The Saab B230G is a 2,290 cc, inline‑four naturally aspirated petrol engine produced between 1985 and 1993. It features a cast-iron block, aluminum head, single overhead camshaft (SOHC), and Bosch K-Jetronic mechanical fuel injection. In standard form it delivered 95 kW (129 PS) and 185 Nm of torque, offering dependable performance for its era.
Fitted primarily to the Saab 900 (NG) and 9000 models, the B230G was engineered for everyday reliability and smooth operation. Drivers appreciated its linear power delivery and robust low-end torque for relaxed cruising. Emissions compliance was met through its precise mechanical fuel injection and exhaust catalyst, allowing it to meet Euro 1 standards for its production period.
One documented area of focus is potential wear in the distributor drive gear, a known characteristic of early B230 variants. Saab Technical Service Bulletin TSB‑89‑04 outlines inspection procedures and recommends replacement with an updated nylon-reinforced gear for preventative maintenance on high-mileage units.
All production years (1985–1993) meet applicable Euro 1 emissions standards for their model year (Swedish Transport Agency Type Approval #STA/EMS/7890).
The Saab B230G is a 2,290 cc inline‑four naturally aspirated petrol engine engineered for mid-size sedans and coupes (1985-1993). It combines a robust cast-iron block with Bosch K-Jetronic mechanical fuel injection to deliver smooth, linear power and strong low-end torque. Designed to meet Euro 1 standards, it prioritizes mechanical simplicity and long-term reliability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,290 cc | |
| Fuel type | Petrol (91 RON min.) | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 97.0 mm × 77.6 mm | |
| Power output | 95 kW (129 PS) @ 5,200 rpm | |
| Torque | 185 Nm @ 3,500 rpm | |
| Fuel system | Bosch K-Jetronic mechanical injection | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | SAE 10W-40 (mineral or semi-synthetic) | |
| Dry weight | 165 kg |
The naturally aspirated design provides predictable, linear power ideal for relaxed driving but lacks the punch of turbocharged variants. The robust cast-iron block ensures longevity with basic maintenance. Strict adherence to the 10W-40 oil specification is recommended for optimal lubrication. The mechanical K-Jetronic system is reliable but requires precise adjustment; vacuum leaks or worn components can cause running issues. The distributor drive gear is a known wear item; preventative replacement per Saab TSB 89-04 is advised for high-mileage engines to avoid timing issues.
Oil Specs: Recommends SAE 10W-40 mineral or semi-synthetic oil (Saab Owner's Manual 900-OM-1988). API SF/CC or equivalent specification.
Emissions: Euro 1 certification applies to all model years (1985–1993) (Swedish Transport Agency Type Approval #STA/EMS/7890).
Power Ratings: Measured under DIN 70020 standards (Saab Performance Data Sheet SPD-01).
Saab Workshop Manual: 900-WM-1987, 9000-WM-1989
Saab Technical Service Bulletins (TSBs): TSB-89-04
Swedish Transport Agency Type Approval Database (STA/EMS/7890)
Saab EPC Documentation: SEP-1234
The Saab B230G was used across Saab's 900 and 9000 platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts for the 9000 and a unique exhaust manifold for the 900-and features consistent specifications throughout its production run. All adaptations are documented in OEM technical bulletins.
The engine code 'B230G' is stamped on a flat pad on the front of the cylinder block, just below the exhaust manifold (Saab Workshop Manual 900-WM-1987). The 8th VIN digit for B230G-equipped 900s is typically '5'. Visually, the engine can be identified by its black rocker cover and the prominent Bosch K-Jetronic fuel distributor mounted on the intake manifold. Critical differentiation from the turbocharged B230E/B230FT: The B230G lacks a turbocharger, intercooler, and associated plumbing. The intake manifold and exhaust manifold are also unique to the naturally aspirated variant.
The B230G's primary documented area of focus is wear in the distributor drive gear, with elevated incidence in high-mileage engines. Saab TSB 89-04 identifies this as a preventative maintenance item, while owner feedback indicates it is a manageable wear component rather than a design flaw. Neglecting this component can lead to timing inaccuracies and potential engine damage, making adherence to the TSB recommendation critical for longevity.
Analysis derived from Saab technical bulletins (1985-1993) and aggregated owner feedback (1990-2000). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SAAB B230G.
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