Going the distance

FORD modifies the six-cylinder engine to suit LPG. It uses hardened valves and valve seats, which are the main areas of concern with an LPG engine, and the heavier conrods from the XR6 Turbo engine. The LPG engine also has a higher compression, 10.7 to one compared with 9.7 for the petrol engine. Without the modifications, the experience in the field is that a normal petrol engine running a dual-fuel system from the aftermarket needs a head rebuild at about 100,000km.