Octane calculator

[Rixster]

I know that last year I saw some links to then on here, where are they? I need to get at least 91. The highest I can buy from the pump is 89. How much 100 leaded do I need to add to get above 91? Or even better what is the ratio?

 

[Ex-Member]

should be a matter of ratios... 2 parts 100 to 11 parts 89 would yield 91...

 

[MN_Nole]

I have a calculator for additives, post pump to get the octane.so not helpfull.

Best bet check a motorcyle/V rod forum as they are alwasy looking for the octane rating, incase you can not find it.

 

[Gimpster]

I use toulene to boost octane (114).
I'll look around and see if I can find the link in my laptop for mixing to use for a guideline

The one for toluene is here, it should apply to other octanes replacing the octane rating in place of the toluene octane
As you read it is broken down a little better as for formulas
http://www.elektro.com/~audi/toluene/

----- Gimpster -----

 

[m8magicandmystery]

isnt octane rated at sea level..????...so if you ride at 3000 ft the 89 should be 92 octane...one octane increase with every thousand ft above sea level...am i right or wrong..???

 

[Rixster]

isnt octane rated at sea level..????...so if you ride at 3000 ft the 89 should be 92 octane...one octane increase with every thousand ft above sea level...am i right or wrong..???

UM, no

 

[Rprecision]

isnt octane rated at sea level..????...so if you ride at 3000 ft the 89 should be 92 octane...one octane increase with every thousand ft above sea level...am i right or wrong..???

I think you have that backwards. If I had a sled with 125 LBS of Compression at 10'000' at 00500' it would be closer to 150 or higher depending on a great number of variables chiefly barometric pressure.

So you need a higher octane (More Detonation resistant) at lower elevations then you do at higher typically

 

[Rixster]

( Gallons_of_gas * Octane_of_gas ) + ( Gallons_of_toluene * 114 )
___________________________________________________
Total Gallons
So cant I use this? Just change gallons of toluene to gallons of 100 octane fuel?
Should work, with any mixture really.

(Gallons of gas * octane) + (gallons of gas * octane)
_______________________________________________
Total gallons

(8 *91) + (3 * 100)
_________________ =93.45
11

Like that.

 

[Burns]

Or if you want a plug and play excel sheet based on these formulas (I had to zip it due to file type restrictions).

Mike

 

[sledjunkies]

We use Toluene to thin our paint... ???
That would be a cheap way to up the octane...please post your formula!

I use toulene to boost octane (114).
I'll look around and see if I can find the link in my laptop for mixing to use for a guideline

The one for toluene is here, it should apply to other octanes replacing the octane rating in place of the toluene octane
As you read it is broken down a little better as for formulas
http://www.elektro.com/~audi/toluene/

----- Gimpster -----

 

[sledjunkies]

Toluene is almost as expensive as race fuel. At least it is in Canada. I just checked with my supplier and It's less than $100 from a barrel of C12. It would be an expensive additive.

 

[Gimpster]

We use Toluene to thin our paint... ???
That would be a cheap way to up the octane...please post your formula!

Yes, it is expensive. If you buy a lot of it around here, get ready to answer some questions. They have an eye on that stuff for production of meth reasons ?
I use Toluene to bump up octane in fuel around here racing dirt cars. The officials are not smart enough to detect it.

Thanks for the sheet Burns

----- Gimpster -----

 

[sled_nutz]

http://www.motorsportsracingfuels.com/OctaneCalculator.html

 

[Gimpster]

Thanks

----- Gimpster -----

 

[m8magicandmystery]

Originally Posted by m8magicandmystery
isnt octane rated at sea level..????...so if you ride at 3000 ft the 89 should be 92 octane...one octane increase with every thousand ft above sea level...am i right or wrong..???

I think you have that backwards. If I had a sled with 125 LBS of Compression at 10'000' at 00500' it would be closer to 150 or higher depending on a great number of variables chiefly barometric pressure.

So you need a higher octane (More Detonation resistant) at lower elevations then you do at higher typically

im not talking about the requirements of the engine...what i was saying was....is it not the property of fuel to gain one octane every thousand feet above sea level..??...and isn,t all fuel rated at sea level..so 87 fuel rated at sea level is 93 if you ride at 6000 ft..if you buy the fuel at a gas station in a town at six thousand feet the pumps still indicate the sea level rating but the octane is actually higher... im just asking confirmation on this...l had a Chevron station and the Chevron rep told me this was the case...so is this all b.s....???

 

[lakercr]

Don't know if this is what you're looking for or not...

You can change the pump octane (A16) and race fuel octane (N4) to whatever you're working with and the sheet will re-calculate all of the ratios for you.

 

[Rixster]

I though about using some toluene for a octane booster but after reading on that previous post, it says it is hard to ignite at low temperature. It says that formula one cars have to use a aux. heater to heat the motor before they can get it to fire on toluene. really don't want that problem on that mountain at 7 degrees.

 

[funjunkie]

The octane in the fuel would not up in altitude the engine would require less octane. Do to the loss of compression.

 

[Rixster]

The octane in the fuel would not up in altitude the engine would require less octane. Do to the loss of compression.

Right!

 

[Gimpster]

I though about using some toluene for a octane booster but after reading on that previous post, it says it is hard to ignite at low temperature. It says that formula one cars have to use a aux. heater to heat the motor before they can get it to fire on toluene. really don't want that problem on that mountain at 7 degrees.

Good point. When I run alky on a cooler evenings race, We run the engines often to keep the motor warm, so they will run.

----- Gimpster -----