Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

Concept Car of the Week: Mazda RX500 (1970)

Developed by the Toyo Kogyo Company's advanced design and engineering team, the Mazda RX-500 was described as a ‘mobile test bed for high-speed safety'. Looking at its design, the team's childlike enthusiasm has shone through, resulting in a very cool concept.  From the rakish front to the wraparound windscreen and on to the bread van rear, everything communicates high-tech and ‘70's futurism while also channeling a little of the Star Wars X-Wing. Thanks to plastic body panels, the concept weighs only 850kg and is powered by a 491cc rotary engine delivering 247bhp fitted behind the cabin, in front of the rear axle.

2014 Hyundai Elantra, Tucson FCEV and a new Nu engine at the LA Auto Show

Hyundai made a boatload of news at the Los Angeles Auto Show on Wednesday. The Korean company unveiled the redesigned 2014 Elantra coupe, sedan and GT, the Veloster R-Spec hatchback and some interesting info on its upcoming fuel-cell program. The biggest news is Hyundai's revamped 2.0-liter Nu engine that now makes 173 hp, instead of 145 hp, and 154 lb-ft of torque, as opposed to the 130 of the old engine.

Infiniti Emerg-E concept

Infiniti's third recent concept car, the Emerg-E, will debut at the Geneva motor show next week. Following the Essence of 2009 and last year's Etherea, the Emerg-E is the brand's first mid-engined car design. While the proportions of all three cars are very different (thanks to the Essence's front-engine, rear-wheel drive layout and the front-engined, front-wheel drive Etherea), their form language is shared.