Audi’s new mo­tor: 2 lt power, 1 lt fuel use


IN the face of ever-tight­en­ing emis­sions reg­u­la­tions, the world’s car man­u­fac­tur­ers are find­ing in­no­va­tive ways to cut fuel con­sump­tion. In its quest for greater fuel ef­fi­ciency, Audi has de­vel­oped a four-cylin­der TFSI en­gine that makes use of a new com­bus­tion method, re­sult­ing in what Audi claims is the most ef­fi­cient two-litre gaso­line en­gine in its class.

The com­bus­tion method used in Audi’s new en­gine is sim­i­lar to the Miller cy­cle, and al­lows the 2,0 litre turbo unit to pro­duce 140 kW, all the while re­turn­ing a se­ri­ously im­pres­sive 5,0 L/100 km on the New Euro­pean Drive Cy­cle (NEDC). The en­gine also pro­duces 320 Nm of torque, all of which will be avail­able from just 1 450 rpm, mak­ing it per­fect for surg­ing into gaps in the traf­fic from low speeds.

To achieve th­ese fig­ures, Audi has short­ened the en­gine’s in­take time by tak­ing the crank an­gle and re­duc­ing it from 200 to 140 de­grees. De­spite the shorter in­take time, the en­gine can still achieve op­ti­mal cylin­der charges thanks to higher boost pres­sure on its in­let side. Un­der the en­gine’s new com­bus­tion cy­cle, the in­take valve also closes ear­lier than it usu­ally would, which al­lows Audi to run an ef­fi­ciency boost­ing high com­pres­sion ra­tio.

“Thanks to this right­siz­ing ap­proach, the new en­gine en­joys the con­sump­tion benefits of a down­siz­ing en­gine in par­tial load op­er­a­tion, while at higher loads it has the ad­van­tages of a large-dis­place­ment en­gine,” says Ste­fan Knirsch, Audi’s head of en­gine devel­op­ment. “The re­sult is op­ti­mal ef­fi­ciency and per­for­mance char­ac­ter­is­tics across the en­tire en­gine speed range.” The new en­gine, which is set to de­but in the next-gen­er­a­tion A4, has also been de­signed to spend less time in its warm-up phase, and Audi has fo­cused on re­duc­ing fric­tion — some­thing Mercedes does with its Nanoslide coat­ing on the in­side of its en­gines.

On top of th­ese ef­fi­ciency-driven changes to the drive cy­cle, the new en­gine is also light, weigh­ing in at just 140 kg, which should aid the new A4’s han­dling bal­ance as well as its fuel con­sump­tion sticker.

The en­gine was un­veiled at the Vi­enna Mo­tor Sym­po­sium. — Giz­

The fru­gal mill for the next A4.

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