At least two of the four engine manufacturers in Formula One are not backing Bernie Ecclestone's push to repeal the new rules for 2013.
The FIA has announced a more environmentally-friendly four-cylinder turbo formula, but F1 chief executive Ecclestone has said he is worried about his sport losing the roar of the current normally-aspired V8s.
"Renault supports the new engine rules because technically it is relevant to our road cars," Renault's F1 engine chief Rob White told Auto Motor und Sport.
He said the rules could also entice other manufacturers to enter or return to F1.
Mercedes' Norbert Haug added: "For us, there is no turning back. The development of the four-cylinder engine has already begun.”
"To go back now would mean a huge waste of money," he said.
For us, there is no turning back
The German media report said Ecclestone's recent stance against the FIA and its president Jean Todt is actually about the 100-year commercial lease agreement between the two sides.
Even though the agreement has been in action for a decade, it has never actually been finally signed off, and the Todt-led FIA is said to be negotiating for better terms with Ecclestone/CVC in a couple of crucial areas.
"There are still some issues that need to be clarified," confirmed Todt. "The agreement is very complex and relates to 100 years, which is so long that none of us will see its end."