How Dynamic Skip Fire Works – Variable Displacement Engines

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Dynamic Skip Fire is a new Tula/Delphi technology that aims to be the ultimate form of cylinder deactivation. It allows for fully variable cylinder deactivation, meaning if you have a V8 engine, it can run on one cylinder, two cylinders, or any number of cylinders up to all eight cylinders.

This video will explain how the cylinder deactivation works, what the advantages are, pumping losses, and what real world efficiency benefits can be expected. The majority of the benefit of this system comes from reducing pumping losses. That is to say, it’s more efficient to run one cylinder at high load for a certain amount of power, versus running four cylinders at low load for that same amount of power.… READ THE REST

Electric Superchargers – How Audi Is Eliminating Turbo Lag

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The Audi SQ7 is powered by a 4.0L sequential turbo diesel V8. It’s good for about 435 horsepower and 660 lb-ft of torque, which is great, but the fun doesn’t stop there. In order to eliminate unresponsive nature of turbocharged engines, Audi has fitted the car with an electric supercharger, the first in a production vehicle.

This means adding an onboard 48V system that can handle the additional power requirements of the electric powered compressor (EPC), which at full throttle can produce 7 kW of power, enough to spin the compressor wheel up to 70,000 RPM in just a quarter of a second. Full details of how this system works in the video, as well as animations.

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Volkswagen’s V5 Engine — When A VR6 Is Too Big

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V5 engines are a rare anomaly in the automotive world. Honda used a 1.0L V5 engine in motorcycles, with great success, though the setup hasn’t been seen in many production cars. VW produced a V5, or more accurately a VR5, for its packaging and power benefits versus a larger VR6, or a smaller inline four cylinder.

The VR5 engine style, though only requiring two camshafts (SOHC, 2 valves per cylinder, or DOHC, 4 valves per cylinder), has its complications. The intake and exhaust paths are shorter for two of the cylinders, the crankshaft geometry is offset from the cylinder center lines, and ultimately it’s not much more powerful than an inline four cylinder. Check out the video for full details about how the engine works.… READ THE REST

Flatplane vs Crossplane V8 Engines – Which Is Best?

Flatplane vs Crossplane V8 engines. Foreign vs. domestic. What is a flatplane crankshaft? What is a crossplane crankshaft? These engines get their names from the design of the crankshaft, and have key distinct differences. Flatplane engines have the primary forces balanced out, so the crankshaft can be light and fast revving. Crossplane V8 engines have the secondary forces balanced out, making them very smooth with the addition of counterweights to balance out the primary forces.

Related Videos: V8 Engine – http://youtu.be/1H-GWcwO4vw Engine Balance – http://youtu.be/aonbwOxooGA Primary Balance – http://youtu.be/9Bdc9CuBOzc Secondary Balance – http://youtu.be/gdHQ8aTfiQQ

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5 Reasons Diesel Engines Make More Torque Than Gasoline

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If you compare gasoline and diesel models of the same vehicle, the diesel engine tends to have far more torque. Why is this? In this video we’ll discuss the major differences between diesel and gasoline engines, that result in the diesel engine producing significantly more torque.

From the compression ratio, the speed of combustion, the bore vs stroke ratio, the use of turbocharging, and the energy density of diesel, there are many logical reasons why it’s chosen for high torque applications.

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How Fast Could A Tesla Roadster Hit 60 MPH On Mars?

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SpaceX sent a Tesla Roadster out into space on the Falcon Heavy, and it did not land on Mars. Which begs the question, if a new Tesla Roadster was on Mars, how long would it take the Roadster to accelerate to 60 MPH?

Okay, so maybe it doesn’t beg the question, but you’re probably at least mildly curious to find out at this point. We’ll need to determine the frictional coefficient of the Tesla Roadster’s tires (and assume we’ll be driving on pavement on Mars, or something with similar grip to asphalt), and then apply this to a vehicle accelerating on a planet with a fraction of the gravity of planet Earth. What’s the result? Check out the video to find out!… READ THE REST

How The Acura NSX Connects Man To Machine

How Engineers Connected Man And Machine In the Acura NSX Engineering A Feeling Brought To You By Acura – https://www.acura.com Subscribe for new videos every Wednesday! – https://goo.gl/VZstk7

Acura believes the best way to engineer a feeling, to become one with the car, is the idea of zero-delay. Basically any inputs from the driver must result in immediate outputs from the car. For example, all of the interfaces that you as a driver touch, must react seamlessly. The throttle, the brakes, the steering, and the shifting. If there’s a delay between when you act, and when the car reacts, you feel disconnected from the driving experience, and it’s that delay that Acura sought to eliminate.

Typically with turbocharged engines, there’s a response delay in the throttle as a result of turbo lag. In the NSX, this delay is eliminated by using the immediate torque of the three electric motors. All three motors provide peak torque up to 2,000 RPM, and by 2,000 RPM the engine is ready to provide peak torque all the way to 6,000 RPM.… READ THE REST