Red Bull technical director Pierre Waché has conceded the team face a "steep" learning curve in order to overpower existing engine manufacturers when its Powertrains division competes with its own engine in 2026.
The Milton Keynes-based outfit is currently entered as a PU supplier, albeit with its systems being overseen by Honda in a deal signed through to the end of 2025.
New regulations for engines from 2026 will see a marked change after compromises to help bring in new OEMs, notably with the removal of the MGU-H.
Whilst Audi recently confirmed it is to enter from 2026, a deal between Red Bull and Porsche broke down, leaving the F1 team now going it alone in taking on Mercedes, Ferrari and Renault, as well as Audi.
On the journey facing the team, Waché said: "It is a massive challenge clearly, when you start from scratch, as we are doing.
"We have put everything in place. When you see the building put together and the number of dynos and people there, it is a massive challenge."
Describing why the challenge Red Bull faces is so great, Waché added: "In this area, the learning curve is very steep and the lead time for parts is very long.
"Then we have to try and catch the others with more experience, the current engine suppliers and try to beat them.
"It is a massive challenge and I think we will manage to do it. When I see the desire, the motivation, the quality of the people we have in our team, it looks good."