EPDM Coatings
rvupgradestore.com Composet Products Custom Yacht Interiors

Author Topic: Engine noise on Fraightliner Diesel  (Read 3223 times)

Royal

  • Posts: 2
Engine noise on Fraightliner Diesel
« on: February 14, 2012, 07:09:01 AM »
I am leaving in two days to St Louis to purchase a Leisure Travel class B diesel Mercedes. My wife is concerned about the noise inside the cab while we are driving.  We drove a Ford Pleasure Way on a test drive and she felt it was too loud for her. Is the diesel any quieter?

Gary RV_Wizard

  • Forum Staff
  • ---
  • *
  • Posts: 61037
  • RVer Emeritus
Re: Engine noise on Fraightliner Diesel
« Reply #1 on: February 14, 2012, 08:04:24 AM »
More likely it will be the same or even a bit noisier. No van chassis is going to be as quiet as a family sedan - you are sitting right on top of the engine.
Gary
--------------
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

Karsty

  • ---
  • Posts: 239
  • Niagara Falls, Ontario CANADA
    • PBASE PHOTO GALLERYS
Re: Engine noise on Fraightliner Diesel
« Reply #2 on: February 14, 2012, 09:18:32 AM »
I am leaving in two days to St Louis to purchase a Leisure Travel class B diesel Mercedes. My wife is concerned about the noise inside the cab while we are driving.  We drove a Ford Pleasure Way on a test drive and she felt it was too loud for her. Is the diesel any quieter?

I can tell you this ... when I purchased my 2012 Winnebago ERA  on the Mercedes/Sprinter chassis in November I was pleasantly surprised at just how quiet it is. It is the 3.0 L diesel which I suspect will be the same as yours. Yes ... it is a little noisier than my Toyota Sienna van ... but when I am sitting at idle with nothing on ... like the radio ... I hardly hear the engine. This engine does not give off the same noise as the older clanking diesels of years ago.

I think your wife can travel in relative peace and quiet.
2012 Winnebago ERA.

“Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do. So throw off the bowlines, sail away from the safe harbour. Catch the trade winds in your sails. Explore. Dream. Discover.” – Mark Twain

Royal

  • Posts: 2
Re: Engine noise on Fraightliner Diesel
« Reply #3 on: February 14, 2012, 09:45:22 AM »
Thank you for your comments. It makes me feel better about my decision.

Roy

Karsty

  • ---
  • Posts: 239
  • Niagara Falls, Ontario CANADA
    • PBASE PHOTO GALLERYS
Re: Engine noise on Fraightliner Diesel
« Reply #4 on: February 14, 2012, 10:30:19 AM »
Thank you for your comments. It makes me feel better about my decision.

Roy

Hi Roy ... did you buy new or used. When you get a chance maybe you can post some pictures and/or provide some info on your class B. I posted some information in this thread: http://www.rvforum.net/SMF_forum/index.php?topic=4697.60 ... but few have posted much information.

Happy travels with you Class B.

Karsty
2012 Winnebago ERA.

“Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do. So throw off the bowlines, sail away from the safe harbour. Catch the trade winds in your sails. Explore. Dream. Discover.” – Mark Twain

pickettt

  • ---
  • Posts: 14
Re: Engine noise on Fraightliner Diesel
« Reply #5 on: February 14, 2012, 11:30:45 PM »
Roy, please tell your wife she hurt my feelings comparing a Ford to a Mercedes.  You'll both be pleasantly surprised at how quiet the diesel is.

skyking1

  • ---
  • Posts: 833
Re: Engine noise on Fraightliner Diesel
« Reply #6 on: February 15, 2012, 07:58:18 AM »
The newer diesel engines have several injection events per cycle, which reduces the noise dramatically. My old engine has one big BANG and you can sure tell the difference.
Kelly and Mary

1996 Dodge CTD 2500 "Woody"
1991 Avion 29.5 ST
Washington State

http://boondockerswelcome.com/users/skyking

keith g

  • ---
  • Posts: 62
Re: Engine noise on Fraightliner Diesel
« Reply #7 on: February 26, 2012, 08:36:16 PM »
Skyking.........your engine might have one big bang....but its a damn sight easier to work on or fix......

Gary RV_Wizard

  • Forum Staff
  • ---
  • *
  • Posts: 61037
  • RVer Emeritus
Re: Engine noise on Fraightliner Diesel
« Reply #8 on: February 27, 2012, 12:11:45 PM »
Quote
The newer diesel engines have several injection events per cycle,

Could you explain that further? It seems to me the engine is either a 2 cycle or a 4 cycle and has the corresponding number of "events" whether the engine is newer or older. Old Detroit diesels were two cycle design and fired every revolution, but they don't make those any more. All the others have always been 4 cycle designs and they fire every other revolution. Even if the fuel is injected in stages, there is still only one "bang".
Gary
--------------
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

skyking1

  • ---
  • Posts: 833
Re: Engine noise on Fraightliner Diesel
« Reply #9 on: February 27, 2012, 11:06:10 PM »
Sure thing,  Gary.
My mechanical injection engine, and all the older ones build pressure with a plunger pump for each cylinder. Once this pressure reaches a certain threshhold, the injector "Pops" open. This is referred to as the "pop" pressure and is one of the things done at a mechanical injector overhaul.
The injection event continues till the pressure falls below the pop pressure, the injector closes. One event.
On the newer electronically controlled common rail engines, the Rail pressure is constant and available at all injectors, all the time. they are all hooked together, hence the term "common rail".
All the timing is now done electronically. So instead of picking the best average place for all conditions,  IE accelerating, light loads, decelerating, the common rail engine can change both the timing, duration, and even the number of injection events per cycle.
Instead of one big squirt, it can deliver the fuel in three or more distinct pulses, spreading the combustion event out for maximum efficiency.
One of the big things you notice right off is the lack of diesel "rattle" or noisiness. The new cars you can hardly tell are diesel, it is because of this. Noise is just another form of wasted energy.
The 305/555 Cummins Common Rail is a 3 event engine.
Kelly and Mary

1996 Dodge CTD 2500 "Woody"
1991 Avion 29.5 ST
Washington State

http://boondockerswelcome.com/users/skyking

gdoug

  • ---
  • Posts: 35
Re: Engine noise on Fraightliner Diesel
« Reply #10 on: March 01, 2012, 10:04:12 PM »
Now that's interesting, Skyking.  I always wondered where the rattle went.  My Sprinter is really quiet. 
Doug
RT Adventurous 3500

SargeW

  • Forum Staff
  • ---
  • *
  • Posts: 6402
  • Life is better on the road!
Re: Engine noise on Fraightliner Diesel
« Reply #11 on: March 01, 2012, 11:59:13 PM »
Yup, my first 1997 Cummins could shake the tiles off of your roof as I passed by. The 2010 in my MH is amazingly quiet. New software package, new injection timing, and a relocated timing chain all helped to quiet the clatter.  Not much different than gassers for noise these days.
Marty--
2017 Tiffin Allegro Bus 40SP
Cummins ISL 450 HP/Powerglide chassis
Visit our new travel blog! http://www.mytripjournal.com/rvnchickTNG
Support your local Police Officer, Fire Fighter and Military!

 

Hosted by Over The Network