New question about octane boosters
----snake bitten----
Joined: Apr 2005
Posts: 852
Likes: 0
From: midland tx
Originally Posted by ATI Performance
I'm glad to hear somebody took the time to send a fuel sample to a lab and get it tested. I am surprised as it is unusual to hear of that being done, given all the other crap on the shelf at Autozone, etc.
Torco sounds like concentrated MMT and/or MTBE...
FYI here is some info on avgas (with references to Toluene):
http://www.chevrontexacoaviation.com...ech_Review.pdf
As long as Torco is solving knock problems for boosted cars, more power to it.
Bob
Torco sounds like concentrated MMT and/or MTBE...
FYI here is some info on avgas (with references to Toluene):
http://www.chevrontexacoaviation.com...ech_Review.pdf
As long as Torco is solving knock problems for boosted cars, more power to it.
Bob
Tech Contributor
Joined: Jun 2004
Posts: 20,857
Likes: 959
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Originally Posted by Formula Outlaw
Remember: the higher the octane, the SLOWER the burn rate, so in many instances, especially in hot cammed cars like my 65' L76, the entire mixture will not complete ignition before the exhaust valve is opened and forces unburned fuel out the exhaust.
Regarding unburned fuel out the exhaust, the only thing that makes sense to me is that with a wild cam there is going to be a non-uniform air mixture going into the cylinders caused by residual exhaust gas getting sucked into the intake manifold during overlap periods. This residual exhaust gas will generally slow the burn rate (hence the need to add "EGR Spark Advance" in modern computer controlled vehicles to maintain torque and driveability) and may be the cause of the high exhaust temps, assuming your carb wasn't also jetted lean at idle.
Just my thoughts.
Melting Slicks
Joined: Feb 2001
Posts: 2,137
Likes: 1
From: Oklahoma City OK
Cruise-In III Veteran
"Higher octane burns slower" is an old wives tale.
>>Popular Hot Rodding Magazine, January 1998
By Scott Parkhurst
"The burn rate of a fuel is a measurement of the time required for complete combustion of the air/fuel mixture. The notion that octane ratings affect the burn rate of fuel is about 180-degrees from reality. Burn rate is a function of several variables, and the two are completely independent, although there is generally a correlation between higher octane ratings and faster burn rates.
To give you a good example of this, we contacted Jim Wurth from Sunoco Race Fuels. He explains, "A perfect example is Sunoco Maximal, which is our fastest burning fuel, and coincidentally one of Sunoco's highest octane fuels at 116 (R+M) / 2. A lot of Pro Stock teams rely on Maximal for those sub-seven second runs. When they are turning 9,000 rpm or more, the fuel has to burn pretty quickly to achieve complete combustion".<<
>>Popular Hot Rodding Magazine, January 1998
By Scott Parkhurst
"The burn rate of a fuel is a measurement of the time required for complete combustion of the air/fuel mixture. The notion that octane ratings affect the burn rate of fuel is about 180-degrees from reality. Burn rate is a function of several variables, and the two are completely independent, although there is generally a correlation between higher octane ratings and faster burn rates.
To give you a good example of this, we contacted Jim Wurth from Sunoco Race Fuels. He explains, "A perfect example is Sunoco Maximal, which is our fastest burning fuel, and coincidentally one of Sunoco's highest octane fuels at 116 (R+M) / 2. A lot of Pro Stock teams rely on Maximal for those sub-seven second runs. When they are turning 9,000 rpm or more, the fuel has to burn pretty quickly to achieve complete combustion".<<
Tech Contributor
Joined: Jun 2004
Posts: 20,857
Likes: 959
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Originally Posted by FRISKY
"Higher octane burns slower" is an old wives tale.
>>Popular Hot Rodding Magazine, January 1998
By Scott Parkhurst
"The burn rate of a fuel is a measurement of the time required for complete combustion of the air/fuel mixture. The notion that octane ratings affect the burn rate of fuel is about 180-degrees from reality. Burn rate is a function of several variables, and the two are completely independent, although there is generally a correlation between higher octane ratings and faster burn rates.
To give you a good example of this, we contacted Jim Wurth from Sunoco Race Fuels. He explains, "A perfect example is Sunoco Maximal, which is our fastest burning fuel, and coincidentally one of Sunoco's highest octane fuels at 116 (R+M) / 2. A lot of Pro Stock teams rely on Maximal for those sub-seven second runs. When they are turning 9,000 rpm or more, the fuel has to burn pretty quickly to achieve complete combustion".<<
>>Popular Hot Rodding Magazine, January 1998
By Scott Parkhurst
"The burn rate of a fuel is a measurement of the time required for complete combustion of the air/fuel mixture. The notion that octane ratings affect the burn rate of fuel is about 180-degrees from reality. Burn rate is a function of several variables, and the two are completely independent, although there is generally a correlation between higher octane ratings and faster burn rates.
To give you a good example of this, we contacted Jim Wurth from Sunoco Race Fuels. He explains, "A perfect example is Sunoco Maximal, which is our fastest burning fuel, and coincidentally one of Sunoco's highest octane fuels at 116 (R+M) / 2. A lot of Pro Stock teams rely on Maximal for those sub-seven second runs. When they are turning 9,000 rpm or more, the fuel has to burn pretty quickly to achieve complete combustion".<<
