Automotive SI engine with injection of the liquid LPG into the inlet manifold

Non supercharged SI engine on LPG with mixture forming by evaporated LPG has lower power by about 8% compared to original petrol engine. This disadvantage can be eliminated by mixture forming by injection of liquid LPG. Report shows the results of the laboratory experimental research on an engine with injection of liquid LPG with the detailed analyses of the energy, power and emission engine parameters in 2 variations of the engine set-up. The thermodynamic analysis of the indicator diagram has shown that the characteristic parameters of the cycle (incl. Parameters of the combustion course) stand practically identical for operation on petrol and on LPG. The measurements on the engine were also oriented on study of conditions in the inlet manifold after injection of the liquid LPG (injection visualization with fuel vaporization, temperature in the intake port) for an explanation of any abnormality on course of the unburned hydrocarbon concentration before catalyst. The experimental results show that automotive engine with injection of liquid LPG like high-quality variation of the car drive with favorable operating economy and positive ecological effects for environment.