Proper Octane

[dvldwg89]

When I rebuilt my 383 30 years ago I made it high compression. 100 octane was cheap back then. Well today it ain't cheap. 7 bucks a gallon.  My question is if I fill my 18 gallon tank with 93 pump gas, how much octane additive do I need to add to get it to 100 octane? What brand of octane boost should I use?

[Oldschool]

Here is the mixture calculator I use. It works pretty well. I mix VP C16 with 93 octane to the ratios shown to get the desired amount of gallons. It is way cheaper than running straight race gas. it cuts the race gas usage way down and makes it more affordable. I bought a drum of C16 which is 116 octane for about $700.00 and then mix it with pump gas. I only need 95 octane, so the race gas goes a long way and in a year, I have only used about 20 gallons of the VP fuel.

http://wallaceracing.com/octane-mix-calc.php

Easy to use calculator.

[dvldwg89]

  thanks Oldschool !

[Oldschool]

thanks Oldschool !

You are very welcome. I hope it helps ya out...   

[cudabob496]

what is your compression ratio?

[72cudamaan]

When I rebuilt my 383 30 years ago I made it high compression. 100 octane was cheap back then. Well today it ain't cheap. 7 bucks a gallon.  My question is if I fill my 18 gallon tank with 93 pump gas, how much octane additive do I need to add to get it to 100 octane? What brand of octane boost should I use?

A typical additive won't generally get you to where you want to be. You need (as Oldschool pointed out), either a higher octane
rated fuel to "dilute" into the lower octane rated fuel or something like Torco additive which is a highly concentrated fuel. Either
way will get you to your goal for a cheaper price than straight 100 octane fuel. But don't be fooled into thinking that
you can just add cheap octane booster from autozone and get the desired effect.

[Oldschool]

A typical additive won't generally get you to where you want to be. You need (as Oldschool pointed out), either a higher octane
rated fuel to "dilute" into the lower octane rated fuel or something like Torco additive which is a highly concentrated fuel. Either
way will get you to your goal for a cheaper price than straight 100 octane fuel. But don't be fooled into thinking that
you can just add cheap octane booster from autozone and get the desired effect.

The great thing about the VP C16 is that it will actually blend with the pump gas. Some race type fuels will not blend with pump gas and that won't work.  Some will separate like water and oil because they are chemically so dis-similar. VP blends perfectly...

[72cudamaan]

The great thing about the VP C16 is that it will actually blend with the pump gas. Some race type fuels will not blend with pump gas and that won't work.  Some will separate like water and oil because they are chemically so dis-similar. VP blends perfectly...

Good to know.   

[brads70]

Here is the mixture calculator I use. It works pretty well. I mix VP C16 with 93 octane to the ratios shown to get the desired amount of gallons. It is way cheaper than running straight race gas. it cuts the race gas usage way down and makes it more affordable. I bought a drum of C16 which is 116 octane for about $700.00 and then mix it with pump gas. I only need 95 octane, so the race gas goes a long way and in a year, I have only used about 20 gallons of the VP fuel.

http://wallaceracing.com/octane-mix-calc.php

Easy to use calculator.

Nice link, Thanks saved that one in my favorites.

The great thing about the VP C16 is that it will actually blend with the pump gas. Some race type fuels will not blend with pump gas and that won't work.  Some will separate like water and oil because they are chemically so dis-similar. VP blends perfectly...

Great info thanks! 

[dvldwg89]

what is your compression ratio?

Well if memory serves me right 11.5 to 11.75. Its been awhile but last time (15 years ago) that I tried to run pump 95 it got real hot and started pinging. Used 100 ever since and no problems.

[dvldwg89]

A typical additive won't generally get you to where you want to be. You need (as Oldschool pointed out), either a higher octane
rated fuel to "dilute" into the lower octane rated fuel or something like Torco additive which is a highly concentrated fuel. Either
way will get you to your goal for a cheaper price than straight 100 octane fuel. But don't be fooled into thinking that
you can just add cheap octane booster from autozone and get the desired effect.

Roger that!

[cudabob496]

Well if memory serves me right 11.5 to 11.75. Its been awhile but last time (15 years ago) that I treied to rum pump 95 it got real hot and started pinging. Used 100 ever since and no problems.

Do you have iron heads?

[dvldwg89]

Do you have iron heads?

yes original heads

[Chryco Psycho]

Alum heads would probably make it livable on 93 octane with maybe a bit of additive / mixing

[tommyg29]

A full drum?
Fuel starts breaking down after a few months