The Fiat 100 GF 000 is a 1,297 cc, inline-four naturally aspirated petrol engine produced between 1982 and 1988. It features a SOHC valvetrain with two valves per cylinder and carburetted fuel delivery, delivering 40 kW (55 PS) at 5,200 rpm and 96 Nm of torque at 3,000 rpm. This compact engine was designed for lightweight urban mobility, offering simplicity, ease of maintenance, and fuel-efficient operation in entry-level applications.
Fitted primarily to the Fiat Uno 45 S and 45 SX models, the 100 GF 000 was engineered for economical city driving with low mechanical complexity. It met Euro 1 emissions standards through a catalytic converter and lambda sensor introduced in 1986, allowing compliance in key European markets. Its transverse mounting and front-wheel-drive layout maximized cabin space while minimizing mechanical losses.
One documented update occurred in 1986 with the introduction of catalytic converter and oxygen sensor on Italian and German market variants, transitioning from pre-cat emission control. This revision, detailed in Fiat Service Information Bulletin 86/07, improved emissions output without altering power figures. No internal mechanical changes were made during its production run, as confirmed in Fiat Technical Bulletin TB-UNO-01.
Production years 1982–1985 meet pre-cat emission standards; 1986–1988 models meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/2044).
The Fiat 100 GF 000 is a 1,297 cc inline-four petrol engine engineered for compact urban vehicles (1982–1988). It combines carburetted fuel delivery with SOHC valvetrain to deliver economical performance and ease of service. Designed to meet evolving emissions standards, it balances affordability with city drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,297 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 76.0 mm × 71.0 mm | |
| Power output | 40 kW (55 PS) @ 5,200 rpm | |
| Torque | 96 Nm @ 3,000 rpm | |
| Fuel system | Weber 32/34 DCEL carburettor | |
| Emissions standard | Pre-cat (1982–1985), Euro 1 (1986–1988) | |
| Compression ratio | 9.2:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Single overhead camshaft, toothed belt-driven | |
| Oil type | SAE 10W-40 (API SE/CC) | |
| Dry weight | 98 kg |
The carburetted inline-four provides predictable low-RPM drivability ideal for city use but requires adherence to 15,000 km or annual maintenance intervals to ensure valve train longevity. SAE 10W-40 oil meeting API SE/CC standards is essential due to older engine design and lower shear stability requirements. The timing belt should be replaced every 60,000 km or 5 years to prevent interference-related damage. Fuel quality of at least 95 RON is required to prevent knock and maintain idle stability. Post-1986 models benefit from catalytic converter monitoring per Fiat SIB 86/07 to avoid lambda sensor coking.
Oil Specs: Requires SAE 10W-40 (API SE/CC) as specified in Fiat SIB 82 04 01. Compatible with modern API SL/CF oils if used with upgraded valve seals.
Emissions: Euro 1 certification applies to 1986–1988 models only (VCA Type Approval #VCA/EMS/2044). Pre-cat models not compliant with Euro 1.
Power Ratings: Measured under ISO 1585 standards. Output verified on chassis dynamometer per Fiat Factory Test Protocol FTP-100GF-01.
Fiat Technical Information System (TIS): Docs 100GF000-TECH-01, 100GF000-TIMING-01, SIB 82 04 01
VCA Type Approval Database (VCA/EMS/2044)
ISO 1585: Road vehicles — Test method for the measurement of fuel consumption
The Fiat 100 GF 000 was used across Fiat's Uno platform with transverse mounting and no external licensing. This engine received minor tuning adaptations for the 45 S and 45 SX trims, with the latter featuring revised carburettor jetting and exhaust tuning for improved throttle response. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the right-side engine block near the transmission mount (Fiat TIS 100GF-ID-01). The 8th VIN digit indicates engine type ('B' for 100 GF series). The 45 S and 45 SX share identical engine blocks; differentiation is based on carburettor configuration and ECU (if fitted). The 45 SX model uses a slightly larger main jet in the Weber 32/34 DCEL carburettor. Service parts are generally interchangeable, but lambda sensors and catalytic converters must be matched to model year per Fiat SIB 86/07.
The 100 GF 000's primary reliability risk is timing belt failure in high-mileage applications, with elevated incidence in vehicles with delayed maintenance. Internal Fiat service data from 1990 reported belt-related faults in approximately 4% of units beyond 60,000 km, while UK DVSA MOT records show a moderate rise in emissions failures linked to lambda sensor degradation. Sustained urban use and infrequent servicing increase stress on belts and sensors, making timely inspection and correct oil use critical.
Analysis derived from Fiat technical bulletins (1982-1988) and UK DVSA failure statistics (1989-1998). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FIAT 100-GF-000.
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