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This paper is concerned with the calculation of combustion in an idealised homogenous-charge spark-ignited engine having a disc-shaped combustion chamber equipped with a central spark plug and inlet/exhaust valve. The purpose of the study is to assess the ability of a class of turbulence combustion models, first developed for steady flows, to simulate the major features and trends of reciprocating engine combustion. The models are based on the supposition that the time scales of the turbulence energy dissipation will be the controlling rates at which reactions can take place. Experimental evidence lends support to this supposition. Hitherto, in multi-dimensional engine prediction methods, combustion predictions have almost invariably been based on chemical-kinetics reaction models.