Feeds
85%
Nissan Micra DIG-S

Nissan Micra DIG-S

Diesel economy meets petrol refinement

  • alert
  • submit to reddit

Security for virtualized datacentres

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.

Internet Security Threat Report 2014

More from The Register

next story
SECRET U.S. 'SPACE WARPLANE' set to return from SPY MISSION
Robot minishuttle X-37B returns after almost 2 years in orbit
LOHAN crash lands on CNN
Overflies Die Welt en route to lively US news vid
America's super-secret X-37B plane returns to Earth after nearly TWO YEARS aloft
674 days in space for US Air Force's mystery orbital vehicle
'Utter killjoy Reg hacks have NEVER BEEN LAID', writes a fan
'Shuddit, smarty pants!' Some readers reacted badly to our last Doctor Who review ...
Experts brand LOHAN's squeaky-clean box
Phytosanitary treatment renders Vulture 2 crate fit for export
Carry On Cosmonaut: Willful Child is a poor taste Star Trek parody
Cringeworthy, crude and crass jokes abound in Steven Erikson’s sci-fi debut
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Win a year’s supply of chocolate
There is no techie angle to this competition so we're not going to pretend there is, but everyone loves chocolate so who cares.
Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Saudi Petroleum chooses Tegile storage solution
A storage solution that addresses company growth and performance for business-critical applications of caseware archive and search along with other key operational systems.