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What tended to happen with the British Formula Ford championship was that when a new championship was announced the previous era's cars were allowed to compete in a separate class for a season or two to help bolster grids . Therefore in 1993 the Kent engined cars competed alongside the Zetecs , in 2006 and 2007 Zetecs competed alongside Duratecs and in 2012 the Duratecs were allowed in against the Eco Boost cars .
What happened to all the Zetec and Duratec cars ? Most have been converted into Kent specification although some in their original guise compete in the multi class Monoposto championship alongside many other obsolescent single seaters.
In spite of the fact that Zetec and Duratec engines are apparently more economical to run than the older Kent engines British Formula Ford has concentrated on the older engines in recent years . The Avon Tyres National Formula Ford championship has grown out of the North West Formula Ford championship , a popular regional series based at Oulton Park and Anglesey and is probably not aimed at the professional career driver , more the ambitious amateur . Grids have generally been in the twenties or even thirties far exceeding the low teens of the British Formula 4 championship .
After fifty years the Kent engined Formula Ford still allows many enthusiasts to compete in single seater racing either competing in single circuit championships , Castle Combe , Brands Hatch and Knockhill come to mind while series such as the Historic Formula Ford ( pre 1972 ) , Classic Formula Ford ( pre 1982 ) and Heritage Formula Ford ( pre 1993 ) provide an opportunity for enthusiasts to use their older cars
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