FUEL ADDITIVES/OCTANE BOOSTERS
04-29-2002, 08:12 PM
#1
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FUEL ADDITIVES/OCTANE BOOSTERS
Anyone had any luck on fule additives or octane boosters?
Anyone heard of a fuel additive called "alinine" ? <img src="confused.gif" border="0">
Anyone heard of a fuel additive called "alinine" ? <img src="confused.gif" border="0">
04-29-2002, 08:44 PM
#2
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The main stuff I heard mentioned around here is toluene. Check out <a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=15&t=006023" target="_blank">this</a> thread and if you do a search on that board it was discussed before.
04-29-2002, 10:50 PM
#3
I am on my second tank of tolulene assisted octane. I am running a mix of 1 gallon of tolulene to around 7 gallons of 91 octane. (2 gallons of tolulene per tank) It makes for an expensive fill-up, but so far seems worth it.
So far my impression is that it does work as advertised. Its not like I stuck a V8 in there, but it is a noticable change. I get faster revs, more response off the line, and the whole engine seems to run a bit smoother.
If you can find higher octane gas (93+) then it might not be a big help, but locally 91 is the top rating, and the tolulene seems to really help.
So far my impression is that it does work as advertised. Its not like I stuck a V8 in there, but it is a noticable change. I get faster revs, more response off the line, and the whole engine seems to run a bit smoother.
If you can find higher octane gas (93+) then it might not be a big help, but locally 91 is the top rating, and the tolulene seems to really help.
04-30-2002, 02:09 AM
#4
Race Director
Increasing octane will not give you more power!!! There are just about as many hydrogen and carbon atoms per gallone of toluene as in gasoline and the energy liberated per combustion stroke is exactly the same!
What increasing octane does for you is to give you more knock/detonation overhead. This allows you to turn up the boost and increase the ignition advance. THAT is what provides the increased power.
What increasing octane does for you is to give you more knock/detonation overhead. This allows you to turn up the boost and increase the ignition advance. THAT is what provides the increased power.
04-30-2002, 02:49 AM
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Actually Toluene does have about 15% more BTU/gallon than gasoline, and about 20% more than oxygenated gas. That w/o any additional ignition advance will give more power. W/ additional ignition advance the gains can be even greater...
BTU content of gas:
<a href="http://www.epa.gov/otaq/rfgecon.htm" target="_blank">http://www.epa.gov/otaq/rfgecon.htm</a>
BTU content of Toluene (and a bunch of others)
<a href="http://www.venuspetrochem.com/propchem.htm" target="_blank">http://www.venuspetrochem.com/propchem.htm</a>
BTU content of gas:
<a href="http://www.epa.gov/otaq/rfgecon.htm" target="_blank">http://www.epa.gov/otaq/rfgecon.htm</a>
BTU content of Toluene (and a bunch of others)
<a href="http://www.venuspetrochem.com/propchem.htm" target="_blank">http://www.venuspetrochem.com/propchem.htm</a>
04-30-2002, 03:21 AM
#6
Race Director
Yes, but the limiting factor is still the number of oxygen molecules you have in the combustion chamber. To obtain a correct air-fuel ratio using additional toluene, you must lean out your mixture. With the most ideal 12.5:1 power-producing air-fuel ratio, you will still have exactly the same number of hydrocarbons in your combustion chamber as before...
Sorry, I should've worded it this way before...
Sorry, I should've worded it this way before...
04-30-2002, 11:01 PM
#7
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Anybody know of a volumetric efficiency study done of high octane with toluene (or any other additive) v lower octane regular gas? Just curious since the vapor point for toluene is higher, then a leaner mix to get the 12.5:1 should result in less mass being accelerated into the combustion chamber. Then again, this might be just splitting hairs.
In regards to additives, check out Danno's site, and do a search for a thread using the words- rocket fuel. We went over this at some length a while back.
Dave
In regards to additives, check out Danno's site, and do a search for a thread using the words- rocket fuel. We went over this at some length a while back.
Dave
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05-01-2002, 04:34 AM
#8
Race Director
"Just curious since the vapor point for toluene is higher, then a leaner mix to get the 12.5:1 should result in less mass being accelerated into the combustion chamber. "
Well the injectors are aimed straight into the combustion chamber and they are volume devices. That is, they open a certain amount to meter a certain volume of fuel. However, this fuel is denser, so an equal volume of fuel would have more mass going into the combustion chamber. But, you've only got so much oxygen pushed in by the turbo, so you'll have too much mass of fuel compared to air. Thus the too-rich mixture.
This is why a lot of people will tell you that you need to re-jet to lean-out your carbs or re-program your fuel-injection if you use all race-fuel. That's because it contains close to 50% toluene and other aromatics. Thus throwing off your air-fuel mixture...
Well the injectors are aimed straight into the combustion chamber and they are volume devices. That is, they open a certain amount to meter a certain volume of fuel. However, this fuel is denser, so an equal volume of fuel would have more mass going into the combustion chamber. But, you've only got so much oxygen pushed in by the turbo, so you'll have too much mass of fuel compared to air. Thus the too-rich mixture.
This is why a lot of people will tell you that you need to re-jet to lean-out your carbs or re-program your fuel-injection if you use all race-fuel. That's because it contains close to 50% toluene and other aromatics. Thus throwing off your air-fuel mixture...
05-01-2002, 05:58 PM
#9
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Danno
It would seem to me that if you need to richen the mixture in this case, you could always add more toluene since the injectors meter fuel based on fluid volume. Since your 951 isn't anywhere near stock, what did you do about your mixture control? Is it an issue with a mildly modified 951 ie- chips, exhaust, LBE?
BTW- check your private messages.
Dave
It would seem to me that if you need to richen the mixture in this case, you could always add more toluene since the injectors meter fuel based on fluid volume. Since your 951 isn't anywhere near stock, what did you do about your mixture control? Is it an issue with a mildly modified 951 ie- chips, exhaust, LBE?
BTW- check your private messages.
Dave
