The XJ6 4.2 came out with a number of features which were advanced at the time, and some which are advanced even today.
The engine is a double-overhead cam straight-six, with seven main bearings. The long stroke provides high torque, and a nearly flat torque curve.
Quad silencers reduce exhaust noise.
Massive forged steel crank, and polished connecting rod beams (unusual in a production car).
Cast pistons (quieter than forged, and don't expand as much, making tighter clearances possible).
Suspension and brakes
The suspension incorporates anti-dive geometry.
Despite not having ABS, the brakes are anti-lock in normal conditions.
There are disc brakes all round. The rear discs are inboard to reduce unsprung weight and to improve braking while cornering, as well as to reduce swing in the case of a faulty rear calliper.
The front brakes use 4-piston callipers.
The suspension is fully independent, with double wishbones all round, and several methods of reducing noise, vibration and harshness.
Structure and safety
The bodyshell is a strong monocoque, with bracing struts in the engine compartment.
Twin fuel tanks mounted vertically reduce fuel sloshing around, and provide a handy reserve.
The bumpers are very strong, and mounted on hydraulic struts to absorb impact.
The steering wheel collapses on impact.
Cool air for the carbs comes in via a metre-long trumpet routed from the front of the car.
Fuel is cooled by the climate control.
Instead of a simple aircon, a full climate control system is used.
Copyright © 2000 G R Adamson
Last updated: 23 May 2000