A low-emission Nurburgring legend? Porsche have made a 690bhp hydrogen-powered V8 with an 8 minute and 20 second Nurburgring lap-time:
In the case of hydrogen gas, it’s a much steeper hill to climb. For Porsche to get the same power from its simulated V8 when it’s running on hydrogen instead of petrol, it needed turbochargers that perform well beyond the norm. It required boosting kit capable of delivering around twice the amount of air by weight of normal production petrol engine turbochargers.
The answer lay in the type of technology used in Formula 1 and powerful electrically boosted turbochargers. But to find the right combination, the engineers simulated four different layouts using electrically assisted exhaust gas turbochargers and separate e-compressors running on their own and independent of the exhaust system. The first was a parallel system using an e-turbo and e-compressor per cylinder bank.
Although mechanically fairly simple, the route taken by the air is quite convoluted. Inlet air is pressurised by one compressor first, then passes through an intercooler, and then through the second compressor in a two-stage process. It’s neat and effective and Porsche says it managed to get “around” the same power in the virtual world as it did for the petrol version.
Installed in a virtual ‘reference’ vehicle weighing 2650kg, the hydrogen V8 achieved a lap time at the Nürburgring of 8min 20.2sec while returning emissions levels well below Euro 7 levels. Porsche hasn’t been specific about what the reference vehicle is based on but mysteriously neither it nor the 4.4-litre engine appears to be a direct match for any of its production cars.
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