06The D2’s petrol engine was a major upgrade of the alloy V8; its development programme was codenamed ‘Thor’. It had the 3950cc capacity of earlier derivatives, now known as the ‘4.0-litre’.
A big visual difference was a change to the inlet manifold. The original penthouse was replaced by a multiple long-tract arrangement designed to improve torque, an increase of nine per cent being claimed over a wider rev range. The BMW influence was revealed in the new Bosch Motronic engine management system while two twin ignition coils fed a new set of double-platinum spark plugs.
Refinement was improved by specifying crossbolted main bearing caps and a structural cast alloy sump. A new front end with multiple V-belts accommodated the wide range of ancillaries including a more powerful alternator, an aircon compressor and the ACE pump.
Not all the changes to the Thor V8 were under the skin – it was visually different with a new, long multiple-tract inlet manifold, a new front end and a new cast sump.