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Lubricity in Diesel Fuel

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Tom43

03-01-2007 07:34:43

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Dear Petroleum Engineers,

What is the best additive to ensure proper lubricity in todays fuel? What proportion do you advise?

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JaredM

03-01-2007 17:51:41

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Re: Lubricity in Diesel Fuel in reply to Tom43, 03-01-2007 07:34:43

If my memory serves me right, B20 is 60% more lubricative than straight diesel. Jared

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BobHnwOh

03-01-2007 15:07:46

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Re: Lubricity in Diesel Fuel in reply to Tom43, 03-01-2007 07:34:43

I use 1 qt.Marvel Mystery Oil to 50 gal.diesel in my AC 7060,runs smooth as silk,cuts varnish,Bob.

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Billpa

03-01-2007 14:17:44

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Re: Lubricity in Diesel Fuel in reply to Tom43, 03-01-2007 07:34:43

Tom
I am not a petro enginere but here goes I put out door two cycle oil in my fuel (Cummins) Dodge 95 w250,000 on it and havent touched injectors or injector pump still going strong

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Jerry/MT

03-01-2007 11:53:21

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Re: Lubricity in Diesel Fuel in reply to Tom43, 03-01-2007 07:34:43

it's my understandig that the lubricity components are addedback to the fuel all ready. The process that takes the Sulphur out of the fuel is responsible for the lack of lubricity ( not the reduction of elemental Sulphur)and the refiners add lubricity additives to the fuel. It's kinda "belt and suspenders" to add more additive, but your $'s, your choice.

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jdemaris

03-01-2007 09:13:28

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Re: Lubricity in Diesel Fuel in reply to Tom43, 03-01-2007 07:34:43

I'm not a petro-engineer - so not sure if I'm qualified to answer. But, I do read test results a bit.

If you're concerned, why not just pick an additive that has been tested and proven to work?
The US Military, Stanadyne, CAV, Power Service, etc. all have published test results - along with info on how much to add per gallon.

And, if you want an organic additive - here are a few:

Canola oil (LEAR or Low Erucic Acid Rapeseed) - visc at 40 degrees C = 37, Cetane -
40-50
Castor oil - visc at 40 degrees C = 297
Corn oil - visc at 40 degrees C = 35
Cotton-seed oil - visc at 40 degrees C = 33.5
Crambe oil (Abyssinian Mustard)- visc at 40 degrees C = 53.6
Linseed oil - visc at 40 degrees C = 27.2
Peanut oil - visc at 40 degrees C = 39.6
Rapeseed oil - visc at 40 degrees C = 37
Safflower oil - visc at 40 degrees C = 31.3
High-oleic Safflower oil - visc at 40 degrees C = 41.2
Sessame oil - visc at 40 degrees C = 35.5
Soybean oil - visc at 40 degrees C = 32.6
Sunflower oil - visc at 40 degrees C = 37.1
Tallow oil - visc at 40 degrees C = 51.1
Certified Biodiesel ASTM D-6751 - visc at 40 degrees C = 1.9 - 6 , Cetane - 45-65

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John in Ct

03-01-2007 09:38:55

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Re: Lubricity in Diesel Fuel in reply to jdemaris, 03-01-2007 09:13:28

I use Standadyne. My question is, is it better to error more on the high side when adding the additive( Put a little extra in) or should I error on the low side? Thanks!!!

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jdemaris

03-01-2007 10:57:26

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Re: Lubricity in Diesel Fuel in reply to John in Ct, 03-01-2007 09:38:55

You can't put too much in - it's just a matter of cost - and perhaps not wanting to waste your money. There is a point, where any extra does not demonstrate any gain in durability. Personally, I trust (more-or-less) Stanadyne simply because they make most of the rotary injection pumps in the US (along with roller-lifters and Moen faucets). And, the company was responsible for the first sucessful rotary fuel-injection pump ever made (by old man Vernon Roosa). The CAVs were created from the Stanadyne/Roosamaster design and CAV payed for the rights.

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Allan In NE

03-01-2007 09:03:39

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Re: Lubricity in Diesel Fuel in reply to Tom43, 03-01-2007 07:34:43

Gee Tom,

Ya really know how to shut up a rowdy crowd don't ya? :>)

Allan

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Rich Va

03-01-2007 10:19:06

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Re: Lubricity in Diesel Fuel in reply to Allan In NE, 03-01-2007 09:03:39

Allen I'm gettin more confused. So is Maris saying it's ok to pour some Wesson oil in the tank for lubrication? Is it no trans fat. duh

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Allan In NE

03-01-2007 12:19:03

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Re: Lubricity in Diesel Fuel in reply to Rich Va, 03-01-2007 10:19:06

I dunno, guess I'm totally lost on this subject.

Still trying to choke down the mandatory requirements of not running no-lead fuel in engines not equipped for it, not mixing gasoline and diesel, not mixing R-12 and R-134a and not tearing the tag off the mattress.

I'll get to this little problem sometime in 20 or 30 years. :>)

Allan

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jdemaris

03-01-2007 13:07:06

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Re: Lubricity in Diesel Fuel in reply to Allan In NE, 03-01-2007 12:19:03

I can say this much - for sure. Back when the "unleaded gas scare" came out - late 70s-early 80s sometime (I heard all the gloom and doom and was buying lead-additive to dump into my 64 Chevelle SS, and my 69 Dodge Powerwagon. I still use the 69 Powerwagon as a farm-truck - and gave up many years ago worrying about hurting it. In fact, sometimes I wish it'd die. It still runs fine - I guess the 318 V-8 is one of the good things Dodge did -and the unleaded fuel never hurt it a bit. The rotary injection pumps thing is different. By the nature of the compact design, and no sump for oil, it needs all the help than can get.

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jdemaris

03-01-2007 11:08:35

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Re: Lubricity in Diesel Fuel in reply to Rich Va, 03-01-2007 10:19:06

Do you know what's in your Wesson oil? I don't - but I can't say I ever tried to find out.

I suppose people who run their diesels on pure waste deep-fry oil (WVO) ought to start thinking about the low - or no trans-fat changes going on.

But, many companies have been looking for crop-produced-oils that can be added to diesel fuel boost its lubricostity.

There are many oils from plants, seeds, etc. that work fine as lube-ehancers. But, some also gel up pretty easy in cold weather. So, again - I prefer to rely on test results - rather then trial and error.

All this under the pretense of being more environmentally friendy. They seem to skip over the part of how much petroleum is used to grow crops - via diesel fuel in tractors, petro in fertizers, herbicides, pesticides, etc.

But, many oils produced from crops do a good job of enhancing the lubricostiy of diesel fuel. Overseas - canola oil is commonly used. Here ? I think most companies are using sythetic or engineered supplements - unless you are buying preblended biofuel.

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