Comparison of my pistons! First image is after 1 year of VP110 race fuel. Then I cleaned it perfectly and replaced rings before putting it back together. Second image is the same piston, but after 1 year of E98 Ethanol! Almost as clean as it was a year ago, slight discoloration, and very minor carbon/pitting (I could see it in real life). But what a difference between the two!! Scientifically ethanol does not produce as many hydrocarbons when combusted compared to gasoline, therefore does not create as much carbon buildup. Carbon buildup leads to detonation, higher cylinder temps, pre ignition, and leaking valves/valve seats due to the carbon built up on the backside of the valves and therefore the valves don't seal, ultimately carbon buildup sacrifices power and is bad.
Last edited by B-B123; 02-27-2019 at 12:04 AM.