(2013) is 10 ppm; as for diesel cycle
engines the value is 40 ppm.
The conduction of tests in engines of agricultural machines with Diesel cycle
is the most common, such as the consumption in sugarcane harvesters evaluated by Ramos et al.
The Diesel cycle
engines used in tractors present three types of fuel injection system, although there are others, which are individual pump, rotary pump and system with a complete injector unit (MIALHE, 1980).
The ideal Stirling cycle is unattainable in the real world, as with any heat engine; efficiencies of 50% have been reached,  similar to the maximum figure for Diesel cycle
The data were collected by performing dynamometric tests using two engines for the same John Deere agricultural tractor (model 6415), equipped with used John Deere diesel cycle
engine (model 4045T, series 350), turbocharged with direct injection four cylinder and 4.5L of displaced volume.
HPDI technology uses natural gas as the primary fuel in a diesel cycle
Instead of premixing the fuel and air, "they were operating on a diesel cycle
, in which air is compressed and fuel is injected," he said.
Among the proposals of alternative fuels, the addition of ethanol in diesel oil has gained attention, being its use in diesel cycle
engines stimulated (HANSEN et al., 2005).
"Because we retain the diesel cycle
, we'll have a very high power density in relation to other natural gas engines on the market," according to Doug Yip, director of Westport's high horsepower group.