Fiat 128 Original Italian Generation Rally 1290 cc SOHC Engine
The Fiat 128 Rally used a 1290 cc single-overhead-camshaft four-cylinder engine. Its quoted 67 hp output distinguishes this sporting saloon application from the 75 hp Sport Coupé.
The Rally’s enlarged SOHC engine
This engine record belongs to the Fiat 128 Rally, the two-door sporting saloon introduced in March 1971 within the original Italian generation. Its enlarged engine retained the 128’s transverse installation and front-wheel-drive layout.
Stellantis identifies Rivalta as the starting point of Italian 128 production; this does not establish a separate engine-manufacturing location. Stellantis Heritage.
Documented engine specification
The original homologation form records a water-cooled inline four with 1290 cc displacement, an 86 mm bore and 55.5 mm stroke. It specifies a cast-iron cylinder block, aluminium-alloy cylinder head and 8.9:1 compression ratio.
A toothed belt drives the single overhead camshaft. Each cylinder has one inlet and one exhaust valve; the documented induction system uses one Weber 32 DMTR twin-choke downdraught carburettor. These specifications describe the original homologated configuration, not every subsequent competition modification or export specification. FIA homologation form 5415, printed pages 5–6.
Rally and Sport Coupé tunes
Stellantis quotes 67 hp for the Rally and 75 hp for the 1290 cc Sport Coupé introduced in November 1971. These figures retain the source’s terminology without assuming a measurement standard. Shared displacement does not make the two applications interchangeable.
The Rally engine’s historical role was to give the practical saloon a sporting identity while leaving the higher-output position to the coupé. Manufacturer history.
Production and homologation chronology
The original homologation form states that construction of the documented Rally model began on 30 December 1970, preceding its public introduction. This is a vehicle-production milestone, not proof of the first engine’s manufacture or a market-specific model year. Original form, printed page 1.
The FIA catalogue identifies an Italian, four-cylinder, front-wheel-drive car under Group 1 homologation 5415. It lists homologation from 2 July 1971 to 1 January 1981. The original form instead gives validity from 1 July 1971; the one-day discrepancy is retained. Neither expiry date establishes the end of manufacture.
The catalogue also lists extensions concerning the engine, camshaft, carburettor, crankshaft and connecting rod. These document approved homologation developments and must not be applied indiscriminately to standard road cars. A final production date for this Rally-specific engine application is not established by the cited evidence. The parent generation’s wider production span must not be substituted.
Fiat 128 Original Italian Generation Rally
Parent variant record covering the two-door saloon’s bodywork, equipment and wider historical context.