Autobianchi Primula - Driveline

Driveline

Initially, the Primula was fitted with the 1221 cc engine from the Fiat 1100 D (for the coupé it was uprated to 65 hp (48 kW)), but in 1968 it was replaced with Fiat 124 engines—the berlinas received the 1197 cc 60 hp (45 kW) engine from the standard versions, while the coupé was fitted with the more powerful 1438 cc 70 hp (52 kW) unit. All engines used in the Primula had overhead valves (OHV)—the later twin cam derivative of the 1438 cc unit was not used in any Autobianchi (Fiat did use it later in the Lancia Beta- the issue at the time in a transverse installation of a twin-cam head being the arrangement of the exhaust manifold of the necessarily cross-flow head). Unlike contemporaneous BMC and Peugeot models, which had the transmission in the oil sump, the Primula had its manual transmission placed end-on, above the differential. The Primula also featured disc brakes on all four wheels, uncommon in small cars of the time.

The Primula's particular configuration of front wheel drive and transverse engine, but with a gearbox on the end of the engine, ingenious Fiat-designed clutch release mechanism and unequal length drive shafts, rather than a gearbox in the sump like the Mini, has become universal among front-drivers, as did its use of conventional steel suspension in almost all other cars except Citroens: usually McPherson struts at the front and a "dead" rear axle. The Primula is thus a car design of far greater significance than is often realised, as its design influence spread, far beyond even the mainstream high volume Fiats such as the 127 and the 128 of the late 1960s which used its driveline layout; to every front wheel drive transverse engined car in production today.