What is the highest octane rating a gasoline can have?
For research and motor octane ratings the ASTM methods No. D2699-81 for the operation of the octane engine gives a scale up to 120.3. Why do plugs with VP gasoline look so lean? Because the percentage of the aromatic hydrocarbons in the fuel is relatively low compared to other gasolines. These products have soot forming properties in gasoline. Will an engine run cooler with VP? Yes, C-12 and C-14 will absorb more heat than other gasolines and tend to cool the intake charge. This is especially noticeable in 2-stroke applications. Can I use C-14 in endurance and oval track engines? Yes, but C-12 is better suited for the high cylinder wall temperatures that these engines experience. These engines also generally run below 8000 RPMs and power output for these two fuels is the same up to 8000 RPMs. What type of 2-stroke oil should be used in C-12? C-12, C-14, and VP Red work very well with synthetic or petroleum based oils. However, bean oils will tend to separate below 35 degrees F. in fuel
