Honda has released the first image of its F1 power unit which is set to be used by McLaren in 2015.

So far, Honda has been largely secretive about the development of its power unit as it wants to allow McLaren a clean break from Mercedes at the end of the season, However, with the image released on the company's website, Honda motorsport chief Yasuhisa Arai said the unit - which is similar in layout to the Renault version this year - is still under development but confirmed the new Honda base in Milton Keynes was now complete.

"Working toward Honda's F1 participation starting in the 2015 season, development of the power unit is entering its prime phase at our R&D facility in Sakura (Tochigi, Japan), where we transferred our automobile motor sports development earlier this year," Arai said. "In addition to conducting simulations, we have moved onto the next stage where we conduct full-fledged bench tests of the engine while connecting the turbocharger and energy recovery systems.

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"In the meantime, our racing operation base in Milton Keynes, United Kingdom, has become fully operational. At this time, we are unveiling an image of our power unit that is under development. The whole team is concentrating on this development, getting ready for the forthcoming start of F1 participation in 6 months. Please stay tuned for further updates."

Honda will also offer a preview of the engine's sound for fans to hear at its stand at Suzuka during this weekend's Japanese Grand Prix.