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No after-treatment with new Sonia Euro-5 13-litre six-pot
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Looking to buy a Euro-5 truck but don't want SCR? Scania may have just what you are looking for. Brian Weatherley reports from Sweden.
SCANINS CLAIM 10 be "the first heavy vehicle manufacturer to offer a Euro-5 engine without exhaust after-treatment" will clearly not go unnoticed by all those British truck buyers who remain wary of SCR (selective catalytic reduction), but who want to go to Euro-5 with their next truck.
And the power unit that will spearhead the Swedish truck maker's attack on Euro-5 will be its all-new 12.7-litre in-line six, available from 360-480hp. As well as EGR (exhaust gas recirculation), it features XPI, the latest result of Scania's high-pressure-fuel-injection partnership with US engine manufacturer Cummins.
Maximum torque on the most powerful 480hp rating is an impressive 2,500Nrn — the same as Scania's 500hp V8.
The latest `13-litre' six pot is joined by a new 9.3-litre five cylinder Euro-5 EGR engine rated at 230-320hp. The two engines share a number of features from what the truck maker describes as its "common engine platform" including Scania's trademark separate cylinder heads, a high-mounted camshaft and stronger blocks — but without going to carbon graphite iron construction.
The 13-litre engine's new XPI (short for "extra high-pressure") common-rail fuel system, with electronic unit injectors, can operate at up to 2,400bar. Meanwhile. Scania's latest electronic fuel-management unit ensures far greater control of injection timing and metering independently of the camshaft and engine speed. The system allows multiple injections throughout the combustion cycle with pilot, main and postinjection phases, the last of which helps to further reduce soot and NOx by ensuring prolonged swirl in the combustion chamber.
The new in-line six sports a Cummins/Holset variablegeometry turbocharger (VGT) with a sliding annular ring (similar to the system used by Iveco on its Cursor engines). The VGT increases turbo boost pressure at low revs.ensuring quicker throttle response as well as helping to speed up changes through the Opticruise auto box.
To ensure maximum efficiency within the EGR process, Scania has developed a patented twostage water-and-air cooling system which lowers the temperature of the exhaust gases being fed back into the engine from the previous 150C to 50C. This further reduces the formation of NOx.
The current Euro-4 8.9 and 11.7-litre engines will continue to be sold alongside the new 9.3 and 13-litre power units which, for now, will only be offered at Euro-5.
Among the many claims made for the new 13-litre is that it will deliver Euro-3 fuel economy with Euro-5 emissions...not a bad trick if it can be achieved on the road. But above all else it needs no exhaust after-treatment to reach the Euro-5 emission standard which comes into effect in 2008/9. The other good news is that it's up to 90kg lighter than the previous 11.7-litre engine.
FOR MORE ON THIS AND RELATED SUBJECTS
www.roadtransoorLcom/cm