Saab(2).pdf

Technical Overview

Section 2 – Engine

Section 2

Engine

For model year 1999, the Saab 9-5 is available with two engine variants:

• a 2.3 liter 4-cylinder (B235) Light Pressure Turbo "Ecopower"

• a 3.0 liter 6-cylinder (B308) Light Pressure Turbo "Ecopower"

Note that the majority of the illustrations in this book refer to the 4-cylinder variant.

Section 2 – Engine

Technical Overview

4 Cylinder Engine

Compared with the engine fitted in Saab 900

and 9000 models, the 4-cylinder engine in the

Saab 9-5 has been extensively modified in

several respects.

The purpose of the modifications is to reduce

fuel consumption, improve emission control

efficiency and minimize vibration at low engine

rpm.

As a result of the above modifications, most of

the engine components are completely new.

Several repair methods and tightening torques

are also different from those used earlier. To

give an example, the balance shaft sprockets

are now secured by M8 bolts instead of the M 10

bolts previously fitted.

For model year 1999, the B235 engine produces

170 HP @ 5500 rpm and 208 ft.lbs. of torque at

1800 rpm.

Some of the more important changes are

described below:

• The compression ratio has been raised.

• The valves are lighter and the valve springs

softer.

• The cam times have been modified.

• The cylinder head gasket is of sheet metal.

• The connecting rods are longer and the

pistons lighter.

• The balance shafts are lighter and have new

chain sprockets.

• The engine block and timing cover are

lighter.

• The flywheel is heavier.

Technical Overview

Section 2 – Engine

6 Cylinder Engine

A 3.0 liter 6-cylinder (B308) Light Pressure

Turbo is offered as an optional engine in certain

9-5 models.

this turbocharger will pressurize air for all

cylinders, Saab refers to this design as

"asymmetrical" turbocharging.

This V6 engine utilizes one turbocharger

installed on the front exhaust manifold. Since

The B308 V6 engine produces 200 H.P. @ 5000

rpm and 228 ft.lbs. of torque at 2100 rpm.

Section 2 – Engine

Technical Overview

9-5 engine range - Model year 2000

Engine

B235E

B235R

B308E

Compression

9.3:1

Supercharging

Turbo / controlled by

engine management

system

Turbo / controlled by

engine management

system

Turbo

Wastegate

prestressing

2mm

Basic charging

pressure

0.40 +/- 0.03 Bar

0.45 +/- 0.03 Bar

0.40 +/- 0.03 Bar

Air Mass limit

“Pressure Guard”

1100 mg / combustion 1350 mg /

combustion

1000 mg / combustion

Maximum output

170 hp / 125 kW at

5500 rpm

230 hp / 169 kW at

5500 rpm

200 hp / 147 kW at

5000 rpm

Maximum torque

207 ft. lbs. at

1800 – 3500 rpm

258 ft. lbs. at

1900 – 3800 rpm

(manual trans.)

229 ft. lbs. at

2500 – 4500 rpm

243 ft. lbs. at

1900 – 4600 rpm

(automatic trans.)

Maximum speed

200 km/h (man. trans.)

240 km/h (man.)

230 km/h

(limited by engine

management system)

190 km/h (auto. trans.)

235 km/h (auto.)

(limited by engine

management system)

Acceleration

0 – 100 km/h

9.3 sec (man.)

7.7 sec (man.)

8.7 sec

10.5 sec (auto.)

8.1 sec (auto.)

Acceleration

60 – 100 km/h in

4 th gear

8.7 sec (man.)

6.9 sec (man.)

Engine

management

system

Trionic T7

Technical Overview

Section 2 – Engine

New engine B235R, 230 hp - Model year 2000

A new engine was introduced on the 9-5 from

model year 2000. Principally, the engine is a

modified 9-3 B235R (Viggen) basic engine.

Twin catalytic converters Improved fuel tank

integrity diagnosis

Certain diagnostic trouble codes (DTC) have

been added and others have been revised to

obtain a more reliable diagnosis.

The B235R delivers a torque of 350 Nm in the

engine speed range 1900 - 3800 rpm, but during

fast acceleration it is allowed to reach 370 Nm in

the same speed range. This function is called

"Over-boost" and is available on the B235R

engine with manual gearbox only. Cars with

B235R and automatic transmission deliver 330

Nm. In order to handle the increased torque, the

automatic gearbox has been reinforced, as it

could handle max. 310 Nm earlier.

All cars that fulfill the LEV requirements are

fitted with a new ignition discharge module.

The air-flushed injectors previously fitted have

been discontinued.

Exhaust valves are manufactured in nimonic

alloy to resist the thermal stress. They can be

identified by a 5 mm depression in the valve disc

similar to the Viggen.

Compared with the 9-3 B235R, model year

1999, certain modifications have been made to

the basic engine. New connecting rods with

trapezoid small ends have been introduced.

Note that the spark plugs are platinum NGK

PFR7 H-10. This type of spark plug must be

used only in the engine variants we recommend.

(B205L, B205R, and B235R)

A Mitsubishi TD04 turbocharger is fitted to

B235R engines (same as on the Viggen). This

has a greater capacity than the Garret GT-17

that was fitted on the B235E.

All B235R engines comply with environment

requirements for LEV (Low Emission Vehicle)

which means:

Note

The B235R should be driven on high octane fuel

to deliver the specified torque.

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