In the incoming step towards its bold content of becoming the fuel-economy cheater (Hyundai/Kia is currently ordinal coverall behindhand Toyota and Honda), Hyundai unveiled the direct-injection edition of its 2.4-liter four-cylinder engine, which is slated to motion under the hood of the swoopy 2011 Sonata mid-size sedan. Dubbed Theta II GDI and developed over nearly quaternary eld at a cost of $147 million, the Korean company’s first DI engine is beatific for 198 or 200 hp at 6300 rate and 184 or 186 lb-ft of force at 4250 rate (depending on whether it is exhaling finished a threefold wear or not). Those drawing equal bumps of 23â€"25 hp and 16â€"18 lb-ft over the most coercive edition of the port-injected 2.4 in the underway U.S.-market Sonata. Fuel frugalness gains are claimed to be in the 5-to-10-percent neighborhood, to an estimated best-in-class 23 mpg municipality and 35 mpg route rating; the underway Sonata is rated for 22 mpg municipality and 32 mpg route with an automatic transmission. Manual versions convey 21/32.
The production figures top those of the four-bangers now banging under the hoods of the Sonata’s combative set, hour of which currently apply candid injection. The Toyota Camry’s 2.5-liter puts discover 179 hp and 171 lb-ft in top spec, the Ford Fusion’s 2.5-liter Duratec is beatific for 175 hp and 172 lb-ft, and the 2.4-liter EcoTec in the Chevrolet Malibu is rated for 169 hp and 158 lb-ft. The burliest quaternary in the Accord makes 190 hp, but its 162 lb-ft of twist falls much shorter. The 175-hp 2.5-liter in the Nissan Altima comes closest in the latter category, with 180 lb-ft.
The new engine also adds a two-stage uncertain intake as well as uncertain regulator timing for both intake and exhaust; the preceding non-DI edition featured uncertain timing exclusive on the intake side. Injecting render direct into the cylinders at as broad as 2200 psi also allows the new engine’s densification to be upraised from 10.5:1 to a impressive 11.3:1, but it module ease separate (and make its flooded horsepower rating, we’re told) on regular fuel. Hyundai says the block is stiffer than before and that a total of more than 10 pounds of coefficient was ransomed finished various tweaks much as redesigning the crankshaft and the ingest of a device catalytic converter. The company goes on to say that the engine meets California’s ULEV-2 and PZEV standards and that it plans to modify its ingest to another vehicles in the near future.
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