Does anyone now how much 10gal of vp racing fuel cast. Becuze now im runnig 13.1 and I need to now how much that gas runs. Thanks

There are about 6 different VP fuels from 6.50-22.00 a gallon.. C12 is 108octane and about 7 a gallon.. You only need a 60/40 mix. 60% being pump gas..

So idont have to use the gas straight I will be able to mix the gas .

Correct..

thanks

I've got 13.1:1 in the SM bike now, fueled by VP100. One station in town has the stuff for $5.39 a gallon, right at the pump.

hear in oh c-12 is about 40-45 per 5 gallon.....that is what i run in my 2-smokers

I hate to sound like the Professor from Gilligans Island but I'll give some technicalities ehre.
Pure 100 Octane is also known as C8H18, with a boiling point of 125.7 Farhn.
Pure Heptane is known as C7H16 with a boiling point of 98.4 Farhn.
Boiling point is when the liquid starts evaporating into air.
Law of Physics state that whenever you compress a liquid, it heats up.
Thus a stock engine with 11.3:1 compression, will compress the gas/air mixture and heat it up at the same time.
If the Octane level is low, the mixture will ignite before the spark hits, this is called detonation.
So 89 grade gas is 89% Octane and 11% Heptane.
91 grade is 91% Octane and 9% Heptane.
100 Octane is 100% C8H18.
Some companies can make 100 Octane by taking grade 91 and adding chemicals that help raise the boiling point.
The idea of 110 octane is only a reference of how much compression the fuel will take before it ignites(boils). It is 10% higher than 100.
So if you mix 110 octane gas and 89 octane gas you don't really get 99 octane.
You get more like 92 or 93 Octane rating.
It is best to buy a formulated 97 or 100 Octane gas and that is what you get.
100% Octane, not 100 Octane rating.
I don't know the physics tables on compression to heat ratio I am sure there is a physicist here besides me.

What was your point, xkmail?...

I buy Turbo Blue I believe 108 octane and mix 50:50 with Chevron 91 with my 12.5:1 HH piston. No pinging....but it pinged and blew a head gasket on 91. I think it should be mentioned in addition to Xmail's lengthy post that lead has a lot to do with it. According to turbo blue's website, the gas I puchased is leaded. The reason why 60's and 70's muscle cars used leaded gas was because it had a higher natural octane level, ie does not pre-detonate under high compression applications. Maybe you should include that in your math?

My point is just simple information.
Mixing 110 octane and 90 octane is not 100 octane.
Some fuels have an octane rating, but are not really 100% Octane.
If your rings go bad it is usually because of lack of good lubricity of the oil, not predetontation(knocking)
Knocking destroys valves and piston top.
The addition of TEL (TetraEtheyl Lead) was an old standard of increasing Octane rating. However adding a TEL based product (AVGSAS) to newer formulated pump gas which contains ethanol and MTBE, actually reduces the Octane rating somewhat. That's something I researched on wikipaedia.
ANyways heading to the track, let's talk later.

xkmail does have a lot of validity in what he is saying. However, you will most likely see a very minute difference in performance while riding the quad. Luckily, because the fuel is a combustable, its very forgiving on what fuel we use and how its jetted. A good example of where fuel selection would be more crucial, for instance like drag racing, where that 1/100th of a second makes a difference at the finish line.

Zhvonte, quick question... Any gas stations in Phoenix (preferrably the NW side) have racegas at the pump? I found the station in town here with the VP100, and that was the reason I tossed in a 13.1:1 compression ratio piston on the SM. If I can't find something at the pump there, I'll take out that piston and replace it with a 12.5:1...

Let me know, brother...

Tom,
There must be some because there is a station On chandler Blvd and 42 st. on the East Side that has VP100 octane at the pump. Its just out of my way or i would get that. NW valley, you must be crazy. East Valley is where its at!!

There is nothing that I know of on that side of town. The only one that I know of over in scottsdale, if they still have it....

i should mention that last I seen was 56th st and thunderbird

back bout 5 yrs ago

gee,im suprized that no one mentioned that mixing leaded and unleaded fuel is a big no-no.........

They can be mixed - mixing premium pump gas with leaded, oxygenated racegas will lead to the oxy gas breaking down much, much faster though.

I've mixed for years will zero problems.

Found this in a search!

Sorry to drag back a semi old thread, but I am running 13.5:1 and I dont know all of the rules on mixing...

I have been running Phillips Track Tech 111, and I know that it is more than I need so I started blending it down with 91 octane premium. So far I have only mixed as far as 3-1/2 gal. race fuel to 1-1/2 premium out of caution.

How much is safe? Is there a good rule of thumb to go by?

They get $7 per gal. for 111 in little sahara, and I dont really want to pay that much for fuel.

I can get it for $5 per gal here at home. I want to blend about 10 gal. to take with me.

NormalZ, the is a station you passed the other day on Cave creek road that has race gas. I believe it is 105 octane. It is not far from my house, I'll check it and let you know.

I found this calculator for finding out what octane you get when you mix fuels.

fuel calculator

Good find buddy! According to that, Im already in the ball park, or at least as close as I want to get for not actually knowing. Im not 100% confident in it since it doesnt figure in any of the above mensioned details though.