Gasoline used to be made from crude simply. You put the crude in the bottom of
a still, and you got gasoline from a certain level in the tower.
At the top is hydrogen, then on declining levels, heavier molecules through
butane, gasoline, kerosene, diesel, oils down to asphalt tar at the bottom.
Due to a need for gasoline with higher octane without lead additives, they had
to 'reform" some of the heavier molecules. This involves putting the heavier
molecules through a catalytic cracker. This heats the fuel very hot, and
breaks the long chains into smaller ones. Then you put the hydrogen back in
and you get more useful middle sized molecules.
You also get funny molecules that are not very good, and can be corrosive or
otherwise bad.
Not you always got gums in distilled fuel, but this process produces more
funny molecules, so you have different treatments, including ones to remove
the sulfur.
Getting more higher octane gas from the crude and meeting EPA law creates a
Pandora's box of molecules.
Hence, you have some big differences between gas 40 years ago.
JimG
2K 69 NJ
--- On Sun, 9/20/09, RWM (Out of the Office) <RWM@RWMann.com> wrote:
From: RWM (Out of the Office) <RWM@RWMann.com>
Subject: Re: [Roadsters] What is in todays fuel that makes everything gum up?
To: "David Boerst" <dboerst@yahoo.com>
Cc: datsun-roadsters@autox.team.net
Date: Sunday, September 20, 2009, 8:14 AM
Walnuts? ;-)
- Bob Mann, '68 2000 Solex
David Boerst wrote:
> I don't call todays fuel gasoline. When I grew up gasoline was copper/gold
in color. The only thing todays fuel has in common with the color is the
price. My 1600 and Amy's 1966 1600 keep gumming up choke piston wise. Is there
any treatment/additive or polishing of piston to make the choke system stop
from sticking?
-- R.W. Mann & Company, Inc. > Airline Industry Analysis and Consulting
Port Washington, NY 11050 > tel 516-944-0900, fax 516-944-7280
mailto:info@RWMann.com > URL http://www.RWMann.com/
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