If a fuel has a high enough octane rating so that it doesn't wildly ping in a spark ignition engine, it will be nearly, if not impossible, to start in a diesel engine.
42.
To overcome this, development has been directed toward flash boilers, which heat a much smaller quantity of water to get the vehicle started, and, in the case of Doble cars, spark ignition diesel burners.
43.
Spark ignition engine development include : fuel injection, including the gasoline direct injection variant, as well as improving volumetric efficiency by using multi-valves per cylinder, variable valve timing, variable length intake manifolds, and turbocharging.
44.
However, in engines that utilize compression rather than spark ignition, by means of very high compression ratios ( 14-25 : 1 ), such as the diesel engine or Bourke engine, high octane fuel is not necessary.
45.
Due to the downward movement of the pistons and the restriction caused by the throttle valve, in a reciprocating spark ignition piston engine, a partial vacuum ( lower than atmospheric pressure ) exists in the intake manifold.
46.
It should also be noted that most major manufacturers of medium-speed engines make natural gas-fueled versions of their diesel engines, which in fact operate on the Otto cycle, and require spark ignition, typically provided with a spark plug.
47.
In race trim it was a high-performance engine of 2, 090 cc with either a Toyota or a KKK / K27 turbocharger, electronic fuel injection, and a twin-spark ignition system, producing 360 to 600 PS depending on race trim.
48.
The diesel internal combustion engine differs from the gasoline powered Otto cycle by using highly compressed hot air to ignite the fuel rather than using a spark plug ( " compression ignition " rather than " spark ignition " ).
49.
While such 24 volt thermostats are incapable of operating a furnace when the mains power fails, most such furnaces require mains power for heated air fans ( and often also hot-surface or electronic spark ignition ) rendering moot the functionality of the thermostat.
50.
The VDI ( Association of German Engineers ) created DIN standard 1940 which says " Otto Engine : internal combustion engine in which the compressed fuel-air mixture is initiated by a timed spark ignition " which has been applied to all engines of this type since.
