Two possibilities for using methanol in heavy-duty, engines are discussed:
If the engine is modified according to the fuel properties pure methanol can be used as fuel for a spark ignition methanol-gas engine.
When the fuel is adapted to meet, the requirements of the engine additized methanol serves as a fuel for an only slightly modified direct-injection diesel engine.
The comparison takes into, consideration fuel cost, convertibility of vehicles already in use, operational safety, and; reliability, requirements regarding fuel production and distribution, conventional fuel/alternative fuel reversibility, and environmental aspects.
It can be concluded that both systems appear to be suitable in certain-heavy-duty engine applications.