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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.
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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 |
#2
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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.
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
#3
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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
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------------------------------- '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 |
#4
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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
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#5
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Run a blend of BioDiesel. Even B2 has better cetane than regular ULSD.
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"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 |
#6
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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.
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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 |
#7
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I use turpentine.1 qt. to full tank.Same price as others but natural.Smells good.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#8
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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.
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------------------------------- '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 |
#9
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Quote:
Diesel Kleen?
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1985 Mercedes Benz 300SD, TMU 2015 Chrysler 200S |
#10
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Yes, Diesel Kleen. I am surprised about the comments about low octane; never considered that diesel engines used such low octane fuel.
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#11
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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.
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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 |
#12
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Thanks, been looking at that product each time I'm in the auto parts store.
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1985 Mercedes Benz 300SD, TMU 2015 Chrysler 200S |
#13
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Quote:
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.
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"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 |
#14
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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?
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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 |
#15
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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" |
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