In　order　to　use　methanol　as　alternative　automotive　fuel,　the　basic　492QA　automotive　gasoline　engine　was　retrofitted　to　492M　methanol　automotive　engine.　Intake　preheating　is　adopted　to　improve　the　mixture　formation　process　and　increase　the　intake　temperature.　The　M90　fuel　and　PTC　heater　are　used　to　improve　the　cold　starting　performance.　And　some　important　technical　methods　such　as　increasing　compression　ratio,　selecting　suitable　spark　plug,　optimizing　the　spark　timing　are　employed　to　improve　the　power　performance　and　thermal　efficiency.　The　maximum　combustion　pressure　of　492M　methanol　engine　is　controlled　designedly　so　as　to　assure　the　working　reliability.　The　results　from　bench　test　492M　methanol　automotive　engine　show　that　the　power　performance　and　thermal　efficiency　have　been　improved　effectively,　the　maximum　power,　the　maximum　torque　and　the　maximum　effective　thermal　efficiency　increases　by　2.4%,　6.2%　and　20.7%,　respectively.　And　the　maximum　exhaust　temperature　decreases　by　9.4%,　which　proves　that　the　492M　SI　methanol　automotive　engine　have　been　successfully　developed.