Editing Cosworth (section)

===The FVA series===
The Cortina Crossflow block was also the basis for the '''FVA''' (four valve Type A), an F2 engine introduced in 1966, and developed under the same contract as the DFV, for the new 1.6-litre engine rules. This engine featured [[multi-valve|16 valves]] operated by twin overhead camshafts driven by a train of 9 gears. The metering unit for the Lucas mechanical [[fuel injection]] was rotated by a toothed belt from the gear-driven inlet cam, while the exhaust cam directly drove an [[alternator (automotive)|alternator]] on the rear of the head. It produced {{convert|225|bhp|kW|lk=in|abbr=on}} at 9000&nbsp;rpm. This engine dominated the category until 1971, and was also used in sports car racing in 1.8 Litre form as the "FVC".

The cylinder head on the FVA pioneered many of Duckworth's ideas that would be used on the [[#The DFV(Double Four Valve)|DFV]] and a mule for the eight-cylinder engine development, FVB, was built. However, the distance between the two camshafts and the valve inclination angle were larger than on DFV for the series.

The larger displacement FVD was designed and released for endurance racing in 1975, that displaced {{convert|1975|cc|1|lk=on|abbr=on}} on the aluminium block developed for [[#The BDA series|BDG]]. The FVD produced only {{convert|275|bhp|kW|lk=in|abbr=on}}, down from the {{convert|325|hp|kW|abbr=on}} that other twin-cam four cylinders such as the Hart 420S produced but was more reliable. One was campaigned in the [[Canadian-American Challenge Cup|CanAm]] series in 1978 in the Osprey SR-1, built and driven by Dan Hartill.

{| class="wikitable"
|-
! Type !! Year !! Block !! Displacement !! Claimed !! Description !! Mainly For
|-
| FVA || 1966 || 116E || 1,598&nbsp;cc || 218–225&nbsp;bhp || Gear-driven DOHC, crossflow, four valve || [[Formula Two]]
|-
| FVB || 1967 || 116E || 1,498&nbsp;cc || 200&nbsp;bhp || Experimental || [[#The DFV (Double Four Valve)|DFV]] development
|-
| FVC || 1969 || 116E || 1,790&nbsp;cc || 235&nbsp;bhp || FVA with larger bore || 2&nbsp;L sports car racing
|-
| FVD || 1975 || BDG/aluminium || 1,975&nbsp;cc || 275&nbsp;bhp || FVC with yet larger bore on aluminium block || 2&nbsp;L sports car racing
|}