Start with what the Lotus Mark IX is: a Roadster with Coventry Climax 1098 cc, built from 1954 to 1955, at the height of the post-war boom. What it meant takes a little longer. The shape is credited to Colin Chapman.
The background
The Lotus Mark IX (1955) was an aluminium-bodied sports racing car manufactured by Lotus Engineering Ltd. About thirty of the Mark IX sports racing cars were made. It was closely related to the Lotus model Mark VIII (1954), of which only about seven cars were made. These cars were largely based on the innovative space frame of the Lotus Mark VI (1952). The highly aerodynamic bodies were designed by Frank Costin and constructed by Williams & Pritchard Limited. During this early era, of 1954–1955, Lotus Engineering was still a fledgling company, and cars were delivered in different states of completion on special orders. Similar to the Mark VIII, the Mark IX was available in various configurations and different engines, including the 1500 cc MG, 1500 cc Connaught and 2-litre Bristol were fitted. However, the Mark IX designation is most often powered by the 1100 cc Coventry Climax engine. Apparently, two models of Mark IX were offered – the "Club" and the "Le Mans", the latter of which had larger drum brakes fitted.
The chassis of the Mark IX was a new design, compared to that of the Mark VIII. Both were space frames of brazed steel tube. The new chassis was an advance over the Mark VIII in terms of the efficiency of its design and avoiding the VIII's need for diaphragm-stiffening panels. However, both chassis still used an oversized lower rail of 1.8-inch (5 cm) tube, a hang-over from the original design of the first Mark VI space frame. Compared to the Mark VIII, the Mark IX was shortened somewhat to a wheelbase of 7 feet 3.5 inches (2.22 m), and the body itself was about
The engineering
The engine is Coventry Climax 1098 cc. On the scales it comes to 1,080 lb. Drive goes through a Manual 4-speed (MGTF). The layout matters: a front engine drives the rear wheels, the classic proportion — long bonnet, cabin set back — that most people picture when they picture a sports saloon or a grand tourer. The wheelbase is 7 ft. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Where it sits
In the Lotus line-up the Lotus Mark IX has a clear place: it replaced the Lotus Mark VIII; it handed the line to the Lotus Eleven. The cars a buyer would have weighed it against include the Mercedes-Benz 300 SL, the Mercedes-Benz S-Class, the Chevrolet Corvette. Its Lotus stablemates include the Lotus 100T and the Lotus 101.
Owning one today
There is no federal ownership record for the Lotus Mark IX — it predates the complaint database or was never sold in the United States — so MotorJury publishes no running-cost figure for it. For a car of this age the price is set by the collector market and the condition of the individual example, not by a formula.