10% xylene in 91 pump gas = octane rating?
01-04-2009, 05:27 PM
#2
It depends on the volume used of each but for 10%.
Put 19 gallons of 91 octane and 2 gallons of Xylene (117 octane) in the tank. This will give a fuel mix of 93.5 octane.
Here is the calculation:
(19 gallons X 91 octane) + (2 gallons X 117 octane) / 21 total gallons = 93.5 octane
If you use only 1 gallon of xylene:
(20 gallons X 91 octane) + (1 gallons X 117 octane) / 21 total gallons = 92.2 octane
Put 19 gallons of 91 octane and 2 gallons of Xylene (117 octane) in the tank. This will give a fuel mix of 93.5 octane.
Here is the calculation:
(19 gallons X 91 octane) + (2 gallons X 117 octane) / 21 total gallons = 93.5 octane
If you use only 1 gallon of xylene:
(20 gallons X 91 octane) + (1 gallons X 117 octane) / 21 total gallons = 92.2 octane
Thanks
01-04-2009, 09:07 PM
#5
Nordschleife Master
It depends on the volume used of each but for 10%.
Put 19 gallons of 91 octane and 2 gallons of Xylene (117 octane) in the tank. This will give a fuel mix of 93.5 octane.
Here is the calculation:
(19 gallons X 91 octane) + (2 gallons X 117 octane) / 21 total gallons = 93.5 octane
If you use only 1 gallon of xylene:
(20 gallons X 91 octane) + (1 gallons X 117 octane) / 21 total gallons = 92.2 octane
Put 19 gallons of 91 octane and 2 gallons of Xylene (117 octane) in the tank. This will give a fuel mix of 93.5 octane.
Here is the calculation:
(19 gallons X 91 octane) + (2 gallons X 117 octane) / 21 total gallons = 93.5 octane
If you use only 1 gallon of xylene:
(20 gallons X 91 octane) + (1 gallons X 117 octane) / 21 total gallons = 92.2 octane
anywhere other than the northeast or california
01-05-2009, 04:29 AM
#7
RL Community Team
Rennlist Member
Rennlist Member
21 gallons? Does a 944 hold that much? My 944 only takes about 14 gallons...
Don't run Xylene on smog day, but it's fine for the other 51 weeks!
Don't run Xylene on smog day, but it's fine for the other 51 weeks!
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01-05-2009, 09:45 AM
#8
Three Wheelin'
01-05-2009, 12:16 PM
#10
Three Wheelin'
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you will need to increase your fuel pressure ...like 10% as xylene is not as effective at atomizing as gas....but if you have a turbo car you can crank the boost up big
01-05-2009, 10:29 PM
#11
Three Wheelin'
Thread Starter
HEY!! I'm amazed in the difference...with approx. 2-3 gals left in the tank I added 1 gal. of xylene with 10 more gal. of 91 octane, effectively/theoretically boosting the rating to 93 octane. Though the octane rating only went up 2 points, it seemed to spool up faster and had better throttle response.
This could get habit forming...
This could get habit forming...
01-06-2009, 01:05 AM
#14
Three Wheelin'
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Northeast dosnt have emmisions restrictions on cars 20 years old. And new this year in MA any car without OBDII, 96 or older, only have to have a safety inspection.
Got my Xlyene at home depot to aid in the glue removal when I stripped my interior.
Got my Xlyene at home depot to aid in the glue removal when I stripped my interior.
01-06-2009, 02:51 AM
#15
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I'm not so sure the math is quite that simple...mainly because it's chemistry, not math.
But...for arguments sake, lets say you ended up with 93 octane. Octane isn't a measure of energy/performance. Octane merely reduces the tendency to knock. Higher octane gasoline actually has less energy, but the knock resistance allows more timing and/or more boost. Unless you (or the engine itself) re-tuned to make use of the higher octane, there should be a slight reduction in peformance/mileage. It's likely too slight to measure outside of a lab. I don't think our engines are sophisiticated enough to run the hairy edge of detonation via computer (knock sensor) control.
This isn't to say there can't be performance gains with xylene, but it isn't the octane increase. It may well be acting as an oxydizer along the lines of N2O2.
But...for arguments sake, lets say you ended up with 93 octane. Octane isn't a measure of energy/performance. Octane merely reduces the tendency to knock. Higher octane gasoline actually has less energy, but the knock resistance allows more timing and/or more boost. Unless you (or the engine itself) re-tuned to make use of the higher octane, there should be a slight reduction in peformance/mileage. It's likely too slight to measure outside of a lab. I don't think our engines are sophisiticated enough to run the hairy edge of detonation via computer (knock sensor) control.
This isn't to say there can't be performance gains with xylene, but it isn't the octane increase. It may well be acting as an oxydizer along the lines of N2O2.