Fiat 500R (no, that doesn't stand for 'racing')

 
The final incarnation of the Fiat 500 was the R, and in many ways it was the ultimate evolution of the Fiat 500. There were substantial mechanical changes, including a new engine and gearbox, which was shared with the then-new Fiat 126. The two models would be sold alongside each other for three years, with the 500 providing the most stripped-out option for utilitarian transport. As a result, Fiat went back to basics with the R: the classic round speedometer returning after the L’s square dashboard. Mechanically, the 500R is the most modern-feeling car to drive, which has won it a lot of fans.
 
Production
The 500R was launched in 1972 and continued on sale until 1975, alongside the Fiat 126 that was intended to replace it. The R stands for ‘renewed’ and it was the most comprehensive mechanical reworking of the Fiat 500 throughout its history. A brand new engine arrived, with 594cc capacity, matched to a synchromesh gearbox for the first time. There were also better brakes, and the suspension was adjusted at the same time. The specification remained fixed throughout the lifespan of the model.
 
Engine
Number and type of cylinders: two cylinder vertical in-line (rear mounted)
Bore and stroke: 67.4mm × 70mm
Total displacement: 594cm3
Power and RPM: 18hp at 4000rpm
Compression ratio: 7.1:1
Distribution: overhead valves, chain driven side camshaft
Ignition: battery and distributor
Electrical system: 12 volts with 32Ah battery
Power supply: inverted Weber 26 IMB 10 carburettor
Lubrication: pressure with gear pump, centrifugal oil filter
Cooling: forced circulation air
 
Transmission and brakes
Clutch: single dry disc
Gearbox: four-speed plus reverse
Bevel gear ratio: 8/41
Transmission: rear-driven wheels
Rear axle: with independent wheels
Wheels: disc without slots
Tyres: 125R12
Shock absorbers: front and rear telescopic.
Suspensions: front, deformable wishbones, transversal leaf spring lower arms; rear, oblique triangulated wishbones, coil springs.
Brakes: hydraulic drum on four wheels.
 
Chassis
Chassis type: Integral with metal shell
Fully loaded weight: 845kg
Wheelbase: 1840mm
Tracks: front, 1121mm; rear, 1135mm
Height: 1325mm
Length: 2970mm
Width: 1320mm
Steering: screw and sector
 
‘Performance’ (if you can call it that)
Maximum speed: 100kph (62mph)
Fuel consumption: 5.5l/100km