404kW SUV revealed in US documents
- shares

The Bentley Bentayga looks set to gain a twin-turbo V8 petrol option, after documents detailing the new model were uncovered in the US.

AutoGuide published images of a VIN decoder document submitted by the British marque to the National Highway Traffic Safety Administration, which details two petrol variants of the Bentayga - the existing W12, and a new V8 version.

The new model features a 3996cc (4.0-litre) V8 petrol engine developing 550PS (404kW), and according to the filing will be available for the 2019 model year.

It's alleged the Bentayga V8 should be available in the US from July 2018 onwards, meaning it could be revealed to the public in the coming months.

With that in mind, a debut at the Geneva motor show in March would appear likely, though nothing has been confirmed at this stage.

The 4.0-litre V8's 404kW output matches that of the new Porsche Cayenne Turbo, which claims outputs of 404kW and 770Nm from its twin-turbocharged motor - so the Bentley is likely to feature the same unit.

While it doesn't match the 485kW output of the Lamborghini Urus's version of the same engine, the V8-powered Bentayga should still have some serious go for a two-tonne-plus SUV. Expect a sub-5.0-second 0-100km/h sprint time and a top speed approaching 290km/h.

The petrol V8 will join the existing 320kW/900Nm twin-turbo-diesel V8 and the 447kW/900Nm twin-turbo W12.

Following the V8 petrol, a plug-in hybrid version is expected to join the range in the coming years, likely to draw power from the 500kW/850Nm 4.0-litre twin-turbo V8 hybrid used in the new Porsche Panamera Turbo S E-Hybrid.

We've contacted Bentley's local arm for further comments, so stay tuned to CarAdvice for an update.