Diesel Bentley

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Nereus
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Diesel Bentley

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Bentley's first-ever diesel

23 Sep 2016
WRITER: RICHARD LEU

http://www.bangkokpost.com/auto/news/10 ... ver-diesel

Bentayga luxury SUV gets a triple-charged oil-burning V8 engine shared with the Audi SQ7.
First seen in the Audi SQ7, the 4.0-litre V8 diesel-turbo is now available in the Bentley Bentayga SUV. It’s the first time an oil-burner makes its way into a Bentley.

Like in the SQ7, the Bentayga Diesel produces the same 435hp of power and 900Nm of torque achieved between 1,000-3,250rpm.

That’s quite a low engine speed!

Yes, and that’s the highlight of this new diesel. A 48W electrical system generates a supercharger to provide instant oomph from just above engine idling speed. Simply put, it has been designed to eradicate turbo lag.
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This writer often gets it wrong. The facts are as follows:

http://www.carmagazine.co.uk/car-news/f ... esel-2016/

Bentley diesel: two turbos and a compressor

This combination is key to that prodigious torque figure and the impressive acceleration times quoted by Crewe. Adopting 48 volts for its active roll bar technology allows Bentley to apply it to other vehicle functions – in this case a 7kW e-compressor that spins up to 70,000rpm in 250 milliseconds from start. This forces air into both banks of the V8, leading to a prompt response and an increase in its exhaust gas output, which helps spool the first turbocharger quickly.

The clever bit is that the engineering team has utilised the same cylinder deactivation technology employed in the petrol V8 to close off one exhaust valve per cylinder. There are two exhaust valves per cylinder, but each supplies a different turbo. At low speeds the exhaust valve supplying the second turbocharged is closed, increasing the exhaust gas flowing into the first turbo – allowing it to quickly and smoothly take over from the e-booster beyond engine speeds of about 1500rpm.

As engine speed increases the cam slides across, opening the second exhaust valve to feed the ‘passive’ turbocharger, which comes on boost from about 2700rpm to the redline.
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First deliveries of the Bentayga Diesel is set to start in January this year with an estimated Thai price of 22 million baht. ( I guess that is supposed to be next year)
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