Toyota and Yamaha developing hydrogen-fuelled 449bhp V8
New hydrogen-burning V8 is based on that used by the Lexus RC F...
Reworking of the RC F's naturally aspirated 5.0-litre engine shows how hydrogen could preserve combustion
Yamaha is developing a hydrogen-fuelled 5.0-litre V8 engine for Toyota, as part of the two firms' ongoing commitment to internal combustion.
Toyota and Yamaha – along with Mazda, Kawasaki and Subaru – have previously pledged to continue investing in combustion technology. The five Japanese manufacturers appeared in a joint press conference late last year to express their interest in "expanding fuel options", while other global manufacturers embrace all-out electrification.
The new hydrogen V8 has been detailed following Toyota's deployment of a hydrogen-combustion Corolla in Japan's Super Taikyu race series, and the subsequent reveal of an identically powered GR Yaris prototype.
The new engine is based on that used by the Lexus RC F sports coupé, with modifications to the injectors, heads, intake manifold and elsewhere. Yamaha claims it delivers 449bhp at 6800rpm and 398lb ft at 3600rpm - near-identical figures to those of the hardcore RC F Track Edition.
As with Toyota's previous hydrogen-combustion creations, there remains no indication that the modified unit could find its way into a production car, but Yamaha president Yoshihiro Hidaka has been vocal about his belief in the technology's potential.
“Hydrogen engines house the potential to be carbon-neutral while keeping our passion for the internal combustion engine alive at the same time," he said.
“Teaming up with companies with different corporate cultures and areas of expertise as well as growing the number of partners we have is how we want to lead the way into the future.”
Yamaha says it began developing a hydrogen car engine "about five years ago", and is also working with Kawasaki on a potential use for such an engine in the motorcycle sector.
Takeshi Yamada, who works in Yamaha's dedicated hydrogen engine development team, said hydrogen engines have "very fun, easy-to-use performance characteristics".
He added: "Hydrogen engines have an innately friendly feel that makes them easy to use even without resorting to electronic driving aids. Everyone who came to test-drive the prototype car would start off somewhat skeptical, but emerged from the car with a big smile on their face at the end."
One particular characteristic Yamaha highlights is the V8's raucous engine note, which can be preserved by adapting it to burn another type of fuel. Toyota said the same thing of the hydrogen-fuelled GR Yaris 'H2' prototype it showed last year, reinforcing the potential for the technology to serve the sports car segment in particular.
Toyota's European boss Matt Harrison said at the time that burning hydrogen would allow the firm to "deliver almost zero tailpipe emissions without electrification, but it does so whilst retaining the things which fans love most about race cars – the speed and the noise."
It is not the first time the two firms have collaborated on a highly strung sports car engine. The Lexus LFA hypercar's 552bhp 4.8-litre V10 was a shared effort, and entirely bespoke to that car.
Yamaha also designed the cylinder heads, inlet valves, camshafts and intake for the 2UR-GSE V8 used by the Lexus IS F, Lexus RC F, Lexus GS F and the Toyota Hilux Dakar racer.