Monday 21st May 2018,
Inopian

Jaguar XJ6 & XJ12 Series I 1968-1973: Fastest Saloon of 1972

Our subject car is the Jaguar XJ6, the first model of a car that is still thriving today. The XJ is the only Jaguar model that is still being produced, albeit in a much updated form, that bears the name of it’s grandfather from almost 50 years ago. The Jaguar XJ6 is, today, a fine example of a classic British luxury car.

In 1968 British Leyland pulled back from their policy of interference in Jaguar design and planning to allow Bill Lyons a free hand in designing the Jaguar XJ6. The British motor industry was by now suffering serious problems, many of which were directly attributable to British Leyland itself. In the long term this would result in the collapse of the industry infrastructure. Short term it affected build-quality and reliability of new models. Lyons retired about this time and Jaguar struggled to maintain standards. The Jaguar XJ6 Series 1 was a fine car, worthy of the Jaguar name although beset with a plethora of minor problems due to factory attitudes and practices.

In 1969 the Daimler Sovereign 4.2 arrived as `top of the range`. Both the Jaguar and Daimler versions were available with 4.2 or 2.8 XK engines. Targeted mainly at the European market, the engines suffered from a shortage of power and would be replaced later by much higher spec motors.

All models had power-steering and leather as standard with air-conditioning optional on 4.2 models. Twin 10 gallon fuel tanks were also retained from the earlier Jaguar MKX and 420G models. In 1972 the long wheel-base (LWB) version became an option so that the rear-seat passengers could stretch their legs easily.

In July 1972 the XJ12 was announced. This used the 5.3 litre V12 engine version straight out of the E-type. Available only in automatic form it was the fastest four-seater in the world at that time reaching a top speed of 147 mph. Jaguar had always intended to use the V12 in the XJ but when it was fitted the company struggled to find room under the bonnet for it. Cooling was a major problem. However, they worked out the difficulties and thankfully today we can enjoy the classic lines of a top luxury saloon with performance approaching that of the mighty V12 E-type. The Daimler V12 version arrived at the same time, and was called the `Double-Six`.

Jaguar XJ Series 1 SWB 1968-1973 Specs
 
Body Type4 seater saloon
Engine PlacementFront
Drive TypeRear wheel drive
Brakes
FrontDiscs
RearDiscs
Dimensionsmminches
Length4816189.6
Width177269.8
Height134352.9
Wheelbase2765108.9
Cargo Volume481 L17 cu. Ft.
Engine2.8 DOHC Jaguar XK 12V Hemispherical
Cylindersstraight 6
Displacement2792 cc170.4 cui
Power104 Kw140 bhp5200 RPM
Torque203 Nm150 ft. lb4300 RPM
Power/weight91 bhp/t
FuelPetrol
Top Speed180 km/h112 mph
Acceleration0-100 km/h - 0-60 mph14 s
Fuel consumptionl/100 kmImperial mpg
Urban16.816.8
Extra-urban8.632.8
Combined12.722.2
Gearbox4 speed manual3 speed automatic
Weight1537 kg3389 lb
Engine2.8 DOHC Jaguar XK 12V Hemispherical
Cylindersstraight 6
Displacement2792 cc170.4 cui
Power134 Kw180 bhp6000 RPM
Torque335 Nm247 ft. lb3750 RPM
Power/weight117 bhp/t
FuelPetrol
Top Speed193 km/h120 mph
Acceleration0-100 km/h - 0-60 mph11.4 s
Fuel consumptionl/100 kmImperial mpg
Urban17.316.3
Extra-urban9.131
Combined13.221.4
Gearbox4 speed manual3 speed automatic
Weight1537 kg3389 lb
Engine4.2 DOHC Jaguar XK 12V Hemispherical
Cylindersstraight 6
Displacement4235 cc258.4 cui
Power183 Kw245 bhp5400 RPM
Torque384 Nm283 ft. lb3800 RPM
Power/weight146 bhp/t
FuelPetrol
Top Speed204 km/h127 mph
Acceleration0-100 km/h - 0-60 mph9.2 s
Fuel consumptionl/100 kmImperial mpg
Urban19.614.4
Extra-urban11.424.8
Combined15.518.2
Gearbox4 speed manual3 speed automatic
Weight1680 kg3704 lb
Engine5.3 SOHC 24V (1972-1973)
CylindersV12
Displacement5344 cc326.1 cui
Power198 Kw265 bhp6000 RPM
Torque409 Nm302 ft. lb3500 RPM
Power/weight158 bhp/t
FuelPetrol
Top Speed225 km/h140 mph
Acceleration0-100 km/h - 0-60 mph8.4 s
Fuel consumptionl/100 kmImperial mpg
Urban21.213.3
Extra-urban1518.8
Combined18.115.6
Gearbox3 speed automatic
Weight1680 kg3704 lb
Engine5.3 SOHC 24V (1972-1973)
CylindersV12
Displacement5344 cc326.1 cui
Power220 Kw295 bhp5500 RPM
Torque433 Nm319 ft. lb3300 RPM
Power/weight176 bhp/t
FuelPetrol
Top Speed237 km/h147 mph
Acceleration0-100 km/h - 0-60 mph8.1 s
Fuel consumptionl/100 kmImperial mpg
Urban21.513.1
Extra-urban15.318.5
Combined18.415.4
Gearbox3 speed automatic
Weight1680 kg3704 lb
Jaguar XJ Series 1 LWB 1972-1973 Specs
Body Type4 seater saloon
Engine PlacementFront
Drive TypeRear wheel drive
Brakes
FrontDiscs
RearDiscs
Dimensionsmminches
Length4947194.8
Width177269.8
Height137254
Wheelbase2865112.8
Cargo Volume481 L17 cu. Ft.
Engine2.8 DOHC Jaguar XK 12V Hemispherical
Cylindersstraight 6
Displacement2792 cc170.4 cui
Power104 Kw140 bhp5200 RPM
Torque203 Nm150 ft. lb4300 RPM
Power/weight75 bhp/t
FuelPetrol
Top Speed174 km/h108 mph
Acceleration0-100 km/h - 0-60 mph15.6 s
Fuel consumptionl/100 kmImperial mpg
Urban17.416.2
Extra-urban10.227.7
Combined13.321.2
Gearbox4 speed manual3 speed automatic
Weight1870 kg4123 lb
Engine2.8 DOHC Jaguar XK 12V Hemispherical
Cylindersstraight 6
Displacement2792 cc170.4 cui
Power134 Kw180 bhp6000 RPM
Torque335 Nm247 ft. lb3750 RPM
Power/weight96 bhp/t
FuelPetrol
Top Speed180 km/h112 mph
Acceleration0-100 km/h - 0-60 mph13 s
Fuel consumptionl/100 kmImperial mpg
Urban17.316.3
Extra-urban9.131
Combined13.221.4
Gearbox4 speed manual3 speed automatic
Weight1870 kg4123 lb
Engine4.2 DOHC Jaguar XK 12V Hemispherical
Cylindersstraight 6
Displacement4235 cc258.4 cui
Power183 Kw245 bhp5400 RPM
Torque384 Nm283 ft. lb3800 RPM
Power/weight131 bhp/t
FuelPetrol
Top Speed198 km/h123 mph
Acceleration0-100 km/h - 0-60 mph10.8 s
Fuel consumptionl/100 kmImperial mpg
Urban19.914.2
Extra-urban11.724.1
Combined15.817.9
Gearbox4 speed manual3 speed automatic
Weight1870 kg4123 lb
Engine5.3 SOHC 24V
CylindersV12
Displacement5344 cc326.1 cui
Power198 Kw265 bhp6000 RPM
Torque409 Nm302 ft. lb3500 RPM
Power/weight137 bhp/t
FuelPetrol
Top Speed219 km/h136 mph
Acceleration0-100 km/h - 0-60 mph10 s
Fuel consumptionl/100 kmImperial mpg
Urban21.513.1
Extra-urban15.318.5
Combined18.415.4
Gearbox3 speed automatic
Weight1930 kg4255 lb
Engine5.3 SOHC 24V
CylindersV12
Displacement5344 cc326.1 cui
Power220 Kw295 bhp5500 RPM
Torque433 Nm319 ft. lb3300 RPM
Power/weight153 bhp/t
FuelPetrol
Top Speed230 km/h143 mph
Acceleration0-100 km/h - 0-60 mph9.7 s
Fuel consumptionl/100 kmImperial mpg
Urban21.813
Extra-urban15.618.1
Combined18.715.1
Gearbox3 speed automatic
Weight1930 kg4255 lb
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Jaguar XJ6 & XJ12 Series I 1968-1973: Fastest Saloon of 1972, 9.9 out of 10 based on 7 ratings
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About Bev Roberts

