May 22 (GMM) The saga about F1's future engine regulations has taken a twist, with the possibility that both four-cylinder and V8s could be pitted against one another in 2013.

We reported earlier on Sunday that, after a meeting with the manufacturers in Barcelona, Jean Todt had vowed to push ahead with the scheduled new regulations.

But F1 chief executive Bernie Ecclestone, who is staunchly opposed to scrapping the V8s, said FIA president Todt is now proposing to let some V8s continue to fire in 2013.

"But I mean, equivalency formulas never work, do they?" he is quoted by Reuters.

The situation reminds of 2006, when after the current V8 engines were introduced, Toro Rosso ran a performance-limited V10.

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