03:32 PM
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SteveKoz, welcome to the new diesel! Mine starts quick and runs quiet. And I wouldn't have it any other way.
 
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Old 09-12-2018, 03:52 PM
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Welcome to FTE, Steve! When I told the Mrs. I was buying a diesel, her reply was, "But they're so noisy and smelly!" To say the least, she wasn't pleased with my decision even though I had been saving for this purchase and it was my first new non-motorcycle vehicle since 1986. And let me add that she never buys a used vehicle. After a few miles of her first ride in my King Ranch I was amazed to hear her say, "This is nice."
 
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Old 09-12-2018, 03:56 PM
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One major change is the use of piezo injectors. Quieter, and more controlled combustion. That and sound deadener etc.
 
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Old 09-12-2018, 04:01 PM
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There is a delay to start that is engine temperature dependent. It is much shorter than on older trucks though.

I'm not totally up on noise management, but I believe it is a combination of higher rail pressure which provides finer atomization of the fuel and there are multiple pulses of fuel during the ignition phase.
 
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Old 09-12-2018, 04:06 PM
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New ones are much quieter but I do miss the distinctive clack of ye ole 7.3
 
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Old 09-12-2018, 05:11 PM
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LOL the oil burners are not like they used to be not even close ! I do miss my old 12 valve Cummins! To me it was music on a cold morning at start up!!!!
 
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Old 09-12-2018, 06:02 PM
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https://www.topspeed.com/cars/car-news/ford-releases-details-about-the-new-67-liter-power-stroke-turbocharged-diesel-v8-ar78600.html

Old article but may explain the reduced NVH in the 6.7
 
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Old 09-12-2018, 07:03 PM
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I also came from a Cummins and I agree that this truck is really quiet and fast to start !!!!
 
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Old 09-12-2018, 07:11 PM
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No one has mentioned that some of us are getting older and the hearing is going South, thus quieter diesels.
 
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Old 09-12-2018, 07:28 PM
SteveKoz
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[QUOTE=MPawelek;18191852]
No one has mentioned that some of us are getting older and the hearing is going South, thus quieter diesels.
[/QUOTE

Best explanation that I can relate too..

Appreciate the help! I'm a little concerned about all the emissions on these engines and I read or saw a video someplace about stagnent DEF crystallizing in cold weather? Was this a problem when DEF was first introduced or still a concern? I run my 6.5TD Suburban with a 4" exhaust with no CAT and a passthrough Muffler.. Basically open pipe from turbo to tail pipe. With all these new components in between the system might have gotten quieter but something tells me it's not "as" reliable. It's not going to stop me from getting it, I didn't like the F250 gasser I test drove BUT I feel I'm going to miss the simplicity of my 6.5TD.
 
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Old 09-12-2018, 08:23 PM
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I believe most modern Diesel engines that use DEF have one system or another to heat the DEF during cold weather to keep it from crystallizing. Someone correct me iffin I are wrong......
 
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Old 09-12-2018, 08:42 PM
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Originally Posted by MPawelek View Post
I believe most modern Diesel engines that use DEF have one system or another to heat the DEF during cold weather to keep it from crystallizing. Someone correct me iffin I are wrong......
This is correct. DEF freezes at 12 F. The truck knows how to deal with it. Cold starts are nowhere near as difficult as they were with older diesels.

If you know it's going to get real cold, consider adding some PM-23A anti-gel fuel treatment. Fuel stations will have a different blend of winter fuel to avoid gelling but it wouldn't hurt to be doubly sure.
 
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