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Mazda patent shows rotary placement in complex AWD hybrid layout

If we were playing alt-powertrain Bingo, a recent Mazda patent application filed in Japan would be one or two letters from victory. What's exciting about the patent, discovered by Japanese outlet T's Media via Motor Trend, is that while it makes a case for an internal combustion engine of any configuration, one of the drawings showing a rotary engine. The wild bit is that the whole powertrain comprises the ICE, a transaxle, two tiny in-wheel electric motors turning the front wheels, a third electric motor in the driveline, a capacitor, a lithium-ion battery, and three inverters. Motor Trend parsed the mechanics, and the way it reads, Doc Brown couldn't have done a better job. The rotary engine at the front turns the rear wheels, but not directly. Instead of a flywheel on back of the engine, the drawing shows a 25-kW electric motor and an inverter, then a driveshaft running to the transaxle. Along the axis of the transmission tunnel in a normal car, between the inverter and the transaxle, lies a 3.5-kWh battery running at 48 volts. MT writes that the electric motor can add its output to the ICE output to drive the rear wheels, or the e-motor can turn the rear axle on its own. Up front, two inverters and a double-layer capacitor join the ICE in the engine bay. The capacitor and tiny hub motors in the front wheels run at 120 volts, a higher voltage than the rest of the electrical system, so that the small in-wheel motors can generate the same torque as a larger motor running at a lower voltage. The AWD system acts on-demand. Given the signal, the capacitors discharge their energy to the wheel motors, and recover energy from braking. When the capacitors are at full charge, they send excess regen energy to the lithium-ion battery; conversely, the battery can recharge the capacitors when they're low and the front hub motors need power. The patent explains that the ICE works with the rear e-motor to drive the rear wheels at low speeds, the front motors called on to "generate an output only when a large output is required in the high vehicle speed range." The rather complicated system is focused on providing the benefits of a hybrid system and all-wheel drive, but at lower weight than one would expect. A rotary serves due to its compactness, but one of the drawings shows an engine with a V layout. Hub motors get dinged for adding unsprung weight, hence the small motors here.

This is what a 1,200-hp twin-turbo 4-rotor looks like in a Miata

We've seen the diminutive Mazda MX-5 Miata swallow plenty of big engines, but New Zealand drifting ace "Mad Mike" Whiddett is roaring into where-no-man-has-gone-before territory. Wanting to replace his 515-horsepower "MADBUL" RX-7 and its twin-turbocharged, three-rotor 20B engine, his new ride is an NC-series Miata with four rotors and twin Garrett turbochargers courtesy of Pulse Performance Race Engineering. It is called "RADBUL," and expected power at standard boost is 1,200 hp, but the builders at Pulse Performance think it will get up to 1,500 hp at full boost. And yes, that exhaust exits through the hood. Four-rotor engines are actually popular - builds are detailed on forums like this one from 2007 and this one from 2008, this UK company or this Canadian company will sell you one complete - but they're usually being prepped for an RX-7. Mad Mike's choice of a Miata for this enterprise makes this about as extreme as you can get, short of throwing it into a Mazda R360. You can watch Mad Mike tell the story of the build in the video, and check out the first and second installments about the build on the Red Bull site.

Las Vegas reporter makes literal street food

A reporter in the American Southwest did a test to see just how hot it was this week, and received her just deserts. With a promised high of 115 degrees in the Las Vegas Valley on June 20, Caitlin Lilly and Kira Terry of the Las Vegas Review-Journal decided to find out if they could bake cookies and cook breakfast using just the ambient heat of the day and some handy flat surfaces. First, the pair attempted to bake a couple dozen pre-mixed cookies on the dashboard of a Mazda. Starting around 1:00 pm, they left the cookies on a sheet tray propped up beneath the car's un-tinted windows. By 5:00 pm the cookies were done and, according to various R-J staffers, quite delicious. While the cookies were baking, they decided to make themselves something a little more substantial, something to justify the desert they had baking in the Mazda. They found a nice patch of parking lot and tried to fry an egg, some bacon, and a handful of shrimp. The shrimp cooked quickly, as shrimp are wont to do, but after 20 minutes the bacon only browned at the edges while staying raw in the middle. The egg remained uncooked, unfortunately, since even the hottest asphalt isn't hot enough to actually fry an egg. Record high temperatures are baking the American Southwest and Southern California as the region suffers the effects of a weather phenomenon called a " heat dome." Highs of over 100 degrees were reported throughout SoCal, Arizona, and Nevada, which is surprising for mid-June. The threat of wildfires is already astronomical, and people are suffering from heat-related illnesses. Recent Video: