The Ascot Innova was available in three four-cylinder engine choices: the 2.0-litre F20A unit, producing in the less expensive 2.0iC and 2.0i versions with SOHC, in the 2.0Si trim with DOHC, and the H-series 2.3-litre H23A engine fitted in the export versions of the Prelude, producing (the 2.3-litre versions were designated 2.3Si-Z). While the 2.0-litre versions maintained the width which allowed them to remain in the favorable tax class, the 2.3-litre Innovas were wide, as the engine displacement didn't allow them to remain in the lower tax band, and buyers in Japan were also liable for a higher annual road tax bill also.