Feeds
85%
Nissan Micra DIG-S

Nissan Micra DIG-S

Diesel economy meets petrol refinement

  • alert
  • submit to reddit

Build a business case: developing custom apps

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.

Securing Web Applications Made Simple and Scalable

More from The Register

next story
Asteroid's DINO KILLING SPREE just bad luck – boffins
Sauricide WASN'T inevitable, reckon scientists
BEST BATTERY EVER: All lithium, all the time, plus a dash of carbon nano-stuff
We have found the Holy Grail (of batteries) - boffins
The Sun took a day off last week and made NO sunspots
Someone needs to get that lazy star cooking again before things get cold around here
Boffins discuss AI space program at hush-hush IARPA confab
IBM, MIT, plenty of others invited to fill Uncle Sam's spy toolchest, but where's Google?
Famous 'Dish' radio telescope to be emptied in budget crisis: CSIRO
Radio astronomy suffering to protect Square Kilometre Array
Bad back? Show some spine and stop popping paracetamol
Study finds common pain-killer doesn't reduce pain or shorten recovery
Forty-five years ago: FOOTPRINTS FOUND ON MOON
NASA won't be back any time soon, sadly
prev story

Whitepapers

Designing a Defense for Mobile Applications
Learn about the various considerations for defending mobile applications - from the application architecture itself to the myriad testing technologies.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Seven Steps to Software Security
Seven practical steps you can begin to take today to secure your applications and prevent the damages a successful cyber-attack can cause.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.