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Lotus Lotus Cortina

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The Lotus Cortina: A Racing Legend for the Road

The Lotus Cortina, officially known as the Ford Cortina Lotus, is a high-performance version of the Ford Cortina Mark I, built between 1963 and 1970. A collaboration between Ford and Lotus, it combined Ford's mass-production expertise with Lotus's engineering prowess, creating a car that was both a successful road car and a dominant force on the racetrack. Classified as a compact sports sedan, it quickly gained a reputation for its exceptional handling, performance, and distinctive appearance.

Generations

Mark I (1963-1966)

  • Key Changes: The original Lotus Cortina featured a Lotus-modified 1,558 cc twin-cam engine derived from the Ford Kent block, a close-ratio gearbox, modified suspension, lightweight alloy body panels (doors, bonnet, and boot lid), and distinctive green stripes down a white body (although other color combinations were available later). The rear suspension initially used vertical coil springs, which proved troublesome.
  • Notable Features: Lotus engine, close-ratio gearbox, lightweight panels, distinctive styling.

Mark I Revised (1966-1967)

  • Key Changes: The problematic vertical coil spring rear suspension was replaced with a more conventional leaf spring arrangement. The alloy panels were changed to steel for improved durability and reduced production costs. The Lotus badge on the rear quarter panel was redesigned.
  • Notable Features: Improved rear suspension, steel body panels, updated badging.

Mark II (1967-1970)

  • Key Changes: Based on the Ford Cortina Mark II, the Lotus Cortina Mark II featured a similar engine and running gear to the Mark I, but with a more modern body shape. The interior was also updated. Production moved entirely to Ford's Dagenham plant.
  • Notable Features: Mark II Cortina body style, updated interior, Ford production.

Reliability & Common Issues

While the Lotus Cortina is a desirable classic, potential buyers should be aware of its inherent reliability challenges:

Engine

  • Twin-Cam Complexity: The Lotus twin-cam engine, while powerful, is more complex than standard Ford engines. It requires regular maintenance and careful tuning. Valve clearances are critical and must be checked frequently.
  • Oil Leaks: The engine is prone to oil leaks, particularly from the timing chain cover, rocker cover, and rear crankshaft seal.
  • Overheating: The cooling system can struggle to cope, especially in warmer climates or during enthusiastic driving. Radiator condition is crucial.

Gearbox

  • Close-Ratio Wear: The close-ratio gearbox, while contributing to the car's performance, is more susceptible to wear and tear. Synchromesh failure is common.
  • Difficult Shifting: Even when in good condition, the gearbox can feel notchy and require precise shifting technique.

Suspension

  • Rear Suspension Issues (Mark I): Early Mark I models suffered from the vertical coil spring rear suspension, which led to unpredictable handling. This was addressed with the introduction of leaf springs, but these can also sag over time.
  • Bushings and Ball Joints: The suspension bushings and ball joints are subject to wear and tear, affecting handling and ride quality.

Bodywork

  • Rust: Like all cars of this era, rust is a major concern. Check thoroughly for rust in the usual areas, including the sills, wheel arches, floor pans, and around the suspension mounts. The rear spring hangers are a particular weak point.
  • Panel Fit: Correct panel fit is important, especially on Mark I models where the aluminum panels can be easily damaged. Inconsistent gaps can indicate accident damage or poor repairs.

Electrical System

  • Lucas Electrics: The Lucas electrical system is notorious for its unreliability. Wiring can become brittle and corroded, leading to electrical faults.
  • Original Components: Many original electrical components are now difficult to source, so replacements may be required.

Driving Experience

The Lotus Cortina offers a unique and engaging driving experience. It's a car that demands attention and rewards skillful driving.

Pros:

  • Exceptional Handling: The Lotus Cortina's handling is legendary, thanks to its tuned suspension and lightweight construction. It feels nimble and responsive in corners.
  • Punchy Performance: The Lotus twin-cam engine provides strong performance, especially in the mid-range. The close-ratio gearbox allows for quick acceleration.
  • Iconic Styling: The Lotus Cortina's distinctive styling, particularly the green stripes, makes it instantly recognizable and highly desirable.
  • Direct Steering Feel: The steering is unassisted and provides excellent feedback, allowing the driver to feel connected to the road.

Cons:

  • Demanding to Drive: The car requires more skill and attention than modern cars. The unassisted steering can be heavy at low speeds, and the brakes require a firm foot.
  • Ride Quality: The ride is firm, which can be uncomfortable on long journeys.
  • Reliability Issues: As detailed above, the Lotus Cortina is prone to various mechanical issues, requiring regular maintenance and upkeep.
  • Limited Comfort: The interior is spartan and lacks many modern conveniences.

Buying Advice

Purchasing a Lotus Cortina requires careful consideration and research. Here's some advice for potential buyers:

Which Year to Look For:

  • Mark I Revised (1966-1967): These models offer the improved leaf spring rear suspension, addressing the handling issues of the earlier cars, while still retaining the desirable aluminum body panels.
  • Mark II (1967-1970): If you prefer the more modern styling of the Mark II Cortina, these models can be a good option. They are generally considered to be more reliable than the early Mark I cars due to the improved Ford production.

What to Avoid:

  • Extensively Modified Cars: While some modifications can be beneficial, avoid cars that have been heavily modified, as this can compromise their originality and reliability.
  • Cars with Significant Rust: Rust repair can be expensive and time-consuming. Avoid cars with extensive rust, especially in critical areas like the chassis and suspension mounts.
  • Cars with Poorly Maintained Engines: The Lotus twin-cam engine requires regular maintenance. Avoid cars where there is evidence of neglect or poor maintenance.
  • Cars without Provenance: A well-documented history is crucial. Cars with detailed service records and known ownership history are generally more desirable and command higher prices.

Important Checks:

  • Rust Inspection: Thoroughly inspect the bodywork for rust, paying particular attention to the sills, wheel arches, floor pans, and suspension mounts.
  • Engine Condition: Listen for any unusual noises from the engine, such as knocking or ticking. Check for oil leaks and excessive smoke from the exhaust.
  • Gearbox Operation: Test the gearbox thoroughly, paying attention to the ease of shifting and any signs of synchromesh wear.
  • Suspension and Steering: Check for excessive play in the steering and suspension. Listen for any noises from the suspension while driving.
  • Documentation: Verify the car's history and authenticity. Check for any matching numbers (engine, chassis, etc.).

The Lotus Cortina is a rewarding but demanding classic. With careful research and diligent maintenance, it can provide a thrilling and unique driving experience. Be prepared to invest time and money in its upkeep, but the rewards are well worth it for those who appreciate its iconic status and legendary performance.

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