Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-14-2009, 12:12 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,177
Cetane Boost

After reading how Euroe has high cetane diesel, I was wondering...

...how can we boost cetane, besides the expensive Over the Counter stuff and without messing with the lubricity of the ULSD?

Also what is the Cetane rating on RUG? Is there a mathmatic formula? I already know RUG is 87 octane.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
Reply With Quote
  #2  
Old 01-14-2009, 12:26 PM
Simpler=Better's Avatar
Ham Shanker
 
Join Date: May 2008
Location: Baltimore, MD
Posts: 2,544
You can't change the fuel easily, but you can filter it properly. Adding a larger filter(Balwin something something) with an integrated water separator has yielded good results for many.
__________________
$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment
Reply With Quote
  #3  
Old 01-14-2009, 12:32 PM
dieseldan44's Avatar
Registered User
 
Join Date: Nov 2006
Location: Boston
Posts: 2,042
I have been told many times biodiesel has a cetane rating in the 50's. Im sure someone has the data to back that up.

Maybe commercial bio to raise the cetane rating? A 50/50 blend would have a cetane in the high forties, getting closer to EU standards. I think it would be cheaper than the equivalent boost using power service, etc.

dd
__________________
-------------------------------
'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
Reply With Quote
  #4  
Old 01-14-2009, 12:33 PM
tyl604's Avatar
Registered User
 
Join Date: Feb 2008
Location: Atlanta, GA
Posts: 3,638
I have been using a cetane boost, smoke reducing product (3 oz per tankful) for about a year. Think it does reduce the smoke some but really cannot feel any uptake in pickup. Buy it at Pep Boys. '81 300SD
Reply With Quote
  #5  
Old 01-14-2009, 12:33 PM
LUVMBDiesels's Avatar
Dead on balls accurate...
 
Join Date: Aug 2006
Location: Red Lion,Pa
Posts: 2,207
Run a blend of BioDiesel. Even B2 has better cetane than regular ULSD.
__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad
Reply With Quote
  #6  
Old 01-14-2009, 12:41 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,177
If Bio-D has a higher Cetane rating, why does it put out 10% less BTU's?

I have used B100 and noticed the drop in performance.

I know bio-D does have better lubricity.
__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
Reply With Quote
  #7  
Old 01-14-2009, 12:49 PM
oldsinner111's Avatar
lied to for years
 
Join Date: Nov 2008
Location: Elizabethton, TN
Posts: 6,246
I use turpentine.1 qt. to full tank.Same price as others but natural.Smells good.
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran
Reply With Quote
  #8  
Old 01-14-2009, 12:49 PM
dieseldan44's Avatar
Registered User
 
Join Date: Nov 2006
Location: Boston
Posts: 2,042
From Wikipedia: http://en.wikipedia.org/wiki/Cetane_number

"Cetane number of a fuel is defined as the percentage by volume of normal cetane in a mixture of normal cetane and alpha-methyl naphthalene which has the same ignition characteristics (ignition delay) as the test fuel when combustion is carried out in a standard engine under specified operating conditions.

Cetane number is actually a measure of a fuel's ignition delay; the time period between the start of injection and start of combustion (ignition) of the fuel. In a particular diesel engine, higher cetane fuels will have shorter ignition delay periods than lower cetane fuels"


and

"Generally, diesel engines run well with a CN from 40 to 55. Fuels with higher cetane number which have shorter ignition delays provide more time for the fuel combustion process to be completed. Hence, higher speed diesels operate more effectively with higher cetane number fuels. There is no performance or emission advantage when the CN is raised past approximately 55; after this point, the fuel's performance hits a plateau. In North America, diesel at the pump can be found in two CN ranges: 38-42 for regular diesel, and 42-45 for premium. Premium diesel may have additives to improve CN and lubricity, detergents to clean the fuel injectors and minimize carbon deposits, water dispersants, and other additives depending on geographical and seasonal needs.

In Europe, diesel cetane numbers were set at a minimum of 38 in 1994 and 40 in 2000. The current standard for diesel sold in European Union, Iceland, Norway and Switzerland is set in EN 590, with a minimum cetane index of 46.

Dimethyl ether may prove advantageous as a future diesel fuel as it has a high cetane rating (55) and can be produced as a biofuel.[1][2]

Alkyl nitrates (principally 2-ethyl hexyl nitrate [1]) and di-tert-butyl peroxide are used as additives to raise the cetane number.

