The E displaced 1. While the E 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. When the larger 1.
One de was an all-new quad-cam V6 displacing under 3. 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. After the initial de was finished, outside consultant Richard Ansdale produced detailed drawings escodt the new cylinder head. Harry Weslake conducted a flow bench analysis on the early head.
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Early Twin Cam prototypes had problems at the head t. Keith Duckworthwho had already left Lotus for Cosworth Engineeringwas brought back to look at the new cylinder head. Duckworth made several de changes, reshaping the ports and adding structure to the head.
The first test vehicle to receive a Twin Cam was a left southwest virginia personals drive Ford Anglia, and the engine was installed on 18 January The E's crankshaft was carried on five main-bearings. As soon as a block could be obtained work began loyus convert the Lotus cylinder head to the E block.
Assembly of the first 50 engines was contracted out to J.
Prestwich also machined the raw cylinder head castings cast by William Mills on these early twin cam engines. Total production of the engine was approximately 34, units, in 24 different varieties. The engine is also known informally as the "Lotus TC" escprt the "Twink".
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This allowed the Twin Cam to be over-bored by up to 0. The cylinder head has hemispherical combustion chambers. Valve sizes are 1. The water pump used the engine front cover as its housing, making water pump replacement difficult. The intake manifold was a series of short tubular stubs cast as an escotr part of the cylinder head.
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The he for CD Zenith - Stromberg carburettor had two siamesed stubs part of the head castingmaking them not interchangeable with earlier he lotjs Dell'Orto DHLA40 or 40DCOE Weber carburetorswhose intake was four individual tubes also part of the head casting. Later blocks were specially cast with Twin Cam production in mind and identified by an "L" cast into the block under the engine mount.
Prior to the first 4 digits were often ground off the block and "" was stamped in its place. The crank was cast iron, and the pistons had a slight crown and were fly-cut to clear the valves.
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In this version the fly-cuts were smaller, and the con-rods were Ford E parts. The flywheel was also attached to the crankshaft by six bolts, an increase of two over the model.
The Twin Cam had a problem with oil surge, and the attachment of the starter motor was subject to flexing when trying to spin the high-compression engine. Early engines had the ace escort "Lotus" in script cast in raised letters on the cam cover dscort each camshaft.
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Later engines had a raised border across the front secort the cam cover with the word "Lotus" cast in raised text set within it. The portion of the cover over the cams was smooth.
The parts for these engines could also be bought from Lotus Components Ltd. At first, these were Cosworth lohus and assembled engines with cast cranks and Cosworth name plates on the cam cover.
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Duckworth was responsible for the de of the Special Equipment cams. Cosworth later distanced themselves from this business, and Oltus started selling ' BRM ' equivalents. The ignition was advanced slightly, and larger chokes and different jets were fitted to the Weber carburettors. The portion of the cover over the camshafts had raised ribs cast in.
The larger inlet valves are compatible with earlier non Big Valve escogt he with very little modification, however increasing intake valve size by itself will not produce a measurable increase in power. The majority of the power gain comes from modifying the size and shape of the intake runners porting and fitting uprated camshafts.