Lubricity of Gasoline

[dicer]

Is there anyone here that has any specific data on this topic?

 

[drwebb]

There are scads of papers on diesel lubricity but almost none on gasoline. No one seems concerned about it yet. Gasoline is less lubricious by almost any measure than diesel because it is less viscous and contains less sulfur.

 

[WGJ]

Someone must have done something on it to back up the fuel pump work for DI gasoline engines.
It may be worth doing an SAE paper search using Hitchi and Mitsubishi.
Hitachi - manufacturers of DI gasoline pumps
Mitsubishi - had DI engines in the market for a few years now


Bill

 

[WGJ]

Here's afew SAE paper refs:

SAE-962010 Comparison of the lubricity of gasoline and diesel fuels

Alternative fuels 2000
SAE International Fall Fuels and Lubricants Meeting and Exposition (2000: Baltimore, Maryland)

SAE-SP-1551 (COLLECTED PAPERS) Diesel and gasoline performance and additives



Bill

 

[tbuelna]

See ASTM D 4814. It will give you specific physical properties for gasoline.

Unfortunately, "lubricity" is not recognized as an actual property of fuel. You will likely find specific gravity and possibly viscosity defined in ASTM D 4814, as well as allowable sulfur content.

http://www.astm.org/cgi-bin/SoftCart.exe/DATABASE.CART/REDLINE_PAGES/D4814.htm?E+mystore

 

[amorrison]

OT a bit.

Q. Why is diesel fuel a lubricant and gasoline not?

Ans. The carbon chain of diesel is long enough to "ball up" while the shorter chain of gasoline remains "straight" providing little lubrication.

 

[dcasto]

I'm going to take a stab. If you google lubrication and surface tension you will see a relationship. I see a trend too in the physical properties tables of C5 vs C12 (gasoline vs disel).