ENGINE 3.9 V8i

ENGINE TUNING DATA

1

INFORMATION

ENGINE 3.9 V8i

Type

3.9 Litre V8i

.................................................................................

Firing order

1-8-4-3-6-5-7-2

.....................................................................

Cylinder Numbers
Left bank

1-3-5-7

..........................................................................

Right bank

2-4-6-8

........................................................................

No 1 Cylinder location

Pulley end of left bank

...................................................

Timing marks

On crankshaft vibration damper

..................................................................

Spark plugs
Make/type(8.13:1 Compression)

Champion RN11YCC

......................................

Gap

0.84-0.96mm

..................................................................................

Make/type(9.35:1 Compression)

Champion RN11YCC

......................................

Gap

0.84-0.96mm

..................................................................................

Coil
Make/type

Bosch 0-221-122-392,

........................................................................

Compression ratio

8.13:1 or 9.35:1

.........................................................

Fuel injection system

Lucas 14 CUX Hot-wire air flow sensor system

.....................................................

electronically controlled

Valve Timing

Inlet

Exhaust

Opens

32

°

BTDC

..............................................................................

70

°

BBDC

Closes

73

°

ABDC

..............................................................................

35

°

ATDC

Duration

285

°

...........................................................................

285

°

Valve peak

104

°

ATDC

.......................................................................

114

°

BTDC

Idle speed - controlled by MFI system
- all loads off in neutral

665 to 735 rev/min

.....................................................

- auto gearbox in gear, air con operating

650

±

28 rev/min

.........................

- auto gearbox in gear, air con off

600

±

28 rev/min

....................................

- manual gearbox

700

±

28 rev/min

.............................................................

- manual gearbox, air con operating

750

±

28 rev/min

................................

Base idle speed

525

±

25 rev/min

See FUEL SYSTEM, Fault

..............................................................

diagnosis, Base idle speed setting.

Ignition Timing - dynamic at 800 rev/min max,
vacuum disconnected
8.13:1 compression, non catalyst

2

°

BTDC

±

1

°

.....................................

9.35:1 compression, non catalyst

4

°

BTDC

±

1

°

.....................................

9.35:1 compression, catalyst

5

°

BTDC

±

1

°

............................................

Exhaust gas
CO content at idle

0.5 to 1.0% max.

............................................................