... reliable engine based on Toyota 4Y, with NG,CNG,LNG,LPG or Biogas as fuel. Parameter/Specifications LineItemsNGLPG1Type4 stroke, inline, water cooling, ... pre-mixing2Bore x stroke mm91×863DisplacementL2.2374Compression ratio8.88.85Rated power for matched gensets (kw/rpm)23/1,800, Engine #: NG4Y ... housing connectionSAE 411Speed sensor2 pcs, M16x1.5 4Y Gas Engine for Generator Set