The New Jaguar XJ 2.7 Diesel And 2006 XJ Range
Published: 27th August 2005
Jaguar XJ
The high-grade aluminium alloy cylinder heads are equipped with four valves per cylinder and double overhead camshafts. This combination provides optimum induction and exhaust actuation, with attendant benefits in performance and emissions. The cylinder head design includes a port deactivation system and pistons with toroidal combustion chambers, producing a highly efficient combustion capability. A low - by diesel standards - compression ratio of 17.3:1 contributes to improved emissions quality, quieter combustion and compatibility with the engine’s unique forced induction system. In a diesel engine, reduced compression means less heat build-up in the piston bowl and more efficient fuel burn, resulting in lower levels of pollutants.
A revised secondary bulkhead structure has been introduced to the engine compartment of all XJ models - both diesel and petrol - to reduce interior noise levels by up to 5 decibels. The result is the most refined vehicle in its class for interior comfort.
The XJ Diesel is also the quietest vehicle in its class for exterior noise, with the noise level measured by the Vehicle Cerification Agency being 7 decibels (A) lower than the EU legal limit for diesel vehicles. In order to achieve this, the exterior noise package has been significantly enhanced.
The XJ 2.7 litre twin-turbo Diesel is best-in-class for isolation from engine idle vibration. This is achieved with active engine mounts, which are introduced on all 2006 Model Year XJ Diesels and are an industry first. The engine mounts were designed and developed in conjunction with Avon Automotive. Diesel engines generate much greater levels of vibration than their petrol equivalents, which is why the mounts are being fitted to the XJ Diesel variants. Active mounts use an electronic control system and a powered mechanism to cancel an additional 90 percent of this engine vibration at idle.
A system that can cancel out in excess of 90 percent of engine idle vibration into the car has a huge impact on the vibration levels experienced by the vehicle occupants. This technology, in conjunction with the other noise, vibration and harshness (NVH) improvements, ensure that Jaguar delivers class-leading levels of refinement for the XJ's first ever diesel engine.
Significantly Lower Cost Of Ownership Than Rivals
During the development of the XJ 2.7 twin-turbo Diesel, Jaguar’s engineering team worked closely with our Customer Service Organisation to deliver excellent cost of ownership figures. The diesel-powered XJ benefits from an increased standard mileage service interval over the petrol models resulting in an approximate saving of 7 percent in routine maintenance costs over five years.
Against diesel competition - in the shape of the Mercedes S320 Cdi - the cost of routine maintenance is forecast to be an impressive 27 percent less for the XJ Diesel. Similarly, wear and tear index costs compared with the Audi A8 3.0 Tdi and Mercedes S320 CDi are forecast to be 25 and 28 percent lower respectively.
“Our new XJ diesel model is fast, refined and economical,” says Bibiana Boerio, managing director, Jaguar Cars. “And our customers will relish the fact that this is a luxury saloon that makes no compromises. We don’t ask them to trade performance for refinement or economy for power. This is a true Jaguar XJ, just like every other model in the range.”
Jaguar XJ
Our Jaguar XJ Guide lists the full specification of the current UK XJ range, including car prices, fuel consumption, dimensions and other vital data.
Price Range: £43,747 - £60,357
Body Style:
Fuel:
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Models in the range: 10
We have road tested the Jaguar XJ, to read our in-depth car reviews:
Jaguar XJ Review - Aug 2008
Jaguar XJ Review - Sep 2007
Our Car Buyer’s Guide covers all of the UK’s major new cars and includes CO2 ratings and car insurance groups. Data updated on the 21st Sep 2008
