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Video Mineral Oil 1
Video Mineral Oil 2
Video Mineral Oil 3
Video Mineral Oil 4
Video Mineral Oil 5
Video Mineral Oil 6
Video Mineral Oil 7
Video Mineral Oil 8
Video Mineral Oil 9
Video Mineral Oil 10

Video Fuel
Video Characteristics of fuels
Video Fuel Filter
Video Fuel Tank
Video Fuel vapours
Video Petrol 1
Video Petrol 2
Video Knock Resistance
Video Ethanol 1
Video Ethanol 2
Video Hydrocarbon
Video Diesel Fuel 1
Video Diesel Fuel 2
Video Wrong fuel
Video Cetan number
Video Sun Fuel
Video Biologic Diesel Fuel
Video Vegetable Oil Fuel
Video Fuel Cooling
Video Fuel Preheating
Video Sel. Catal. Reduction
Video Liquef. Petroleum Gas
Video LPG conversion 1
Video LPG conversion 2
Video Opel Corsa LPG 2007
Video Natural Gas
Video Natural Gas Running
Video Air
Video Methanol Operation
Video Nitrous Oxide

Video Fuel 1
Video Fuel 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


PetrolMOZROZSpec. calorific
value (kJ/kg)
Density at
Regular-grade82,59142.7000,745 g/cm
Super85   9543.5000,76g/cm
Super Plus88  98
Methanol ca 16019.9000,795 g/cm
Compressed Natural Gas 120-13032.000-45.0000,700-0,840 kg/m


In Summer time, petrol producers should fight steam bubble formation by adding more hard boiling portions, containing slightly more energy. In winter time the cold start of the engine is made easier by adding more light-boiling components, thus less non-boiling portions end up in the engine oil. Petrol should boil early, gasify easily, and, nevertheless, be ignition-reluctant.

How it works

Petrol consists mainly of aliphatic hydrocarbons. They evolve during the distillation of crude oil. In this process, the different substances are separated according to their boiling points. To raise their portion of approx. 30%, special processes as for example the cracking (chopping up of big molecule chains) are common. The high antiknock characteristic typical for petrol comes about from interlinking the molecule chains (polymerization).

Other important characteristics like for example the avoidance of carbonization in intake valves are accomplished by additives. The high antiknock characteristics and the resulting ignition-reluctance of the petrol are due to the working principle of the petrol engine. While compressing the fuel in the combustion chamber it must not inflame itself. The spark plug should ignite the fuel mixture at the ignition time, precisely calculated by the control device. The higher the compression, the more efficient the combustion, and the more performance the petrol engine may produce. The flash point is the temperature at which inflammable vapors evolve. For petrol it is -20C, the burning point is 240C. Thus, petrol belongs to danger class AI. (flash point below 21C).


Petrol vapors are invisible, heavier than air and highly explosive.               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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