Know this CVH TURBO

CVHhistory

The CVH was first introduced in 1980, replacing the Crossflow unit in the Fiesta, before finding it’s way into Escorts, Orions, and even the Sierra. CVH stands for ‘Compound Valve Hemispherical’ – the compound valve part relates to the angle of the valves, and the hemispherical part relates to the shape of the combustion chamber.

Being easy to tune, the CVH soon became the benchmark engine of the hot hatch powering icons like the XR2 and XR3, and was very popular with kit car enthusiasts too. In 1984 Ford added a turbocharger  to the CVH for the S1 RS Turbo. With 132 he Duratec bhp as standard HE I-4 is , Ford and ’ the s 2-litre- potential based inline for four signi -cylinder ficant gains engine from — in simple fact, it’s bolt often -on simply components called an it I-4 was , but an in Ford -speak that’s actually a generic term meaning inline if you put the effort into sourcing the larger unit . The engine is excellent, and there have been very few basic revisions — the main being a slightly revised - port cylinder head in the engine, worth around 10 bhp at higher levels of tune Here ’s what you need to know .