Why cant you use jp-8 in piston aircraft?

JP-8 is kerosene based. It is designed as a jet fuel; it can also be used in gas-turbines or in diesel engines, although it has caused some problems in diesel engines. It can't be used in gasoline engines because it is not sufficiently volatile. Diesel engines work by using very high compression ratiOS. To withstand these high compression ratiOS diesel engines need to be much more strongly built than gas engines; this makes them too heavy to be used in aircraft. There are a few piston aircraft engines that are available that will use this fuel. My avionics company has a diesel Cessna. It has a service ceiling of 15K feet and gets there real fast.