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Thursday, August 26, 2010
Just prior to World War II Jaguar, known then as SS Cars, started using a numbering system beginning with the letter X for internal projects. X meaning experimental, XB for military chassis projects and XF to XK for engines. This numbering system has never been consistent and there appears to be many omissions and duplications.
Number  Project
XJ3  3.4-litre and 3.8-litre S-Type saloon cars (known to the Pressed Steel Company as 'Utah')
XJ4  Designation of the project which led to what was publicly announced as the XJ6
XJ5  Modifications to the Mark Ten for air-conditioning
XJ6  A V12 racing engine with four-overhead-camshafts
XJ8  E-type 2+2 version
XJ13  Jaguar sport-racing mid engined prototype
XJ16  Jaguar 420 saloon
XJ22 & XJ23  E-type Series Two
XJ27  The Jaguar XJS
XJ40  Second Generation Jaguar XJ6 (1986-1994) (as opposed to Series 2 version of First Generation)
XJ41  Prototype Coupé replacement for the XJ-S
XJ42  Prototype Drophead replacement for the XJ-S
XJ50  Jaguar XJ12 Series Three
XJ57 & XJ58  Jaguar XJ-S 3.6 litre
XJ81  Second Generation Jaguar XJ12 (1993 - 1994)
Jaguar XJ
Jaguar XJ
Jaguar XJ
Jaguar XJ
Jaguar XJ
Jaguar XJ
Jaguar XJ
Jaguar XJ
Jaguar XJ
Jaguar XJ
Jaguar XJ
Jaguar XJ
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