Formula 1 sporting director, Ross Brawn, says a compromise has been reached with existing teams to try and attract new ones.
The likes of Porsche, Aston Martin and Cosworth had all expressed varying levels of interest in potentially joining the sport in conjunction with the 2021 rules overhaul.
However, existing teams have not been particularly welcoming after huge investments have been made into developing turbo hybrid engines.
However, Brawn has revealed that existing teams must now share their parts and data in order to help new entrants get up and running as quickly as possible,
“The drawbridge has been pulled up and the existing suppliers don’t want anyone else to come in,” Brawn said via the official Formula 1 website.
“[But] we have found a compromise.
“There are regulations coming out which would mean new entrants will get support from existing entrants.
“There will be components and technology which will have to be shared if it is requested.
“It is not quite such a radical change that we were proposing, but still quite a good step in the right direction and there are some nice changes to the way the driver has to manage the engine, which I think goes a long way in the sporting direction.
“There has been a recognition from the existing manufacturers that they can’t shut the door behind them.
“If we start to get serious interest from another manufacturer or supplier, they have to cooperate to find ways of helping that manufacturer come into F1.”
Brawn also revealed that the timescale in the build-up to the 2021 season has been deliberately manipulated to stop teams with bigger resources getting a head start on their rivals.
“The FIA and ourselves have issued a framework of what the car could be like with tasks for each team to look at aspects of it,” he said.
“It’s not enough for teams to go off and start designing a car, we’re purposefully trying to hold back on that.
“We don’t want teams with a lot of resource to gain a march on those who don’t.
“But it’s a difficult balance because there is a perfectly valid argument that the later you leave the issuing of the information, the more it suits the teams with a lot of resource.
“The teams will have about a year or so to work on the designs of these cars, I think that’s the right sort of timescale. Once they’ve designed their 2020 cars, they need to be able to focus on 2021.”