This Lotus Esprit Silhouette Special race car is the home of the very first Wildcat 5-litre engine (Lancashire,UK). Ian Richardson of Wildcat Engineering in collaboration with Simon Allaway (Owner) and John Felstead developed and built the Prototype engine with the following Wildcat Engineering components (and other components individually named):

A pair of downdraught manifolds

Four Dellorto 48mm twin choke carburettors

Stage 1 Prototype Heads with 47.75mm & 40.64mm (1.88″ & 1.60″) valves and shaft mounted Kenne Bell adjustable roller rockers

3.9 Rover V8 engine block with bespoke cross-bolted aluminium billet main bearing caps

Omega 94.04mm forged pistons

 H-beam conrods and 88.90mm stroke forged steel crankshaft

Real Steel RS266 mechanical camshaft

Mallory distributor body with Lumenition ignition internals

Titan Motorsport 3-stage dry sump oil pump and sump pan



Power 400 hp @ 7000 rpm

Torque 330 lb-ft @ 6000 rpm






5-litres = 94.04mm bore x 88.90mm stroke = 4940cc

(301ci = 3.702″ bore x 3.5″ stroke)


Here is the first Dyno run held at John Eales facility as part of an article written in the 1997. Note the fuel stand-off, (The mist created over the carburettors) this is due to the standard Rover exhaust manifold flanges being too small for the Wildcat cylinder head exhaust ports.