Biodiesel from vegetable oil sources have been recorded as having a cetane number range of 46 to 52, and animal-fat based biodiesels cetane numbers range from 56 to 60.[3]"

It sets the ignition delay, it seems to not be directly related to BTU content.
__________________
-------------------------------
'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
Reply With Quote
  #9  
Old 01-14-2009, 12:52 PM
JCSC2's Avatar
Registered User
 
Join Date: Jul 2006
Location: Nashville, TN
Posts: 209
Quote:
Originally Posted by tyl604 View Post
I have been using a cetane boost, smoke reducing product (3 oz per tankful) for about a year. Think it does reduce the smoke some but really cannot feel any uptake in pickup. Buy it at Pep Boys. '81 300SD
What product do you use?
Diesel Kleen?
__________________
1985 Mercedes Benz 300SD, TMU
2015 Chrysler 200S
Reply With Quote
  #10  
Old 01-14-2009, 01:10 PM
tyl604's Avatar
Registered User
 
Join Date: Feb 2008
Location: Atlanta, GA
Posts: 3,638
Yes, Diesel Kleen. I am surprised about the comments about low octane; never considered that diesel engines used such low octane fuel.
Attached Thumbnails
Cetane Boost-.jpg0001.jpg  
Reply With Quote
  #11  
Old 01-14-2009, 01:15 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,177
Dimethyl ether, alkyl nitrates (principally 2-ethyl hexyl nitrate [1]) and di-tert-butyl peroxide...

What are these compounds in layman's terms?

What is turpintine's classification in the above chemical names? I use turpintine to get oil based paint out of paint brushes.

So far, all the info provided is enlightening.
__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
Reply With Quote
  #12  
Old 01-14-2009, 01:39 PM
JCSC2's Avatar
Registered User
 
Join Date: Jul 2006
Location: Nashville, TN
Posts: 209
Quote:
Originally Posted by tyl604 View Post
Yes, Diesel Kleen. I am surprised about the comments about low octane; never considered that diesel engines used such low octane fuel.
Thanks, been looking at that product each time I'm in the auto parts store.
__________________
1985 Mercedes Benz 300SD, TMU
2015 Chrysler 200S
Reply With Quote
  #13  
Old 01-14-2009, 02:21 PM
LUVMBDiesels's Avatar
Dead on balls accurate...
 
Join Date: Aug 2006
Location: Red Lion,Pa
Posts: 2,207
Quote:
Originally Posted by tyl604 View Post
Yes, Diesel Kleen. I am surprised about the comments about low octane; never considered that diesel engines used such low octane fuel.

Octane is the resistance to burning. You want a low octane fuel for a Diesel since you have no spark to ignite the fuel.

I used Diesel Kleen for a long time. I found that pouring some B100 into a full tank of D2 works just as well. It is also cheaper.

I went back to DK when the temps dropped below 40.

I also look for so called premium Diesel with a Cetane of at least 45 when I can find it. My local Gulf station sells it for the same price as 40 Cetane fuel goes for at the Mobil station across the street.
__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad
Reply With Quote
  #14  
Old 01-14-2009, 02:22 PM
NoSparkNeeded's Avatar
Registered User
 
Join Date: May 2008
Location: Northern California
Posts: 509
Homemade additive perhaps?

I usually put some Redline catalyst in every other tank. Anyone know if
you can buy the chemical equivalent of that stuff in bulk? 7 bucks a bottle
for stuff that probably costs a quarter is a bit much. Has anyone come up
with a homebrew that will increase the cetane and the lubricity of LSD to
at least Euro standards, on the cheap? I see someone mentioned a little turpentine. Is that true?
__________________
85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson
Reply With Quote
  #15  
Old 01-14-2009, 02:41 PM
Registered User
 
Join Date: Nov 2008
Location: San Francisco Bay Area, California
Posts: 231
Go to the nearest truck stop

If you live near the interstate,check out the large selection of additives available at your nearest truck stop.The stuff I get in a 32oz bottle costs 11$ and treats about 250 gal. of fuel(ratio 1oz to 7-8 gallons)
It says overuse isn't harmful,and if I mix it at twice the recommended amount I do feel a performance difference.My engine has 285K miles though and a lot of blowby.I'm probably just making up for the toll of time/mileage with the additive!
It's made by Howes labs and called meaner cleaner.They also make a winter fuel conditioner.
I tried the Redline product but didn't see any performance difference.I agree it is a bit expensive.Our older diesels WERE NOT designed for ULSD.I would run some additive to improve lubrication at the very least.The Howes product is soy oil based.
And Di-Methel ester is what is commonly known as "bio-diesel"

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 07:41 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page