Jaguar XJS V12 racing car

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Stilldrillin:
Nice to see more of your waxworks, Ade! :thumbup:

Wax flywheel, perhaps? :smart:

David D

AdeV:
The time has come to bite the damn bullet and strip the engine down to its component parts for thorough cleaning, measuring, etc.

First off, "B" bank cam, cam carrier, and head is removed. This operation goes surprisingly easily - I was expecting a bigger fight from the head, in the end it virtually popped off all by itself. The interior of the engine is dirty, and has collected a fair amount of debris, kind of what I expected really. Everything seems to be in relatively good order though, although I have yet to measure everything & check for warpage, etc. A good soak in solvent plus some vigorous scrubbing is bringing the parts up like new (no photos of the clean stuff yet).

AdeV:
Stripping "A" bank revealed a bit of a problem... No 2A has had a small washer - about 1/2" diameter - banging around in the combustion chamber for an unknown period of time. The piston has taken the brunt of the beating, but there's some damage to the head as well. Hopefully, it's all repairable with a TIG welder, some filler rods, and someone with a decent surface grinder.

AdeV:
So... strip-down wise, there's not a lot left. All the studs came out - eventually, and in one piece - unlike my Halfrauds stud extractor set which balked at the 2nd head stud! Thank goodness for the rather more robust Draper unit, although that has its frustrations; it has a tendancy to come apart into its constituent components as you try to free the now jammed in stud. Hey ho.

So... sump to come off, oil pump, rods & pistons out, main caps off, crank out, liners out, and then we can begin cleaning & measuring the block...

What is coming out: 5.3 litre spec liners, pistons, rods, crankshaft.
What's going in: 6mm bigger liners (96 vs 90mm), same rods, new shorter pistons, 6 litre crankshaft.

The crankshaft will give me an extra 8.5mm stroke, the bore an extra 6mm diameter, all told I should end up with an engine that displaces 6.8 litres (416in3) and - if I can get the volumetric efficiency up where I need it, I should see north of 600bhp and 480lbs/ft torque...

There's not a lot of machining involved in the next bit of the engine build, but there is quite a lot of expenditure (the pistons are the big ticket item, and I expect them to cost around £2000 (US$3000)), which is going to slow me down a bit...

vtsteam:
Ouch, and it would be a hardened spring washer, too. Looks in perfect shape! You're doing a great job here. Nice to see this car coming back to former glory. Well surpassing it at some point. :thumbup: :bow:

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