Feeds
85%
Nissan Micra DIG-S

Nissan Micra DIG-S

Diesel economy meets petrol refinement

  • alert
  • submit to reddit

New hybrid storage solutions

Miller Cycle time

Another advantage over the Fiat is the total absence of lag from the blower, an inherent advantage of super- over turbo-charging. I suspect nine out of ten drivers when put behind the wheel of a DIG-S would assume it has a 1.5-litre normally aspirated engine and be none the wiser until they got to the fuel pump.

Nissan has accomplished this technical sleight of hand by bolting the supercharger to a very light and low friction three-cylinder engine running on a high compression ratio (13:1) Miller cycle.

Nissan Micra DIG-S

'Nano-polished', no less

By dint of its combustion profile, a Miller cycle engine is good for economy but bad for torque which is why it’s favoured in petrol-electric hybrids where the electric motor can pick up the slack. Attach a mechanical blower to a Miller engine and you get the best of both worlds: economy and torque.

In an effort to maximise refinement and economy, the camshaft has been given what Nissan is calling a "nano-level of polishing", while other moving bits like the valve lifters have been subjected to "diamond-like polishing". Apparently, all this buffing and smoothing has reduced internal friction by up to 50 per cent.

The net result is an engine that makes no more fuss when going about its business than a Swiss watch, not that you actually need to rev it hard to make progress. Peak torque may arrive at a rather high 4400rpm but a good 80 per cent feels like it’s available from around the 1500rpm mark.

Nissan Micra DIG-S

Bit anonymous on the street

If the engine has a downside it’s that its dash and brio can make you forget you are in an econo-box. On a couple of occasions while hustling around the Peak District, the eager engine encouraged me to charge into corners with rather too much vim only to run out of poise and grip at the vital moment.

To further help with economy, the DIG-S packs a start-stop system complete with brake energy harvesting to keep the battery topped up and some subtle aerodynamic tweaks to the chin and rear spoilers that reduce the coefficient of drag from the standard Micra’s 0.33 to 0.29.

Secure remote control for conventional and virtual desktops

More from The Register

next story
Thought that last dinosaur was BIG? This one's bloody ENORMOUS
Weighed several adult elephants, contend boffins
Chelyabinsk-sized SURPRISE asteroid to skim Earth, satnav birds
Space rock appears out of nowhere, buzzes planet on Sunday
City hidden beneath England's Stonehenge had HUMAN ABATTOIR. And a pub
Boozed-up ancients drank beer before tearing corpses apart
'Duck face' selfie in SPAAAACE: Rosetta's snap with bird comet
Probe prepares to make first landing on fast-moving rock
Square Kilometre Array reveals its 1.6TB-a-day storage and network rigs
Boolardy Engineering Test Array - aka BETA - is about to come out of Beta
LOHAN invites ENTIRE REG READERSHIP to New Mexico shindig
Well, those of you who back our Kickstarter tin-rattling...
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
Top 5 reasons to deploy VMware with Tegile
Data demand and the rise of virtualization is challenging IT teams to deliver storage performance, scalability and capacity that can keep up, while maximizing efficiency.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.