Formula One manufacturers are sceptical about a proposed new power unit from 2021 because of the 'immense' costs of development, Mercedes executive Toto Wolff said on Wednesday.
Formula One's new US-based owners, Liberty Media, and governing International Automobile Federation (FIA) presented their 'road map' for the future to the 10 teams in Paris on Tuesday.
Currently Mercedes, Ferrari and Renault each supply three teams while Honda will be with Toro Rosso next season.
Formula One manufacturers are sceptical about a proposed new power unit, says Toto Wolff
Formula One have unveiled plans for redesigned, louder engines to come into play by 2021
The powers-that-be are hoping to entice new suppliers after 2020 by making the V6 turbo hybrid power units simpler and cheaper as well as higher-revving, and therefore noisier, to satisfy fans unhappy about the current muted sound.
They also hope to reduce the gulf between the wealthy manufacturer teams like Mercedes and those privately-owned outfits who have to pay for their engines and have far smaller budgets.
'This is their vision and proposal and we haven't accepted it. The flaw of the concept is that it's a completely new engine and new investment,' Wolff told the BBC.
'It portrays it in a way of this is how we're going forward and none of the current OEMs (Original Equipment Manufacturer) was particularly impressed,' added the Austrian.
Red Bull principal Christian Horner is expecting 'a lot of filibustering' over the coming months