Lotus Seven Series 3
from Classic to Modern
In 1968, the Lotus Seven Series 2 sports car was discontinued after a total of 1,370 units had been built.
By that time, the supply of Standard 10 back axles had all but ceased, and a replacement needed to be found urgently.
Fortunately, Ford saved the day by making available the back axle from the Ford Escort Mexico saloon, which had the advantage of being much stronger than that from the Standard 10 saloon.
In 1967, the Formula Ford racing team used the new Ford Crossflow engines as the standard unit to be fitted to their sports racers.
In a Crossflow engine, the design of the combustion chamber was altered.
Although the head was flat, the piston crown featured a form of Heron combustion chamber.
Also, this range of Crossflow engines was fitted to the Lotus Cortina GT and, shortly afterwards, to the sports versions of the upcoming Ford Escort Mark 1.
The only obvious difference between the Series 2 and 3 was the fact that the rear wings had to be widened in order to accommodate the new, wider back axle from the Escort Mexico.
|Production||August 1968||August 1968||January 1969|
|Cylinders, bhp||4, 84||4, 63||4, 115|
|Top Speed mph||101||94||107|
|0-60 mph, secs||8.3||9.7||6.9|
|0-100 mph, secs||-||-||-|
|Standing 1/4 Mile, secs||-||-||-|
1969 Lotus Seven Mk 3
Lotus Seven Series 3
1969 Lotus 7 Series 3
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In August 1968, the Lotus Seven Series 3 sports car was launched, and featured a 1600 cc Ford Crossflow engine.
This was an overhead valve unit with a compression ratio of 9.0:1, a single Webber 32DFM twin choke carburettor, and developed 84 bhp at 5500 rpm, with 0-60 mph in 7.7 secs.
A rarer version of the Seven featured a 1300 cc Crossflow engine, which developed 72 bhp at 5500 rpm.
In January 1969, the Lotus Seven Twin Cam SS was introuced, which featured a 1558 cc Lotus Twin Cam engine from the Lotus Elan, which developed 125 bhp with 0-60 mph in 6.2 secs.
Up to that time, this was by far the most powerful, expensive, and fastest Lotus Seven that had been produced.
Only thirteen units were ever built, and this model constitutes what is probably the most sought after Lotus Seven,
Later, a version tuned by Holbay could be used, that developed 120 bhp.
Although the Series 3 weighed 200 pounds more than its predecessor, this was more than compensated for by the increased power of the different engines used.
By now, as a result of its racing connections, Lotus had built up a close relationship with Ford.
Consequently, modifications were made to the Series 3 in order that it could utilise a number of Ford components.
Between 1968 and 1970, at a production rate of five cars a week, a total of 350 units of the Series 3 were built.
Unfortunately, by 1969, discussions were under way at Lotus to determine the future of the Seven.
In passing, it is worth mentioning the existence of the Birkin Lotus Seven.
Birkin Cars was a South African company that manufactured just one product, their version of the Series 3 Lotus Super Seven, both as kit car and pre-built versions.
The cars were marketed through dealerships around the world.
Production began in 1983, and typical 4-cylinder engines on offer included the Ford Zetec and Toyota 4AG.
One interesting development included the replacement of the original live axle with independent rear suspension.
Birkin Lotus Seven
A 1968 Lotus Seven Series 3 in very good condition would fetch in the region of £27,000/$45,000.
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