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Ford Escort Lotus Twin Cam

Early engines had the word "Lotus" in script cast in raised letters on the cam cover above each camshaft. Prior to the first 4 digits were often ground off the block and "" was stamped in its place. While the Escodt block only provided three main bearings for the crankshaftthe oversquare de kept piston speeds down and gave room for larger valves in the new cylinder head.

The Twin Cam had a problem with escorg surge, and the attachment of the starter motor was subject to flexing when trying to spin the high-compression engine. Later blocks were specially cast with Twin Cam production in mind and identified by an "L" cast into the block under the engine mount.

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The engine is also known informally as the "Lotus TC" or the "Twink". Later engines had a raised border across the front of the cam cover with the word "Lotus" cast in raised text set within it. The parts for these engines could also be bought from Lotus Components Ltd. After the initial de was finished, outside consultant Richard Ansdale produced detailed drawings of the new cylinder head. The flywheel was also attached to the crankshaft by six bolts, an increase of two over the model.

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The E displaced 1. Duckworth was responsible for the de of the Special Equipment cams. At ootus, these were Cosworth developed and assembled engines with cast cranks and Cosworth name plates on the cam cover.

The latter had used the Ford-based litre Lotus Twin Cam engine to good effect, and combining this unit with the smaller and lighter Escort bodyshell would​. The bhp Lotus-powered Escort Twin Cam was conceived and developed by Ford's Boreham based competitions department during and unleashed on. Genuine Escort Twin Cam from the very last production and of units Built ( - ). The car is part of a lot of 6 TC cars that were shipped new to.

Valve sizes are 1. This allowed the Twin Cam to be over-bored by up to 0.

Escort Mk1 TwinCam

Duckworth made several de changes, reshaping the ports and adding structure to the head. Harry Weslake conducted a flow bench analysis on the early head.

One de was an all-new quad-cam V6 displacing under 3. As soon as a block could be obtained work began to convert the Lotus cylinder head to the E block. The ignition was advanced slightly, and larger chokes and different jets were fitted to the Weber carburettors. The he for CD Zenith - Stromberg carburettor had two siamesed stubs part of the head castingmaking them not interchangeable with earlier he using Dell'Orto DHLA40 or 40DCOE Weber carburetorswhose intake llotus four individual tubes also part of the head casting.

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Financial problems at Facel kept either engine from reaching production, but when Chapman found out about the smaller engine he commissioned Mundy to adapt the Facellia de to the Ford engine block. Total production of the engine was approximately 34, units, in 24 different varieties. The larger inlet valves escodt compatible with earlier non Big Valve cylinder he with very little modification, however increasing intake valve size by lots will not produce a measurable increase in power.

The water pump used the engine front cover as its housing, making water pump replacement difficult.

At a Glance:

The E's crankshaft was carried on five main-bearings. Cosworth later distanced themselves from this business, and Lotus started selling ' BRM ' equivalents. Prestwich also machined the raw cylinder head castings cast by Escprt Mills dscort these early twin cam engines. Early Twin Cam escorts had problems at the head t. The majority of the power gain comes from modifying the size and shape of the intake runners porting and fitting uprated camshafts.

The crank was cast iron, and the pistons had a slight crown and were fly-cut to clear the valves. The lotus of the cover over the cams was smooth.

Ford Escort Lotus Mk1 Review

Assembly of the first 50 engines was contracted out to J. Keith Duckworthwho had already left Lotus for Cosworth Engineeringwas brought back to look at the new cylinder head. In this version the fly-cuts were smaller, and the con-rods were Ford Escor parts.

When the larger 1. The cylinder head has hemispherical combustion chambers.

The first test vehicle to receive a Twin Cam was a left hand drive Ford Escoort, and the engine was installed on 18 January The intake manifold was a series of short tubular stubs cast as an integral part of the cylinder head. The portion of the cover over the camshafts had raised ribs cast in.