Will C16 race fuel help any?
Registered User
Joined: Mar 1999
Posts: 659
From: Chicago, IL
Go to VP's website, they don't reccomend C16 for N/A setups. They would reccomend C14 which is for high rpm naturally aspirated setups.
They also will ask what your compresssion is.
My total compression with my blower is easily 15:1 so I am running C12 which is 108 octane--- MOTOR octane.
I make 720-746rwhp with it.
They also will ask what your compresssion is.
My total compression with my blower is easily 15:1 so I am running C12 which is 108 octane--- MOTOR octane.
I make 720-746rwhp with it.
Registered User
Joined: Sep 2000
Posts: 3,223
From: Browns Mills, New Jersey
Originally posted by Injuneer
I can easilly demonstrate that this is not necessarily true. There is a different BTU/# content in each individual component of the fuel. Only by knowing the EXACT chemical composition of the fuel, and reflecting the energy content of each component could you make that statement. May be more energy in C16, or it may be less.
If you are pointing out that octane has a NO direct correlation to energy content, I'll agree. But you can not simply state that the energy content is the same... it isn't.
You also have to look at the means by which fuel is delivered. It is volume based. If you use a less dense fuel, you will deliver less pounds of fuel, so the energy content of the mass of fuel delivered can change. In a carb system, or in an open loop FI system, you better correct for this. That is why you need to look at "specific energy content".... BTU/volume, rather than BTU/#. And this number is differnet for each specific fuel blend. And still, there is NO correlation between octane and "specific energy content".
It can also be demonstrated that burn speed is not the key criterion for resistance to knock. It can also be demonstrated very easilly that burn speed does not correlate directly to octane level. It is a matter of what chemical compounds form under the pressure and temperature conditions in the combustion chamber, and whether they are compounds that will auto-ignite. It is not about burn speed.... although burn speed can play a part in whether detonation occurs. I've seen some interesting tricks played with VP Air Race fuel in nitrous applications.... $9.50 a gallon in 5-gallon containers.
I hate to keep posting this link , but it is one of the most reliable reference sources I have found on gasoline. In particular:
I can easilly demonstrate that this is not necessarily true. There is a different BTU/# content in each individual component of the fuel. Only by knowing the EXACT chemical composition of the fuel, and reflecting the energy content of each component could you make that statement. May be more energy in C16, or it may be less.
If you are pointing out that octane has a NO direct correlation to energy content, I'll agree. But you can not simply state that the energy content is the same... it isn't.
You also have to look at the means by which fuel is delivered. It is volume based. If you use a less dense fuel, you will deliver less pounds of fuel, so the energy content of the mass of fuel delivered can change. In a carb system, or in an open loop FI system, you better correct for this. That is why you need to look at "specific energy content".... BTU/volume, rather than BTU/#. And this number is differnet for each specific fuel blend. And still, there is NO correlation between octane and "specific energy content".
It can also be demonstrated that burn speed is not the key criterion for resistance to knock. It can also be demonstrated very easilly that burn speed does not correlate directly to octane level. It is a matter of what chemical compounds form under the pressure and temperature conditions in the combustion chamber, and whether they are compounds that will auto-ignite. It is not about burn speed.... although burn speed can play a part in whether detonation occurs. I've seen some interesting tricks played with VP Air Race fuel in nitrous applications.... $9.50 a gallon in 5-gallon containers.
I hate to keep posting this link , but it is one of the most reliable reference sources I have found on gasoline. In particular:
...I could lie and say I understood that 
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