The investigation of the viable operating range of DMDF
combustion was carried out with a range of methanol substitution
percent (MSP) and engine loads. A set of data points were recorded
in a range between the maximum and minimum MSP without
violating the limits of measured engine knock and misfire. The
MSP-load matrix results filled with the impact of BTE at
1400 r/min are shown in Fig. 2. The maximum MSP greatly depends
on the engine load, reaching its peak of about 76% at 43.5% engine
load under this particular speed. Thus the attainable DMDF range
is limited by four bounds: partial burn, misfire, roar combustion
and knock.