Monthly Features

1954 AJS E95 "Porcupine"

2009 Concours d’Elegance

First in Class Winner


Country: Great Britain
Engine: Air-cooled, 45° parallel twin, four stroke
Ignition: Lucas rotating magnet magneto, chain-driven
Power Rating: Approx. 45 bhp
Bore x Stroke: 68 x 68.5mm
Displacement: 499cc
Valves: Double overhead cams, gear driven
Fuel System: Twin Amal GP carburetors, fed by mechanical fuel pump and header tank
Transmission: Four speed Burman
Suspension: Front Teledraulic forks, rear twin shock
Brakes: Front and rear drum
Weight: 340 lbs.
Top Speed: 125 mph

Introduced in 1952, the E95 was a much-redesigned version of the E90 horizontal twin, which was known as the Porcupine due to the spiky finning on the cylinder head.  The original design was drawn pre-WWII when supercharging was legal.  When racing resumed in the 40s, supercharging was banned and the Porcupine was uncompetitive.  With the redesign, cylinders were given a 45° angle to shorten the wheelbase to improve handling. While fast, the machines were not reliable, and in 1954 were abandoned in favor of the G45 twin, a race version of the G9 street bike.

Check out the feature article on the Museum's E95 at Motorcycleclassics.com.
 

Pebble Beach photos courtesy of Bob Stokstap Photography

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