From E to S: first thoughts
The above design appears to be an evolution of the E-type 2+2.
Malcolm Sayer was put in charge of the E-type replacement, codenamed XJ21 and this is where the detective work starts...
Work on XJ21 seems to have begun in 1966. The first concept, a coupe, emerged in October 1966 with a 105 inch wheelbase, the same as the 2+2 E-type. Differences were limited to a 2-inch wider track, expanding that measurement to 52 inches. A further styling scheme emerged in January 1967 featuring a different nose, air intake and wider rear wings. Malcolm Sayer also designed a convertible version, and a further revised design followed in March 1967.
By 1967-68, Jaguar's forward product plans included no less than four sportscars. First on the list was a long wheelbase roadster powered by the 5.3-litre V12 - and the Jaguar curiosity, a 3.5-litre V8. This engine should not to be confused with the ex-GM/Rover V8 that in 1968, joined Jaguar as part of the British Leyland Motor Corporation line-up.
The Jaguar engine was a 60-degree V8 version of the V12, and Jaguar hoped that
it would replace the long-running XK. Unfortunately, Jaguar could never get the engine to perform to its satisfaction, probably because the ideal angle for a V8 engine is 90 degrees. Although Jaguar tested the V8 extensively, no photographs have yet emerged of the powerplant.
The next Jaguar sportscar was a two-seater coupe with flying buttresses, more of later, again with V8 and V12 power. There would also be a 2+2 version, essentially the same as the then current E-type, also with the aforementioned new engines. The fourth projected car was described as a 'four seater sports sedan'. Also known as the XJ 3-litre GT, this was a smaller car with a 96-inch wheelbase, distinctive twin headlamps and a truncated Kamm tail. Power was to come from the sadly underused 2.5-litre Daimler V8 or 3.5-litre Jaguar V8.
This product planning documentation implies that Jaguar planned to produce both XJ21 and what became the XJ-S.
On the 9th September 1968, Malcolm Sayer sent a memo to Jaguar boss Sir William Lyons. Sayer proposed a '2+2 sports based on XJ4 parts'. XJ4 was the codename for the new XJ6 saloon. In
it, Sayer opined: "The image sought after is of a low wide high speed car at least as eyecatching as those the Italians will produce, even if
it means sacrificing some of the more sensible values such as luggage and passenger space , silence, ease of entry."
Then on the 14th November, William Heynes sent a document to Sir William Lyons entitled the 'E-type Vehicle Project Plan'. Heynes argued that the forthcoming V12 engine should first be used in the E-type and then the XJ12 saloon. The design of the XJ21 was frozen in 1968, and Jaguar intended to produce
it in both 2+2 coupe and roadster. At this stage, the plan was to introduce the V12 E-type, codenamed XJ25 in January 1970, with the XJ21 to follow in February 1971. By this time, the V12 engine was running behind schedule, and the XJ25 did not appear until March 1971.
Time was running out for the XJ21, which had been on the verge of being ordered into production. Malcolm Sayer's new concept of an XJ saloon based 2+2 coupe gathered momentum. As Oliver Winterbottom, then working in Jaguar's styling department recalled, "The brief was that
it was a sports bodied XJ4 (XJ6) platform. We couldn't afford a brand new car - in fact, we had gone into BMH (the merger with BMC) because we couldn't afford the development of the XJ6. So the last thing anybody was going to be doing was developing totally new cars. I got involved in an alternative which was the XJ4 GT."
This was the point where XJ21 transformed into XJ27/28, and the XJ-S really began to take shape. Whereas the XJ21 had been based on the 1961 E-type, the altogether newer platform of the XJ saloon would underpin the XJ27/28. XJ27 was the codename given to the coupe and XJ28 to the roadster -
it was at this point that the V12 was chosen to be the prestigious new grand tourer's motive power.
Perhaps the demise of the XJ21 was fortuitous, for its E-type ancestry would have been exposed. Jaguar planned to make its GT more refined, yet cheaper than its most obvious rivals, but at an E-type busting price in order to make some real money.
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