Engine Jaguar AJ27S

The Jaguar AJ27S or 4.0 Supercharged 4.0-liter V8 engine was produced from 1999 to 2003 and was installed on charged modifications of the XKR coupe in the back of the X100 or the XJR sedan in the back of the X308. Unlike the atmospheric version, the power unit with a compressor does not have phase regulators.

AJ-V8 series: AJ126, AJ27, AJ27S, AJ28, AJ33, AJ33S, AJ34, AJ34S, AJ133, AJ133S.


Production years 1999-2003
Displacement, cc 3996
Fuel system distributed injection
Power output, hp 360 – 370
Torque output, Nm 505 – 525
Cylinder block aluminum V8
Block head aluminum 32v
Cylinder bore, mm 86
Piston stroke, mm 86
Compression ratio 8.9
Features DOHC
Hydraulic lifters no
Timing drive chain
Phase regulator no
Turbocharging Eaton M112
Recommended engine oil 5W-30
Engine oil capacity, liter 7.3
Fuel type petrol
Euro standards EURO 2/3
Fuel consumption, L/100 km (for Jaguar XKR 2000)
— city
— highway
— combined
Engine lifespan, km ~300 000

The engine was installed on:

  • Jaguar XJ 6 (X308) in 1999 – 2003;
  • Jaguar XK 1 (X100) in 1999 – 2002.

Disadvantages of the Jaguar AJ27S engine

  • The very first units came with a nikasil coating and were afraid of bad fuel;
  • But by the end of 1999, nikasil was replaced with more reliable cast-iron sleeves;
  • Another weak point of the motor is the plastic timing chain guides;
  • The aluminum engine does not tolerate overheating, keep the radiator clean;
  • As luck would have it, the pump is distinguished by low reliability, and pipes often burst.

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