It never ceases to amaze me just how many original parts and original unpublished accounts/documents still turn up for the XJ13/quad-cam engines after so many years. Recent discoveries have included a complete set of UNUSED inlet valves for the quad-cam heads as well as previously undiscovered photos taken at the time of the original build in 1965. I can add these items to the growing list of items that have surfaced - including an original-spec ZF "Dash 1" transaxle which was still in its crate from the 1960s. The transaxle is currently being rebuilt and will incorporate changes made by Jaguar for the original XJ13. This includes using a pair of ORIGINAL XJ13 driveshafts used on the XJ13 during its development. I need to research a little further but it is entirely possible these driveshafts were in place when David Hobbs set the UK closed-circuit record of 167.5mph in 1967.
The picture below shows the 1 7/8" "new-old-stock" inlet valves (in pride of place on a table in my living room - much to my wife's disgust ...)
"New-Old-Stock" V12 quad-cam prototype engine valves.
Two original high-resolution photos have recently come to light (the photos below are low-resolution for the web). They were taken during the build of the original in 1965 and give valuable details which will be faithfully incorporated in my recreation. The first shows the rear view of the monocoque and shows how the engine mounts were built up. A wooden "jig" can be seen which was used to locate the engine mounts. The left-hand sill is where the dry sump oil tank will sit. The large circular opening gives access to a rubber oil tank that sits inside the sill.
H1965/66 original XJ13 - rear monocoque
This second picture gives more detailed clues of the front monocoque construction. Note the similarity to the 1964 Lightweight E-Type.
H1965/66 original XJ13 - front monocoque
Here is a picture from a little while ago of the heads which will become the valves' new home. The heads have been stripped, thoroughly examined and skimmed by a few thou. Pressure-testing confirmed the heads' integrity. All guides are within tolerance and the valve seats were found to be securely fixed in place. The guides and seats will not be replaced although two exhaust valves (very slightly out of true) and all valve springs will be replaced.
Heads stripped for inspection.
How is the body coming on do I hear you say? Here is a sneak preview of the millimetre-perfect outer body as a digital image.
Body surfaces - 1966 XJ13 (as intended by Malcolm Sayer and as originally constructed)
The next picture shows how the digital model compares to the 1966 original. The most striking feature is how Malcolm Sayer's original XJ13 design in the wheelarch area follows a similar pattern to the D and E-Type (rather than the "1970's flared arches later added by Jaguar).
Body surfaces - compared against 1966 original.