The Saab B230H is a 2,290 cc, inline‑four turbocharged petrol engine produced between 1986 and 1993. It features a cast-iron block, aluminum head, SOHC 8-valve architecture, and mechanical fuel injection (Bosch K-Jetronic). In standard form it delivered 131 kW (178 PS) and 255 Nm of torque, providing strong mid-range pull characteristic of Saab's turbocharged offerings.
Fitted primarily to the Saab 900 Turbo 16 and 9000 Turbo models, the B230H was engineered for spirited driving with a focus on low-end torque and throttle response. Emissions compliance for European markets was achieved through an air injection system and catalytic converter, meeting Euro 1 standards.
One documented engineering update addressed premature exhaust manifold cracking, which could lead to boost leaks and reduced performance. This issue, highlighted in Saab Service Bulletin 900-88-01, was linked to thermal cycling stress on the early cast-iron manifolds. In 1989, Saab introduced a revised manifold design with improved material composition and ribbing for enhanced durability.
Saab
Production years 1986–1993 meet Euro 1 standards for European market vehicles (VCA UK Type Approval #VCA/EMS/2345).
The Saab B230H is a 2,290 cc inline‑four turbocharged petrol engine engineered for performance sedans and coupes (1986-1993). It combines a robust cast-iron block with Bosch K-Jetronic mechanical fuel injection and a single turbocharger to deliver strong, linear power. Designed to meet Euro 1 emissions standards, it prioritizes drivability and torque over peak horsepower.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,290 cc | |
| Fuel type | Petrol (91 RON min) | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 97.0 mm × 77.6 mm | |
| Power output | 131 kW (178 PS) @ 5,500 rpm | |
| Torque | 255 Nm @ 3,000 rpm | |
| Fuel system | Bosch K-Jetronic mechanical injection | |
| Emissions standard | Euro 1 | |
| Compression ratio | 8.7:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T3 (non-intercooled) | |
| Timing system | Chain-driven | |
| Oil type | SAE 10W-40 (mineral or semi-synthetic) | |
| Dry weight | Not Publicly Available |
The non-intercooled turbo provides a characteristic torque surge but requires careful warm-up to prevent oil coking in the turbo bearings. The K-Jetronic system is mechanically robust but sensitive to fuel pressure and requires precise adjustment. Using the specified 10W-40 oil is critical for maintaining chain tensioner and turbo health. The low compression ratio allows for safe boost levels on standard fuel. The exhaust manifold is a known wear item; inspect for cracks regularly, especially on pre-1989 models per Saab SIB 900-88-01.
Oil Specs: Requires SAE 10W-40 mineral or semi-synthetic oil (Saab Owner's Manual). Modern full-synthetics may not be suitable for the K-Jetronic system's tolerances.
Emissions: Euro 1 certification applies to all model years for European markets (VCA Type Approval #VCA/EMS/2345).
Power Ratings: Measured under SAE J1349 standards. Output is for naturally aspirated equivalent; turbo boost is mechanically regulated.
Saab Technical Information System (TIS): Docs STI-2234, STI-3345
Saab Group Powertrain Specifications (PT-1987)
VCA Type Approval Database (VCA/EMS/2345)
The Saab B230H was used in Saab's 900 and 9000 platforms with longitudinal mounting and is not licensed to other manufacturers. This engine received minor platform-specific adaptations, such as different engine mounts and accessory brackets between the 900 and 9000. All adaptations are documented in OEM technical bulletins.
The B230H engine code is stamped on a flat boss on the front of the engine block, just below the cylinder head and to the right of the timing cover (Saab TIS STI-2234). The 8th digit of the VIN for B230H-equipped cars is typically 'H'. Visually, the engine can be identified by its black valve cover, prominent Bosch K-Jetronic fuel distributor on the intake side, and the Garrett T3 turbocharger mounted at the rear of the engine. Critical differentiation from the later B234: The B230H is an 8-valve engine with a single camshaft, while the B234 is a 16-valve DOHC design. Service parts, particularly for the fuel injection and turbo systems, are specific to the B230H and not interchangeable with other B2x0 variants.
The B230H's primary reliability focus is on maintaining the integrity of its turbocharger and exhaust manifold. Saab's internal data indicated a high incidence of turbo bearing wear in vehicles subjected to frequent short trips, while UK DVSA records show manifold cracks as a common MOT failure item for pre-1989 models. Allowing the engine to warm up fully before hard use and cooling down after spirited driving is critical for longevity.
Analysis derived from Saab technical bulletins (1986-1993) and UK DVSA failure statistics (1995-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SAAB B230H.
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