I race Formula Fords 1600, using 1600cc Kent engines. Last year I was using the engine from when I first brought it a few years before and it hadnt been tuned for a while. I race at Castle Combe a fair bit and last year my times were in the 1:14 mins/sec. I got the engine rebuilt and the company doing it said it was down on power by 15%. This year im racing and im 1 second quicker. Silverstone was the same. Whether its a twisty circuit or made up of straights I think its power matters, the faster you can exit corners onto the straight the faster the lap time.
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