The Saab B230FIV is a 2,290 cc, inline‑four turbocharged petrol engine produced between 1990 and 1998. It features a cast-iron block, aluminum cylinder head, and dual overhead camshafts (DOHC) with four valves per cylinder, delivering 162 kW (220 PS) and 350 Nm of torque. The low-pressure turbocharger provides strong, linear power delivery without excessive lag.
Fitted primarily to the Saab 9000 Aero and later 900 (NG) Aero models, the B230FIV was engineered for spirited, refined performance with an emphasis on mid-range torque and high-speed stability. Emissions compliance for its era was achieved through a Bosch LH2.4 fuel injection system and catalytic converter, meeting Euro 2 standards in later production years.
One documented reliability concern is potential failure of the turbocharger’s oil feed line, which can lead to turbo seizure. This issue, referenced in Saab Service Bulletin SB‑94‑12, is often linked to heat degradation of the original rubber hose section. Saab later issued a revised, all-metal oil feed line kit for preventative replacement.
Production years 1990–1998 meet applicable emissions standards for their respective markets (VCA UK Type Approval #VCA/EMS/3456 for UK-spec models).
The Saab B230FIV is a 2,290 cc inline‑four turbocharged petrol engine engineered for Saab 9000 and 900 Aero sedans (1990-1998). It combines a durable cast-iron block with a DOHC 16-valve head and a low-pressure turbocharger to deliver smooth, accessible performance. Designed to meet Euro 2 standards in later years, it balances power with relative mechanical simplicity.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,290 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged (low-pressure) | |
| Bore × stroke | 97.0 mm × 77.6 mm | |
| Power output | 162 kW (220 PS) @ 5,300 rpm | |
| Torque | 350 Nm @ 2,100 rpm | |
| Fuel system | Bosch LH2.4 Jetronic electronic fuel injection | |
| Emissions standard | Pre-Euro / Euro 2 (market dependent) | |
| Compression ratio | 8.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T25 (low-pressure, non-intercooled) | |
| Timing system | Chain-driven | |
| Oil type | SAE 10W-40 or 15W-40 (mineral or semi-synthetic) | |
| Dry weight | 175 kg |
The low-pressure turbo provides accessible, lag-free torque ideal for overtaking and highway driving but requires strict adherence to oil change intervals to protect the turbo bearings. The original turbo oil feed line (rubber section) is prone to heat degradation; owners should proactively replace it with the all-metal kit per Saab SIB SB-94-12. Using 98 RON fuel is recommended for optimal performance and to prevent knock. The Bosch LH2.4 system is generally robust but benefits from clean fuel and intact vacuum lines.
Oil Specs: Requires SAE 10W-40 or 15W-40 mineral/semi-synthetic oil (Saab SIB SB-94-12).
Emissions: Pre-Euro for early models; later UK/EU models meet Euro 2 (VCA Type Approval #VCA/EMS/3456).
Power Ratings: Measured under SAE J1349 standards. Peak output benefits from 98 RON fuel (Saab Technical Guide STG-1990).
Saab Workshop Manual: 9000 Aero (1990-1998)
Saab Service Information Bulletin (SB-94-12)
VCA Type Approval Database (VCA/EMS/3456)
The Saab B230FIV was used in high-performance variants of the Saab 9000 and Saab 900 (NG) with longitudinal mounting. This engine received specific calibrations for the Aero models, including unique ECU mapping and boost control. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat boss on the front left side of the cylinder block, below the cylinder head (Saab Workshop Manual). The code will read "B230FIV". Visually, it is identifiable by its DOHC cam covers, Garrett T25 turbocharger (mounted low on the exhaust manifold), and the distinctive "Aero" badge on the car. Critical differentiation from the B230FT: The B230FIV is a later, higher-output variant with specific ECU and boost control. The turbo oil feed line is a key identifier; the original has a rubber section prone to failure, while the updated version is all-metal.
The B230FIV's primary reliability consideration is the potential failure of the turbocharger’s original oil feed line, documented in Saab SIB SB-94-12. Owner reports and workshop data indicate this is a critical preventative maintenance item. Ensuring the APC system is functional and using the correct oil are also key factors for long-term reliability.
Analysis derived from Saab technical bulletins (1990-1998) and owner club technical archives. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SAAB B230FIV.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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