Porsche is leaving no stone unturned because it seems forward to an period of cleaner mobility. Already engaged on EVs and e-fuels, the model mentioned right now that its engineering division has additionally checked out changing one in all its V8 engines to hydrogen.
The corporate has “developed a hydrogen combustion engine that goals to match the facility and torque of present high-performance gasoline engines as an idea examine,” mentioned Vincenzo Bevilacqua, a senior skilled in engine simulation at Porsche Engineering. “On the similar time, we additionally had the target of attaining low gasoline consumption and protecting emissions on the similar stage as ambient air.”
Though it was only a digital examine, not a bodily one, the staff began with Porsche’s 4.4-liter V8 engine and modified it to run on hydrogen. The largest problem was adapting the turbochargers to work with the brand new gasoline.
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“For clear combustion of hydrogen, the turbochargers need to, on the one hand, present round twice as a lot air mass as they do in gasoline engines,” mentioned Bevilacqua. “Then again, nevertheless, the decrease exhaust gasoline temperatures lead to an absence of power for his or her propulsion on the exhaust aspect.”
The staff, subsequently, needed to flip to electrical compressors to generate the strain it wanted and, after a number of exams, ultimately landed on a system with back-to-back turbos. Utilizing a typical shaft pushed by the turbine or the electrical motor, the air flows by the primary compressor, is cooled in an intercooler, after which recompressed within the second stage.
The outcome, is an engine that, in simulations, can ship round 590 hp (440 kW/598 PS). The Porsche Cayenne Turbo S E-Hybrid‘s 4.0-liter V8, for comparability, pumps out 541 hp (403 kW/548 PS). Mixed with the electrical motors, nevertheless, the system can generate 670 hp (500 kW/680 PS).
To determine how that efficiency would translate right into a car, the staff used the “digital twin,” a simulated car, with the engine in it to estimate how rapidly it may get across the Nürburgring. Positioned in a “luxury-segment reference car with a comparatively excessive whole weight of two,650 kg” (5,842 lbs), which is about 220 lbs (100 kg) greater than the hybrid Cayenne, the car was able to getting across the famed observe in 8:20. For reference, that’s precisely the identical time as a 2008 Chevrolet Camaro SS.
With no CO2 emissions to talk of, Porsche says that the exhaust gasses leaving the hydrogen engine are as clear because the ambient air, albeit with some nitrogen oxide in it, which the Volkswagen Group has struggled with earlier than. It says, nevertheless, that it has been able to getting the concentrations of that gasoline all the way down to Euro 7 rules with ease.
Though Porsche claims that the price of producing a hydrogen engine can be similar to that of manufacturing gasoline engines, this idea engine is unlikely to make it to that stage. That doesn’t imply we’ll by no means see a hydrogen-powered Porsche, although.
“The examine allowed us to achieve precious insights with regard to the event of high-performance hydrogen engines and add fashions and strategies particularly for hydrogen to our digital simulation methodology,” explains Bevilacqua. “With this know-how, we’re able to effectively deal with future buyer tasks.”