Lotus 20 was a Formula Junior

Formula Junior

Formula Junior is an open wheel formula racing class first adopted in October 1958 by the CSI . The class was intended to provide an entry level class where you could use inexpensive mechanical components from ordinary automobiles...

 car built by Lotus

Team Lotus

Team Lotus was the motorsport sister company of English sports car manufacturer Lotus Cars. The team ran cars in many motorsport series including Formula One, Formula Two, Formula Ford, Formula Junior, IndyCar and sports car racing...

 for the 1962 season as a successor to the Lotus 18

Lotus 18

The Lotus 18 was a race car designed by Colin Chapman for use by Lotus in Formula Junior, Formula Two, and Formula One. It was the first mid-engined car built by Lotus and was a marked improvement over Chapman's early and only moderately successful front-engined formula cars, the 12 and 16. It was...

.

The chassis was a spaceframe, clothed in fibreglass bodywork. It had front double wishbone suspension, but the rear had a lower wishbone with the driveshaft being fixed length and therefore used as a top link. Originally fitted with Alfin drum brake

Drum brake

A drum brake is a brake in which the friction is caused by a set of shoes or pads that press against a rotating drum-shaped part called a brake drum....

s at all four corners, it was soon upgraded to disc

Disc brake

The disc brake or disk brake is a device for slowing or stopping the rotation of a wheel while it is in motion.A brake disc is usually made of cast iron, but may in some cases be made of composites such as reinforced carbon–carbon or ceramic matrix composites. This is connected to the wheel and/or...

s in front and inboard drums at the rear. Equipped as standard with the Ford MAE engine and with either a Renault

Renault

Renault S.A. is a French automaker producing cars, vans, and in the past, autorail vehicles, trucks, tractors, vans and also buses/coaches. Its alliance with Nissan makes it the world's third largest automaker...

 Dauphine

Renault Dauphine

Renault Dauphine is a rear-engined economy car manufactured by Renault in one body style — a three-box, four-door sedan — as the successor to the Renault 4CV, with over two million examples marketed worldwide during its production from 1956-1967....

 gearbox or Hewland

Hewland

Founded by Mike Hewland in 1957, Hewland is a British engineering company specialising in racing-car gearboxes. Hewland was the first company to manufacture a bespoke racing-car gearbox....

-modified VW

Volkswagen

Volkswagen is a German automobile manufacturer and is the original and biggest-selling marque of the Volkswagen Group, which now also owns the Audi, Bentley, Bugatti, Lamborghini, SEAT, and Škoda marques and the truck manufacturer Scania.Volkswagen means "people's car" in German, where it is...

 box.

Compared to the Lotus 18, the 20 had a much reduced frontal area and lower centre of gravity, aided by the fact the driving position was reclined so the driver was nearly lying down, compared to being nearly upright in the Lotus 18.

Lotus 20B

The 20B was the same as the 20, but with sway bar

Sway bar

A sway bar or anti-roll bar or stabilizer bar is a part of an automobile suspension that helps reduce the roll of a vehicle that is induced by cornering or road irregularities. It connects opposite wheels together through short lever arms linked by a torsion spring...

 and stock inboard drum brakes in the rear. Occasionally, 20Bs ran with other engines, such as a Lotus Twin Cam, and therefore didn't race as a Formula Junior, but in other series such as the Tasman series