Speed, the smell of hot oil, the roar of a straight-through exhaust and the scream of an engine at max revolutions. They have all been a large part of my life for almost 50 years. It is time to share my experiences with you, dear reader. Do you want to know more? Read on through my `Full Bio` and many articles.

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I was born in Hereford UK in 1948 and brought up in Gloucester UK. I played Rugby football internationally as a schoolboy. At the age of 17, a new and wet driving license in my paw, I entered motor racing. I was supported and financed by my parents and so my journey began.

In 1965 I bought a 1293cc Mini-Cooper `S` and campaigned it for a season. Having quickly made some good friends in the racing fraternity, several interesting opportunities came my way. I joined a sports-car team and raced in the Le Mans 24 hours in 1968 and 1969 in a Lola T70. Mechanical failure defeated both efforts. During that period I owned and raced a `D type` Jaguar and an AC Cobra. In those days cars like that were available and not too expensive, now they reside in museums and private collections. I had a chain of interesting cars through my youth including Jaguars, Minis, Mustangs and Lotus-Cortinas.

As a young driver I had my share of accidents too. Often the car would only be worth scrap-metal value by the time I got it home! I worked for an Aston-Martin/Jaguar dealership for a while, which enhanced my experience and gave me the opportunity to sample some very exotic machines, Ferrari, Facel-Vega, Iso and Maserati to recall a few of them.

At the end of 1969 I moved to South Africa to work on my uncle`s farm but the S.A. government had other ideas and drafted me into the army. After five years had passed I was thanked and released from the service. While I was there I bought a beige Cadillac Eldorado, previously the property of Marilyn Monroe. While I was away on a patrol my girlfriend had it re-sprayed pink! I was unimpressed by both the joke and the bill for the work!

When I returned to UK in 1974 I left it behind. On my return I found that the once-mighty British motor industry was in decline and was headed for oblivion. Motor racing was now very expensive so I turned to commercial transport. Driving large trucks gave me freedom and a chance to see some of the world. I don`t remember ever making a career choice but for the next thirty years a truck was my home. For about ten years in that period I owned two trucks of my own.

I also owned a famous MGB-GT, known as `Lucky`. If you`d like to read `The Story of Lucky` there is an article in Inopian`s archive. I finally retired, due to ill-health, in 2008. Since I had varied knowledge and many experiences on our subject I decided to share the stories of the cars I enjoyed (and hated) with the new generation.

Enjoy Inopian… it is constructed and written for you.

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