In the first generation of LPG kit, are called Converter and Mixer (CM), the engine power is influenced strongly by the size of mixer venturi, but this case has not been widely discussed. LPG has lower carbon content than gasoline, so it requires less air to burn. Theoretically, the amount of air to burn LPG is 46% lower than gasoline. However, in practice, the venturi area of the mixer is made from 7.5 mm2 to 10 mm2 per output hp engine. To confirm this, the mixers with venturi area of 705, 960, and 1256 mm2 are applied in Toyota 5A-FE LPG-fueled engine with Tesla A-100 LPG vaporizer. The engine performance characteristics were tested using the Hofmann Dynatest Pro chassis dynamometer and the emissions were tested using QRO-401 engine gas analyzer. The result shows that the venturi area of the mixer has a major influence on the engine power, which generates specific power characteristics. However, differences in the mixer size have little effect on emissions. This study concluded that the Toyota 5A-FE LPG-fueled engine is recommended to use a mixer with venturi area of 960 mm2 (35 mm in diameter).

Bajaj Qute 4 wheel has become a new variant as an alternative to short-distance transportation in several cities in Indonesia. At present, the fleet operates with gasoline. Meanwhile, several fuel stations in several major cities in Indonesia have been equipped with LPG dispensers. Therefore, this study was conducted to compare the torque and power of Bajaj Qute with gasoline and LPG. The test is carried out in chassis dynamometer by the coast-down test method to get the actual torque and power characteristics of the car. The result, even though torque and power with LPG are slightly lower than gasoline, LPG remains promising as an alternative fuel because it is cleaner.