Diesel Noise Question
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Mountain Pass
Joined: Aug 2018
Posts: 221
Likes: 8
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!
Mountain Pass
Joined: Sep 2017
Posts: 138
Likes: 11
From: The Woodlands
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.
Logistics Pro
Joined: Feb 2005
Posts: 3,529
Likes: 390
From: SEVA
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."
Mountain Pass
Joined: Oct 2007
Posts: 180
Likes: 8
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.
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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Mountain Pass
Joined: Aug 2018
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[QUOTE=MPawelek;18191852]
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.
No one has mentioned that some of us are getting older and the hearing is going South, thus quieter diesels. 
[/QUOTEBest 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.
Hotshot
Joined: Oct 2015
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From: Wyoming
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.