Produced between 1999 and 2003, the Jaguar AJ27S, also known as the 4.0 Supercharged 4.0-liter V8 engine, was fitted to charged versions of the XKR coupe in the rear of the X100 or the XJR sedan in the rear of the X308. Phase regulators are absent from the power unit with a compressor, in contrast to the atmospheric version.
AJ-V8 series: AJ126, AJ27, AJ27S, AJ28, AJ33, AJ33S, AJ34, AJ34S, AJ133, and AJ133S.
Specifications
| 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 |
16.7 8.3 11.3 |
| 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
By the end of 1999, more dependable cast-iron sleeves had taken the place of the initial units’ nikasil coating, which was due to concerns about defective fuel.
The motor’s plastic timing chain guides are another weak point.
Keep the radiator clean because the aluminum engine cannot withstand overheating;
As fate would have it, pipes frequently burst and the pump is known for its poor dependability.