Mazda has announced a clever new start-stop system that promises fuel economy gains of 10% or more without the need for an electric motor. The Smart Idle Stop System (SISS) uses only direct injection and combustion to restart your vehicle, while most start-stop systems use an electric motor and traditional engine start-up process. SISS stops the pistons in the optimal position for an engine restart, and then injects fuel into the cylinders before the engine begins to rotate and lets the power of combustion turn the engine over to start. This enables an SISS-equipped Mazda petrol engine to restart in 0.35 seconds, or half the time of start-stop systems using an electric motor. The catch: SISS only works with automatic transmissions. Mazda's SISS system will be available in 2009, but the Japanese automaker hasn't yet announced which models will receive the fuel-saving technology, nor has it disclosed whether SISS will be available in the States at launch. With Americans becoming increasingly sensitive to fuel economy and petrol prices, we hope we're not left out in the cold.
The Pontiac G8 Sport Truck was originally supposed to be powered only by General Motors' 361-horsepower 6.0L V8, but tough fuel economy standards and customer demand for fuel efficient products have conspired to change the General's plans. Edmunds Inside Line quotes an anonymous senior engineer at the General saying that the unique sport ute will receive automaker's 3.6L V6, as well. That's good news for fuel economy, but the better news is that the 3.6L V6 of choice will be the direct injection versoin. That will likely give the G8 ST the same 300+hp as the 2010 Camaro and Cadillac CTS. That should also make the base ST more appealing to enthusiasts and the average Joe, with more power at the pedal and a healthier torque curve. The DI version of GM's 3.6L V6 will also likely be available in the base G8 sedan for the 2010 model year, as well. It makes sense that GM would go with direct injection for the G8 ST, as the General has already promised the powerful V6 for the Chevy Traverse and Camaro. Putting DI in more vehicles will help drive down the cost of producing these more high-tech engines economy of scale while also giving customers V8ish performance with V6ish fuel economy. Keep in mind, however, that though a GM engineer was quoted, none of this is official word from GM, so plans could change.
Porsche has already introduced direct injection on the Cayenne and 911 Carrera, and the Turbo, GT2 and GT3 all stand to benefit from the technology next year. While it's normal for most automakers to take the lessons learned from motorsports and apply them to their road cars, Porsche is doing it the other way around.
The 3.4-liter V8 in the Porsche RS Spyder campaigning in the ALMS LMP2 class will be fitted with direct injection, bringing power levels up while reducing fuel consumption. While the old mill put out 476 hp at 10,000 RPM and 273 lb.-ft. of torque beginning at 7,500 RPM, the new engine gets a 27 hp bump, to bring levels up to 503 hp at 10k RPM and 284 lb.-ft. of twist at 8,500 rpm. That, combined with the decreased in fuel consumption should make the Spyder even more competitive in a class it's continuing to dominate.
Porsche's commitment to the KISS philosophy of exterior design won't extend to the engine of the facelifted 911 Turbo, GT2 and GT3 when they're released early next year. All three models will dispatch with the legendary M97 powerplant in favor of the new, direct-injected A91 flat-six that's equipped on the recently updated 911 Carrera.
The two turbocharged 911s will be packing 3.6-liters of displacement, with a 97 mm bore and an 81.5 mm stroke (the outgoing engine was sized 100 mm x 76.4 mm), along with revised turbochargers and intercoolers. Autocar's sources suggest that output on both models will rise by around 20 hp, with the Turbo producing 500 hp and the GT2 pushing out approximately 550 hp. Torque figures should also increase by around four percent.
The GT3 will remain naturally aspirated, with a 3.8-liter version of the A91 with a 102 mm bore and a 77.5 mm stroke. The same internal changes from the Carrera S will carry over to the GT3, including lightweight pistons, valves and springs. Output should increase from around 415 to 430 hp. And all of these changes will also increase fuel efficiency and decrease C02 output. 'Cause that's what really matters... right?
