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In photos: A car's journey from trash heap to brand-new engine

Popular Science logo Popular Science 6/11/2018 Rob Verger. Photography by Stephen Mallon.

Watch junkyard cars get new life as engine blocks.

recycled aluminum piston© Stephen Mallon recycled aluminum piston

Like people, cars die. But they won’t be buried. U.S. scrappers recycle some 13 million autos each year. Their journey begins at salvage yards, where massive machinery reduces mountains of rundown bodies to reusable metal bits. The vehicular refuse then heads to foundries to start its new life as engines. This is what that trip looks like.

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a pile of dirt: Junked cars piled high© Stephen Mallon Junked cars piled high

A scrapyard in Grand Rapids, Michigan.

Junked cars pile as high as five stories at the 20-acre Padnos scrapyard in Grand Rapids, Michigan. They don’t sit there long: The heap’s contents can turn over daily. Two cranes—each capable of hoisting up to 55,000 pounds—move car husks by the claw-full onto a conveyor belt, destined for annihilation.


conveyer belt pulverizer© Stephen Mallon conveyer belt pulverizer

A car shredder.

A banged-up car slips off the end of an 8-foot-wide conveyor belt toward the shredder (hidden below dust at right). But this is no Staples-style paper slicer: It’s a mill of 14 hammers, each weighing 400 to 500 pounds and spinning at 500 rpm. The mallets quickly pulp engines, frames, and panels into metallic mulch.


kodiak refuse sorter© Stephen Mallon kodiak refuse sorter

Parts sorting at the Eddy Current Plant.

Semis haul the metal 11 miles to the Eddy Current Plant, where 400 feet of belts and machines sort the refuse. This one, called a Kodiak, removes chunks of stainless steel. Like airport detectors, sensors spot disruptions the metal causes in an electromagnetic field. Mechanical flippers then flick it out of the flow.


a close up of a rock: salvaged stainless steel pile© Stephen Mallon salvaged stainless steel pile

The salvage pile.

A front-end loader heaps salvaged stainless into piles like this one, around 9 feet high. As the plant sifts its stream of automotive detritus, it creates similar mounds of aluminum and copper. The wire will require yet another processing step to tear the valuable metal loose from its plastic sheathing.


the inside of a building: saginaw metal casting alumium© Stephen Mallon saginaw metal casting alumium

Where scraps become engines.

At Saginaw Metal Casting, GM turns 95 percent reclaimed aluminum, originating from scrappers like Padnos, into V6 engine components. The sandcastle-shaped objects arrayed at left? They’re the part of the molds that will form cylinders in an engine block. (And yes, they are made of sand.) It takes 19 pieces to fashion a complete block.


a close up of an old building: furnace melting aluminum© Stephen Mallon furnace melting aluminum

The furnace at Saginaw Metal Casting.

This furnace is the scorching heart of the foundry. Inside, two gas-fueled jets heat metal to 1,300 degrees. ­Thousand-​pound hunks of aluminum, or sows, sit in the 19-foot-wide maw and melt into a hot tub of molten metal. From here, the lava flows down a system of heated passageways to be cast.


a close up of an engine: BFR metal casting robot© Stephen Mallon BFR metal casting robot

One of more than 100 robots in the factory.

Meet the BFR. The “B” is for “big,” the “R” is for “robot,” and we can’t note what the “F” is for. This contraption—the biggest of more than 100 bots in the factory—casts one engine block per minute. It picks up a mold (foreground), fills it with liquid aluminum, and then sets it onto a conveyor to the basement to cool.


recycled aluminum piston© Stephen Mallon recycled aluminum piston

The completed engine blocks.

Humans and robots crank out 800 blocks a day. From Saginaw, they and other parts will head to a plant near Detroit, where technicians install pistons and fuel-management systems, among other final touches. Once complete, the engines will power Cadillacs, Chevys, and GMCs—until those cars, too, perish.

This article was originally published in the Summer 2018 Life/Death issue of Popular Science.

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