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This calculator helps you determine the octane rating of a blended fuel mixture from two different fuel sources. Fill in the volumes and octane ratings of both fuels and hit the “Calculate” button to get the resulting octane rating of the mixture.
Mixing Fuels and Calculating Octane. We often get these two questions: Can I mix fuels? What is the octane when I mix them? The answer to #1 is easy. Yes, you can mix any of our race fuels. But remember – if your engine needs an unleaded fuel, you don’t want to mix leaded with unleaded.
- How Gasoline Is Rated in The U.S.
- Blending Octanes
- Other Things to Consider When Blending Fuel
- Checking Your Octane Blending Math
- Don’T Forget About Your Injectors
Before we get into the details, let’s cover some basics. Gasoline in the U.S. is rated by combining the Research octane number (which is almost always higher) with the Motor octane number (which is lower) and averaging them—which is what you see on the gas pump as (R+M) / 2 = Anti-Knock Index (AKI). Interestingly, European fuels are rated by their ...
The important thing to know is that when blending gasoline of different octane numbers, the curve is linear. This means if you blend 10 percent 100 octane race gas with 90 percent 91 pump gas, it will increase the octane of the 91 to 91.9—it’s a simple proportion problem. Or, if you mix it 50/50, then you’ll get 95.5 octane. Blending ethanol with p...
It’s also important to note that one of the major advantages of ethanol is its cooling effect. When alcohol blended fuels are introduced into the engine, the alcohol evaporates much more quickly at lower temperatures. And when this occurs, the alcohol pulls heat out of the air. An analogy would be when you go the doctor’s office and the nurse swabs...
To address your math as far as blending mixtures go, your numbers are close but our numbers indicate that a blend of pump gas and E85 to produce a splash blend mixture of E30 would be worth 3 octane points. A blend ratio of E50 or 50 percent ethanol will deliver roughly 4.5 to perhaps 5 numbers. In other words, an E50 blend of E85 and pump 91 premi...
One final caveat is that this blend ratio assumes the engine’s current fuel injectorsare large enough to supply the additional fuel volume. This is a real requirement because ethanol only produces about 75 percent of the heat of gasoline, so you have to run more fuel to make the same amount of heat. If the injectors are too small, the duty cycle on...
Octane Calculator. When your engine builder recommends a different octane than is available, sometimes it is necessary to mix two different fuels to obtain the correct octane. How do you know how much of each to use? Try our octane calculator to reach your desired octane.*
Iso-octane is assigned an octane rating of 100, indicating excellent resistance to knocking, while heptane is assigned an octane rating of 0, indicating a high likelihood of knocking.
Octane Mixture Calculator. Desired Octane of Fuel : Lowest Octane Fuel : Highest Octane Fuel : Total Desired Gallons : Calculate Octane Mix.
People also ask
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Sep 7, 2015 · Calculate your engine's dynamic compression ratio to determine octane needs:if you've ever been curious about your turbo/supercharged or high compression N/A engine's "max" compression ratio,...
