archer wrote:
>> Sulfur is NOT a lubricant (where did you get that idea?). When sulfur is
>> removed from the diesel fraction of crude by most usual methods it also
>> remove the fractions that are the best lubricants. These CAN be
>> replaced, but until forced to, most refiners didn't.
>> Marshall
> ------------------------------
> Does that mean that that the current low sulphur fuel does not have to have
> lubricant added if used in a VW diesel with rotary pump?
> Gerry
The people that make their living selling additives will tell you
otherwise, but additives should not need to be added to fuel if the pump
is properly designed.
The lubricity standards for ULSD are sufficient for all diesel engines
recently or currently sold in the US (and MOST that were here before).
Now if your 20+ year old VW or Volvo diesel pumps are on their last
legs, they are likely to fail sometime shortly after you change them
over to ULSD. Had you NOT change them over, they might have lasted
longer - or they might not! The old pumps were designed for the
lubricity blended into 0.5 sulfur fuel and some even tolerated 0.05%.
USLD has better lubricity than 0.5.
All of the Bosch/Mercedes pumps were inline pumps, lubricated by engine
oil and could run on kerosene, standard #2 and everything in between.
They were not essentially different than the pumps that served the early
('60s thru 'early '70s) Mercedes injected gasoline engines.
http://www.chevron.com/products/prodserv/fuels/diesel/ulsd.shtml#A2
http://fleetowner.com/mag/fleet_abcs_ulsd/
http://www.clean-diesel.org/faqs.html
Marshall
--
Marshall Booth Ph.D.
Ass't Prof. (ret.)
Univ of Pittsburgh School of Medicine
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