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Lotus twin cam

The Lotus Twin Cam engine ( [link] and [link] ) was developed from the Ford 1498 cc 116E pre-crossflow engine block. Overbored and given a longer stroke crankshaft the capacity was raised to 1558 cc. Using twin Weber 40 DCOE carburetors ( [link] ) the Twin Cam model with 115 bhp in Special Equipment tune or as a Lotus-Holbay version 126 bhp ( [link] and [link] ). A summary of the specifications of the Special Equipment tune Twin Cam engine is given in [link] .

The 1558 cc Lotus Twin Cam engine as used in the Seven S3 SS, Seven S4, Elan, Elan +2, Europa Twin Cam, and Lotus Cortina ( www.burtonpower.com ).
A cut away of the 1558 cc Lotus Twin Cam engine.
The Weber 40 DCOE sidedraught carburetor.
The engine bay of a Twin Cam powered Seven S4 showing the air box.
A cut-away drawing of the Twin Cam powered version of the Seven S4 with general technical data (Lotus Cars, Ltd.).
Summary of engines used in the Lotus Seven S4.
Engine Lotus Twin Cam Ford Kent (1600 GT)
Displacement (cc) 1558 1599
Bore (mm) 82.55 80.98
Stroke (mm) 72.74 77.62
Compression ratio 9.5:1 or 10.3:1 9.0:1
Power (bhp) 105 to 120 84 (110)
Torque (lbs/ft @ rpm) 108 @ 4500 (113 @ 5500) 91 @ 5500 (105.5 @ 4800)
Oil pressure 35 - 40 35 - 40
Valve clearances In 0.005, Ex 0.009 In 0.010, Ex 0.022
Carburetor Twin Weber 40 DCOE sidedraught Single Weber 32DFM twin choke downdraught

The ford crossflow kent

Ford introduced the 105E Kent engine in 1959 in a number of displacements: 997 cc, 1198 cc, 1340 cc, and 1500 cc. All of these early Kent engines had both inlet and exhaust valves on the same side of the head. In 1967 Ford redesigned the head as a crossflow unit creating the definitive 1300 cc and 1600 cc engines ( [link] ). In 1970 Ford further improved the block making it stronger and more suitable for tuning and racing applications. These blocks are designated by their “711M” numbering. As used in the Seven the 1600 cc engine was essentially that from the Ford Cortina GT and used a standard Ford intake manifold with a single Weber 32DFM twin choke downdraught carburetor ( [link] and [link] ). A summary of the specifications of the Cortina GT tune Ford crossflow Kent engine are given in [link] .

The Ford Kent 1600 cc crossflow engine ( www.burtonpower.com ).
The Weber 32DFM twin choke downdraught carburetor. Copyright: Pegasus Auto Racing.
The engine bay of a 1600 cc crossflow powered Seven S4 showing the pancake air filter. This example is in need of restoration.

Gearbox, clutch, and bellhousing

As with the S2 and S3 Seven, the Ford Mark 2 Cortina GT/Corsair 2000E gearbox was employed. More correctly known as the 2821E, it is a semi-close ratio 4-speed all synchromesh gearbox ( [link] ), with synchromesh on all forward gears. Since it was also used in the Lotus Elan it meant a commonality of supply for Lotus Cars and Lotus Components.

Gear ratios for Ford 2000E Corsair gearbox as used in the Lotus Seven S4.
Gear Gear ratio
1 2.97 : 1
2 2.01 : 1
3 1.40 : 1
4 1 : 1
Reverse 3.32 : 1

As fitted to the Seven (and Ford’s own Corsair and Cortina) the gearbox was used with a separate remote control assembly ( [link] ). The three-rail selector mechanism was later replaced by a single selector rail; however, since this requires modification to be used in the Seven it was not adopted.

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Source:  OpenStax, Lotus seven s4 (type 60): design, restoration, and maintenance. OpenStax CNX. Jun 07, 2013 Download for free at http://cnx.org/content/col11418/1.19
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