Posts Tagged ‘MG EX181’

(Theo Page)

Perhaps MG saved the best till last?

EX181 was the marque’s final record breaker, which commenced with the 1930/1 EX120…

The famous company, in part built its brand very cost effectively by setting a number of Land Speed Records down the decades. Stirling Moss did 245.64 mph and 245.11 mph for the flying kilometre and flying mile respectively in August 1957, and Phil Hill 254.91 mph and 254.53 mph over the same distances in October 1959 with EX181’s engine increased in capacity from 1489cc to 1506cc- this allowed the sneaky Brits to bag both under 1500cc and under 2000cc records, both at Bonneville.

Twin inlets in the cars nose pushed air thru ducts either side of the driver and flow to the radiators, carb inlets, the engine and transmission- outlet ducts clear (unattributed)

The Roaring Raindrop was not just a teardrop shape known to give minimum aerodynamic drag at subsonic speeds- in side elevation it also had the cross section of an aerofoil to a wing section of Polish origin which was identified by MG Chief Engineer Syd Enever as ideal for the task. His theory was tested by Harry Herring in the Armstrong Whitworth wind tunnel.

The Morris Engines Experimental Department in Coventry developed an MGA twin-cam, two valve engine which had many trick lightweight competition internals ‘off the shelf’ and a massive Shorrock supercharger driven by a spur gear from the front of an extended crankshaft fed by two whopper 2.5 inch SU carbs. The fuel mix was one third each petrol, benzol and methanol.

The 1957 1489cc engine developed 290 bhp @ 7300 rpm and 516 lb/ft of torque @ 5600 rpm using 32 psi of boost. Cooling of the motor was achieved by the use of two curved radiators from an Avro Shackleton marine reconnaissance aircraft.

(mgaguru)

 

(mgaguru)

EX181 was built under the supervision of Terry Mitchell using a bespoke twin-tube chassis with MGA derived suspension at the front- wishbones, coil springs and lever arm hydraulic shocks and a de Dion rear setup deploying quarter elliptic leaf springs and again lever arm shocks.

Cooling for the single Girling disc brake was provided by a small hinged rear flap on the central spine of the machine aft of the cockpit, this popped  up when the driver pushed the brake pedal and also acted as an air brake.

The final essential element in the cars record breaking specification was Dunlop 24 inch diameter tyres capable of inflation to in excess of 100 psi.

Snug in there, Moss Bonneville 1957

Etcetera…

(S Dalton Collection)

Credits..

Autocar, Theo Page, MotorSport article August 2008, mgaguru.com, Stephen Dalton Collection

Tailpiece: Phil Hill, EX181 Bonneville, 1959…

(unattributed)

Finito…