Xylene Fuel Additive
Xylene Fuel Additive
(OP)
I have been reading the threads and I have access to un limited amounts of xylene. What would the ratio be per gallon to mix. It is going in a race engine and it has no pollution controllc on it.
Thanx,
Zmann
Thanx,
Zmann





RE: Xylene Fuel Additive
Shaun TiedeULTRADYNE Arl,TX(stiede@ev1.net)
RE: Xylene Fuel Additive
hydrocarbon) is usually limited to about 30% maximum
for current USA street legal gasoline but a mixture of
70% toluene, 30% heptane has been successfully used as F1
racing fuel but not without fuel line heaters. Toluene
and xylene are very siumilar.
Depending on your racing application, you may find that
too much xylene (or total aromatic content) produces
excessive soot especially when running rich and may
create cold start problems in cooler climates.
http://www.atsdr.cdc.gov/toxprofiles/tp71-c3.pdf
http://www.atsdr.cdc.gov/toxprofiles/tp56-c3.pdf
http://www.atsdr.cdc.gov/toxprofiles/tp72-c3.pdf
See the above links for more chemical information on
xylene, toluene, and an obsolete general recipe (1990)
for blending street legal gasoline.
Without knowing the total aromatic content of the gasoline
you use plan on using for blending, and its initial rated
octane, its difficult to guess on an acceptable mix ratio.
Trial and error is the only way. I'd start at about 5%
additional xylene and see what happens with the idea that
adding as little as possible to achieve the desired octane
is the best plan.
Hope this helps,
Chumley
RE: Xylene Fuel Additive
What are the fuel line heaters for? Toluene should be smack in the middle of most gasoline's distillation curve.
RE: Xylene Fuel Additive
During this time of high aromatic content, fuel line heaters were often employed to improve the vapor-air ratio during high RPM operation. Since FIA regulations call for rubber fuel bladders, it was neither safe (nor practical) to heat the fuel in-tank. As far as I know, no team is still making use of heated fuel lines.
Back to the original question…
Ideally you would mix the minimum amount of xylene (or any other octane enhancing agent) required to prevent detonation under operating conditions. There is no performance benefit to be gained from using fuels with excessive octane ratings.
There are no reliable formulae available for predicting the resultant octane rating of mixing xylene with pump gas. You may see websites for do-it-yourself race gas that state “mixing X parts of xylene with Y parts of pump gas will get you Z octane…”. To put it bluntly, these sites are wrong. Gasoline manufacturers each have their own proprietary blends for the various grades of pump gasoline. The pump gas you purchase already contains some quantity of toluene and xylene. Since you have no way of knowing the specific blend in question, you cannot accurately predict the resulting octane rating.
From personal experience, I would advise sticking with commercially available race gas. Regardless of how cheaply you can acquire xylene.
Good Luck,
Bryan Carter
RE: Xylene Fuel Additive
"Toluene should be smack in the middle of most gasoline's
distillation curve."
The aromatics are the higher boiling point fractions of
gasoline. See the attached link for some common boiling
points and their RON and MON blending octanes. They are
listed as BP in °C in the chart in section 4.13.
http://blizzard.rwic.und.edu/~nordlie/cars/gasoline.html
As I understood it, the fuel line heaters were to keep
the fuel warm enough to obtain good vaporization
characteristics since the boiling points are so high.
(I'm not an F1 racer!)
Hope this helps,
Chumley
RE: Xylene Fuel Additive
RE: Xylene Fuel Additive
parenthesis right above the reference to dicyclopentadiene,
it does say that it isn't normally present in significant
amounts in gasoline! Now I don't wonder why. The link I
posted isn't the ultimate source. Like money, those aren't
normally given away for free at an anonymous persons
request with no possible future potential for profit.
Heir Dr.: We're all just learning. No regrets necessary!
Do you have any idea where I can download a program that
will take back all the shit I wish I never said or wrote?
Naahhh! Don't need it. I learn more when I screw up!
Hope this helps!
Chumley