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Tech: Engine Variable Compression Gamechanger

| Green | 11.12.2017

At the Los Angeles Auto Show, Nissan introduced a break-through engine technology that can improve the efficiency and power of current engines—variable compression.

The post Tech: Engine Variable Compression Gamechanger appeared first on Clean Fleet Report.

www.cleanfleetreport.com

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2018 Nissan 370Z Roadster Review

| Auto News | 11.12.2017

Nissan doesn’t even know if it’s going to make another one, but does that mean that we should ignore the latest Nissan Z? It’s no secret that many car buyers have moved on from fun sports cars to more practical SUVs. Just look at every automaker’s lineups, they are filled with SUVs, while the enthusiast […]

The post 2018 Nissan 370Z Roadster Review appeared first on The Torque Report.

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2018 Jeep Grand Cherokee Trackhawk – 707 hp Engine Sound

| Video | 11.12.2017

2018 Jeep Grand Cherokee Trackhawk – Drive, Interior and Exterior.

- Quickest SUV ever: 0-60 miles per hour (mph) in 3.5 seconds, quarter mile in 11.6 seconds and top speed of 180 mph
- Upgraded TorqueFlite eight-speed automatic transmission and driveline components engineered to handle additional torque output
- 60-0 mph braking performance of 114 feet
- New Brembo braking system includes largest-ever front brakes on a Jeep® vehicle
- World-class on-road driving dynamics: Upgraded TorqueFlite eight-speed automatic transmission and driveline components, five drive-mode Selec-Track system and Bilstein adaptive damping suspension
- Aggressive, functional exterior appointments include unique quad-tip exhaust and redesigned fascia that optimizes airflow and cooling
- New standard 20 x 10-inch Titanium-finish wheels expose distinctive yellow Brembo brake calipers
- Driver-focused interior: 7-inch instrument cluster with centered tachometer and 200-mph speedometer; 8.4-inch touchscreen with Trackhawk Performance Pages
- More than 70 safety and security features

Powering the 2018 Jeep Grand Cherokee Trackhawk is a supercharged 6.2-liter V-8 engine delivering 707 horsepower and 645 lb.-ft. of torque.

The breakthrough supercharged engine is designed and manufactured using only the strongest and most durable materials. Its cast iron block features water jackets between the cylinders for optimal cooling. A forged-steel crankshaft with induction-hardened bearing surfaces is so strong it can withstand firing pressures of nearly 1,600 psi (110 bar) – the equivalent of five family sedans standing on each piston, every two revolutions. The unique, specially tuned crankshaft damper has been burst tested to 13,000 rpm.

High-strength, forged-alloy pistons – developed using advanced telemetry measurement – are coupled to powder-forged connecting rods with high-load-capacity bushings and diamond-like, carbon-coated piston pins.

Premium grade, heat-treated aluminum-alloy cylinder heads are optimized for superior thermal conductivity. Sodium-cooled exhaust valves feature hollow-stem construction and special steel-alloy heads that stand up to temperatures as high as 1,652 degrees Fahrenheit (900 degrees Celsius).

The 2,380cc per revolution supercharger includes integral charge-air coolers and an integrated electronic bypass valve to regulate boost pressure to a maximum of 11.6 psi (80 kPa). The twin-screw rotors are specially coated with:

- a proprietary formula of polyimide and other resins
- nanometer-sized, wear-resistant particles
- solid lubricants, such as PTFE (Teflon)

The coating enables tighter clearance between the rotors. This reduces internal air leakage, delivering improved compressor performance and higher efficiencies. The coating can withstand the temperatures generated by compression, and provides superior corrosion resistance.

The supercharger is sealed for life with premium synthetic oil, uses a drive ratio of 2.36:1 and has a maximum speed of 14,600 rpm. The supercharger drive system’s one-way clutch de-coupler improves refinement, while allowing for precisely the kind of powerful sound certain to captivate Jeep Grand Cherokee Trackhawk drivers.

Air sources for the supercharger include a cold-air scoop in the lower front fascia, which replaces the driver’s-side fog lamp and helps to feed the 92mm throttle body.

The large-nosed crankshaft drives a high-flow gerotor oil pump, which feeds a lubrication circuit that includes eight high-flow piston-cooling jets. A high-capacity oil/air heat exchanger, mounted in the front of the Trackhawk, mitigates oil temperatures when driving conditions are harshest, such as on the track.

A new low-temperature cooling system, consisting of a pump, reservoir, heat exchanger and lines, help keep the charge air cool during performance driving. This system is designed to keep intake air temperatures below 140 degrees Fahrenheit (60 degrees Celsius), under extreme ambient conditions, while enabling air flow of up to 30,000 liters per minute.

A new fuel delivery system, featuring two high-flow, multi-mode pumps, matches the high-performance demands of the engine.

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Sunday Drive: A new Rambo Lambo takes center stage

| Auto News Recaps | 10.12.2017

Filed under: BMW,Lamborghini,Mercedes-Benz,Porsche,Convertible,Coupe,Crossover,Sedan,SUV,Luxury,Performance,Specialty,Auto News Recaps

So, you say you like horsepower?

Continue reading Sunday Drive: A new Rambo Lambo takes center stage

Sunday Drive: A new Rambo Lambo takes center stage originally appeared on Autoblog on Sun, 10 Dec 2017 13:00:00 EST. Please see our terms for use of feeds.

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Church of MO: Top 600s, 1997 Sportbike Shootout

| Moto News | 10.12.2017


Church of MO: Top 600s, 1997 Sportbike Shootout
Twenty years ago, it was all about the 600s more www.motorcycle.com

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