Roadster
H/Modified rules stated engine displacement size must be under 850cc. To comply with these rules, Thews made one of his Carrera fours into a Carrera two by removing one pair of opposing pistons and rods. He machined special caps to block the appropriate oil passengers in the crankshaft, blanking off the empty cylinders, removing lobes from two camshafts, and the no-longer-necessary valve train parts. The result was a very effective four-cam twin of just under 800cc. When Thews wanted to race in F Class, the 800cc unit could easily be swapped out and replaced with the 1600cc four-cylinder unit.
By Daniel Vaughan | Nov 2011
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