WATCH: Gordon Murray T.50 V12 rev to 12,100rpm

Gordon Murray Automotive (GMA) has posted a new video that details the development of the T.50's wild naturally-aspirated 3.9-litre V12.

Developed in partnership with former F1 engine builder, Cosworth, the V12 created will produces 485kW and 450Nm, but its main party piece is the incredible ability to rev to 12,400rpm – 1900rpm more than the Aston Martin Valkyrie's Cosworth V12.

This means the T.50, when it arrives in 2022, will have the highest-revving engine of any road car ever produced.

To prove development is well under way, the short vid posted on YouTube by GMA, shows Cosworth testing a scaled-down three-cylinder engine that manages to spin all the way to 12,100rpm.

Aston Martin and Cosworth also took a similar approach of using a quarter-scale model engine before its full-size V12 was produced.

Reducing emissions and boosting power, a lightweight 48-volt mild-hybrid system is also employed and, in the vid, the little three-pot is shown having its emissions checked to ensure it will pass all current legislation.

It's already been announced just 100 examples of the T.50, that uses a pioneering 400mm ground effect fan, that was inspired by the Murray-designed Brabham BT46B F1 car of the 1970s, will be priced from £2.3 million ($A4.6m) when production begins in 2021.

An additional 25 T.50s will also be made for track that's set to feature an even wilder aero package.

Speaking of aerodynamics, GMA has announced that Silverstone-based Racing Point Formula 1 team will lend the car-maker its advanced moving floor wind tunnel and even loan out some of its F1 engineers to help refine the British T.50's air bending.

The aero set-up will be hugely complex as the fan has been calibrated to work differently in six different modes. Two will be automatic, while the final four modes will vary the aerodynamics from super streamlined to a high downforce.

A further setting will maximise drag and downforce for maximum braking.

Cleverly, the 48-volt mild hybrid integrated starter/generator will claw back the energy needed to produce the power required to spin the fan at up to 8000rpm.

Beneath the skin, the airflow is managed carefully using active flaps.

Featuring a three-seat, central driving position, the T.50 is being touted as the true spiritual successor to the original McLaren F1.

Based on a lightweight carbon-fibre monocoque tub, the sub-1000kg rear-drive hypercar will be ultralightweight and come with a traditional six-speed manual transmission, although the 25 track specials are expected to bag a race car's sequential transmission.

Measuring in at around the same footprint as the latest Golf, the T.50 is being readied to only measure in at 30mm wider and 60mm longer than the F1.

Like the F1 the T.50 will feature an air scoop and a ram air affect that near the top speed helps boost total power to more than 520kW.

Next year will also mark the opening of a Gordon Murray Automotive customer experience centre at the Top Gear test track at Dunsfold Park in Surrey in the UK.

Manufacturing is also tipped to begin in the same location shortly afterwards, in 2021, before sales kick off in 2022 — almost 30 years after the original McLaren F1 debuted.

According to GMA most of the 100 T.50 road car allocation are already spoken for, with 40 per cent said to have been sold to buyers under the age of 45.