Cosworth SCA series

The Cosworth SCA series is a family of 997 cc, single overhead camshaft, two valve racing engines that Cosworth built for the one litre Formula 2 introduced in 1964, and it carried the first cylinder head that Cosworth designed entirely itself. It was based on the Ford Cortina 116E block, with a Laystall forged crankshaft, steel main bearing caps and pistons that each had only one compression ring and one oil scraper ring, and its reverse flow head was driven through a series of seven spur gears. The intake ports and the dry sump pickup were canted so that the engine could be mounted 25 degrees from vertical for a lower centre of gravity. Fed at first by two twin choke Weber carburettors it made 115 hp, and Lucas fuel injection from 1966 eventually raised that to 140 hp. The SCA won the first race under the new rules, the 1964 Pau Grand Prix with Jim Clark. The longer stroke SCB was built as a benchmark for the four valve work that led to the FVA, and the SCC was a larger 85 mm bore version sold for the SCCA 1.1 litre sports car class.