Witch's Brew
08-30-2001, 04:27 PM
#1
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Witch's Brew
Hey guys there is an interesting article on the 924 board about mixing toluene w/ gas as a safe & cheap octane booster. Does anyone know if our sharks engine controllers would take advantage of this?
08-31-2001, 02:04 AM
#2
Burning Brakes
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Carlos,
I think the same discussion is on the 944 board as well. It's kinda like bigger fuel injectors - if you have a modified engine that can use more fuel, then they are helpful. If not, it's just $ down the toilette...
If you have advanced your timing (or raised your compression) to the point where your engine management is retarding the ignition on orders from the knock sensors, then it can help. Without ANY mods to your motor, moving your octane beyond the range of the premium at the pump won't help much. It may help SOME, but probably not worth anywhere near the trouble.
Back about 20 years ago, I had a Triumph that had 11.5:1 comp. As leaded premium was going away, Toluene was a cheap way to keep the car running with the right octane level. But that was a hi-comp motor with "engine management" consisting of points, a condensor, and vacuum advance on the distibutor...
Just my 2% of a $Euro...
Greg
I think the same discussion is on the 944 board as well. It's kinda like bigger fuel injectors - if you have a modified engine that can use more fuel, then they are helpful. If not, it's just $ down the toilette...
If you have advanced your timing (or raised your compression) to the point where your engine management is retarding the ignition on orders from the knock sensors, then it can help. Without ANY mods to your motor, moving your octane beyond the range of the premium at the pump won't help much. It may help SOME, but probably not worth anywhere near the trouble.
Back about 20 years ago, I had a Triumph that had 11.5:1 comp. As leaded premium was going away, Toluene was a cheap way to keep the car running with the right octane level. But that was a hi-comp motor with "engine management" consisting of points, a condensor, and vacuum advance on the distibutor...
Just my 2% of a $Euro...
Greg
08-31-2001, 04:45 AM
#3
I would suggest that toluene is not acceptable as a fuel with the EPA.
In addition I would also suggest that it has a different specific gravity, calorific value and may be a different viscosity rating which all affects the combustion of the fuel.
There may be a few other aspects like fuel atomisation and flame probagation rate, fuel air mixture ratio and possible combustion carry over into the exhaust system.
All in all it could add up do harm to your engine as well as to the environment.
As other 928 drivers have commented in the past, the Porsche have designed the engine to burn a fuel that is governed by an international standard, relating to calorific value, octane rating etc and if you do add it to your gas, the short term gain may lead to long term pain especially if you junk you engine.
Tails 1990 S4
In addition I would also suggest that it has a different specific gravity, calorific value and may be a different viscosity rating which all affects the combustion of the fuel.
There may be a few other aspects like fuel atomisation and flame probagation rate, fuel air mixture ratio and possible combustion carry over into the exhaust system.
All in all it could add up do harm to your engine as well as to the environment.
As other 928 drivers have commented in the past, the Porsche have designed the engine to burn a fuel that is governed by an international standard, relating to calorific value, octane rating etc and if you do add it to your gas, the short term gain may lead to long term pain especially if you junk you engine.
Tails 1990 S4