Porsche's Intake Manifolds Have An Ingenious Design

More power using less fuel - you've got to love that.

Porsche loves doing things differently. Take the 911, which has adopted a rear-engine setup since its inception. When it comes to intake manifold designs, Porsche also does things differently. Jason Fenske explored this topic in his latest episode of Engineering Explained and the benefits it brings.

In the video, Fenske examines the design of the intake manifold on the Porsche 718 Cayman and 718 Boxster, which recently ditched its naturally-aspirated flat-six in favor of turbocharged flat-four engines. These engines adopt Porsche’s new intake manifold design first introduced in the 2008 911 GT2.

As Fenske explains, most modern engines are designed to generate high-pressure air in front of the engine's intake valves. When the intake valve closes, the air rushing into the engine is forced to build in pressure in the intake port. This pressure wave wants to equalize, so it bounces back and forth in the intake manifold. If the valve openings are timed correctly, that high pressure air forces its way into the engine, making more horsepower and more torque. But Porsche does something radically different.

Instead of increasing the pressure of the air going into the engine, Porsche tries to expand the air. Each intake tract has an expansion chamber where the intake pressure decreases before the intake valves open. It seems counterintuitive until you see how it works. As a result of Porsche’s ingenuity, cylinder temperatures are reduced by 68 degrees F, which leads to a 12 percent reduction in fuel consumption at full load. It's remarkable what can be achieved by simply adjusting the size and shape of tubes.

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Porsche's Intake Manifolds Have An Ingenious Design

More power using less fuel - you've got to love that.

Porsche loves doing things differently. Take the 911, which has adopted a rear-engine setup since its inception. When it comes to intake manifold designs, Porsche also does things differently. Jason Fenske explored this topic in his latest episode of Engineering Explained and the benefits it brings.

In the video, Fenske examines the design of the intake manifold on the Porsche 718 Cayman and 718 Boxster, which recently ditched its naturally-aspirated flat-six in favor of turbocharged flat-four engines. These engines adopt Porsche’s new intake manifold design first introduced in the 2008 911 GT2.

As Fenske explains, most modern engines are designed to generate high-pressure air in front of the engine's intake valves. When the intake valve closes, the air rushing into the engine is forced to build in pressure in the intake port. This pressure wave wants to equalize, so it bounces back and forth in the intake manifold. If the valve openings are timed correctly, that high pressure air forces its way into the engine, making more horsepower and more torque. But Porsche does something radically different.

Instead of increasing the pressure of the air going into the engine, Porsche tries to expand the air. Each intake tract has an expansion chamber where the intake pressure decreases before the intake valves open. It seems counterintuitive until you see how it works. As a result of Porsche’s ingenuity, cylinder temperatures are reduced by 68 degrees F, which leads to a 12 percent reduction in fuel consumption at full load. It's remarkable what can be achieved by simply adjusting the size and shape of tubes.

View the original article here

Acura TL SH-AWD New Design

The 2010 Acura TL was revealed with some new features that were controversial to say the least. The biggest shock was the new shield grille that is not so pleasing to the eye. Grille aside, the TL has had the cleanest design of any Acura to date. Proportions seem good all around the TL except for where the design falls flat in its ratio of wheelbase to overall length. Suffice to say that a small addition of four inches would have provided the TL with better overall balance.

Where the TL lacks on the outside it makes up with an exceptional interior. Comfort is the key word for the TL's dual cockpit and the driver's seat, wheel and information display, are what we have come to expect from Acura.

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2019 Acura RDX Design And Details Teased Before New York Reveal

All-new RDX gets 2.0-liter VTEC turbocharged engine and A-Spec variant.

Acura isn’t wasting time with the all-new 2019 RDX. After revealing the RDX Prototype at the North American International Auto Show in Detroit, Honda’s luxury brand will bring an example wearing production sheet metal to the New York Auto Show later this March. The 2019 Acura RDX goes back to its roots, powered by a new 2.0-liter VTEC turbocharged four-cylinder engine sending power to the pavement via the brand’s Super-Handling All-Wheel-Drive system.

Acura didn’t detail specifics for the 2.0-liter turbo engine, but expect output to be similar to that of the Honda Accord—252 horsepower at 6,500 rpm and 273 lb-ft of torque between 1,500 and 4,000 rpm. The RDX’s 10-speed automatic—a segment first—will likely offer the same paddle shifters as the Accord, too. Acura claims the 2019 RDX is the “most extensive Acura redesign in more than a decade,” which it says will set the tone for “a new era” for the brand. Its exterior will likely wear near identical sheet metal to that of the RDX Prototype, and probably the same interior, too. Acura calls it “Precision Cockpit” and it includes the brand’s True Touchpad Interface.

Like other Acuras of late, the RDX is expected to gain an A-Spec variant toward the top of its trim range. While Acura didn't specify how the A-Spec model will differ from other RDXs, don't expect more power or performance as the brand has generally limited A-Spec modifications to visual enhancements. Instead, any additional performance would likely arrive in the form of a new S-Type trim, which could bring with it a newly developed V6 engine. The 2019 Acura RDX is an all-American affair, designed by the folks at Acura Design Studio in Los Angeles, California, and developed by engineers in Raymond, Ohio. The third-generation SUV will go on sale later this year.

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The Exterior Design Emphasizes A Bold

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