Conventional fuels for ICEs

Question 1

What are some requirements for the fuel of SI engines?

Answer 1

Evaporation-mixture formation (because gassoline need to be pre-mixed with air, it must easely be mixed)
Ignition energy
Flame speed
Anti- knock
Exhaust emissions
Deposit formation

Question 2

What are some requirements for the fuel of CI engines?

Answer 2

Viscosity (because is beeing spreyed)
Auto ignition properties
Volatility
Emissions formation
Deposit formation
Lubricity (very important for CI-engines. the diesel must lubricate the pump)