High fuel prices have car buyers looking away from V8 engines in favor of smaller, more efficient powertrains. GM is looking to feed the increased demand with an expansion of its Ramos, Mexico plant that builds its 3.6L V6 engines. The planned increase in output will allow the General to increase production of its next generation V6 engines an additional 350,000 units to a whopping 940,000 engines per year. The next generation HFV6 engines will also provide more of everything customers want, including improved fuel economy and a 6% increase in power. The engines will likely feature direct injection across the lineup this time. There is no word at this time if GM will change the displacement size for the next-gen HFV6 engines, but we did hear a couple weeks back that a Cadillac CTS wagon may feature a smaller 3.0L version of the engine in base form.
The HFV6 production increase was announced at the opening ceremony for Ramos' new six-speed transmission plant, which will also supply slush boxes for FWD crossovers and cars. The transmissions will replace the long in the tooth four-cogs (Yay!) and increase efficiency by up to 7 percent.
The 2009 Porsche 911 has been formally unveiled, sporting lightly -tweaked styling, and important changes under the skin. The 3.6L and 3.8L engines to be found under the engine covers of Carrera and Carrera S models are new, featuring gasoline direct injection for the first time, and bringing more power and improved fuel economy in tow. The 3.6L engine now produces 345 horsepower (a 20-horse increase), while the 3.8 in Carrera S gets a 30-horsepower boost, coming in at a very healthy 385 HP. Both engines' fuel economy and emissions output levels are improved, with the Carrera Coupe boasting a 24 mpg (US) combined-cycle figure.
Also contributing to the cars' improved performance and fuel economy is the new 7-speed dual-clutch transmission that arrives for 2009. Dubbed Porsche-Doppelkupplung (PDK), it replaces the Tiptronic S in the Carrera and Carrera S. Visually, the 2009 Porsche 997 is freshened with bi-Xenon headlamps, LED daytime running lights, and restyled taillamps that now use LED illumination. Also in back, you'll see that the Carreras get ovoid dual exhaust outlets, while the Carrera S cars get a pair of double-barreled tips. The cars arrive in Europe next month with a U.S. launch to follow later in this year.
While we like to chide the Stuttgart crew for "updates" to its 911 range, this newest one actually has some serious substance underneath the tweaked sheet metal. In addition to the revised headlamp and taillight design, CAR is reporting that Porsche will upgrade both the 3.6- and 3.8-liter flat-six boxers with direct-injection. The technology, first employed by Porsche on the 2007 Cayenne, boosted horsepower and torque by around 10- to 15-percent in the SUV, and we hope that similar gains can be made with its iconic six. More impressive, although not entirely unexpected, is the rumored fitment of Porsche's first dual-clutch gearbox. The Doppel Kupplungen transmission will be available on the new 911 after it's unveiled sometime this summer, with sales expected to begin this fall. There's no word on what models will benefit from the DSG 'box initially, nor was there any info about how the new tranny would be implemented on Porsche's all-wheel-drive models.
Land Rovers have run Jaguar's rorty AJ V8 engine since Ford got tired of sourcing engines from BMW. CAR magazine has dug up information on some mules running around in Finland with a new 4997cc engine underhood. Their photographers also caught the vehicles while they hung out in a parking lot full of tantalizing 2 and 7 series Volvos. While the AJ is a great motor, it's well into its design life. Range Rover's new engine is being developed with Bosch, and sports direct fuel injection to boost efficiency while keeping power up and emissions down. Output is rumored at 350 horsepower in naturally aspirated form and 460 ponies come to the party when a supercharger pressurizes the intake. The new engine will wind up in the engine compartment of Land Rovers, Range Rovers, and Jaguars, and will be part of a freshening of Landies and Rangies expected to drop soon.
BMW's twin-turbo 3.0L inline-six has been a rousing success, with nothing less than a Wards 10 Best Engines award sitting in its trophy case. The praise is understandable and well-deserved, as the engine uses a combination of forced induction and direct injection to serve up a torque curve that's far beefier and flatter than what should be expected from a engine of its size. So what next for the propeller brand? Simple -- take similar technology, add it to the company's 4.4L V8 and toss in a dash of unconventional packaging to make everything fit.
BMW put its latest jewel on display at the 2008 Detroit Auto Show, and we snapped some shots of it to give you an idea of why this engine is so special. We've included those photos in one of our galleries, and below the fold, we've thrown in a few observations.
