Formula 1 supremo Bernie Ecclestone believes the change of regulations to a 2.4-litre V8 engine proved a very costly mistake - but he says the constructors have no one to blame but themselves.
All teams but Toro Rosso will race with a 2.4-litre V8 engine this season following changes in the regulations that were aimed at cutting costs and lowering speeds.
But Ecclestone says the same goals could have been achieved by limiting the revs on the existing V10 engines - in a similar way to what Toro Rosso are doing. And the Briton believes the new rule proved more costly than originally imagined.
"It's a rule I don't like," Ecclestone told Autosprint magazine. "It was not necessary either, because they could have reached the same objectives with the old 10-cylinder engines, by limiting their power.
"The new V8 engines cost a fortune, and the next step will be to limit their revs because they'll become too powerful. So they could have done the same thing immediately, by limiting the V10s. They would have saved plenty of money."
But Ecclestone emphasised the move to V8 was entirely up to the teams.
"There was a meeting in Monaco with all the teams, to discuss cost reductions, and things started going badly, because the prevailing idea was that by limiting the engine capacity by 20 per cent, there would have been a similar reduction in costs and power.
"It was total nonsense; no one analysed the problems in-depth. The constructors pledged to make the V8s, but only later they realised what costs they were about to face."