When I was about 12 years old and just getting interested in engines I heard my uncle swear that he got a stuck piston out of a motorcycle he had by using bottle of Coke. It had set out in the yard all winter and had rusted up inside. But we all know pop is sticky, water based and wouldn’t it make a worse mess? After all, Mom always said “don’t spill your pop, it will make everything sticky”.
As I grew up and got interested in cars and motorcycles myself I started to hear of other such “urban legends” and decided, hey, maybe there is something to this. The people that said it worked were quite insistant, and there sure was no proof that it did NOT work. So I decided to investigate. (amazing what little it takes to entertain me)

So here is what I’ve found – many carbonated beverages will remove rust. This is because the gas used, carbon dioxide when mixed with water, makes carbonic acid. To make rust, the iron oxidizes – it combines with oxygen. This is why rust is also called iron oxide. The carbonic acid reverses this reaction – this reversal is called “reduction.” Here’s a better reason – take a look at your Coke can – it has phosphoric acid as an ingredient. Phosphoric acid is the basis of Naval Jelly, a commercial product used for rust removal. Phosphoric acid dissolves iron oxide very quickly while etching metallic iron very slowly so you can leave metal in phosphoric acid with little damage.

The downside is that all acids contribute some hydrogen to the metal structure, weakening the steel by hydrogen embrittlement – so always use only as much time as is absolutely necessary to remove the rust. An advantage of phosphoric acid is that it leaves a fine protective coating of iron phosphate. Because this coating is not thick or durable some protection is still required. Years ago supposedly Volkswagon use a process of phosphating metal prior to painting as it provided a chemical protection against rust under the paint layer.
So, spilling your Coke into your old engine wouldn’t really be a bad thing if you were trying to remove some rust.

Sourced and published by Henry Sapiecha 27th April 2010

BACKGROUND: The German-American consortium of BMW, DaimlerChrysler and General Motors are developing a new type of two-mode hybrid system for a wide range of cars, trucks and SUVs, starting with the 2008 Chevrolet Tahoe available in fall 2007. Current hybrids perform well in stop-and-go city driving, but don’t get as good mileage on the highway. The new hybrid version will get 25 percent better mileage in combined city and highway driving.

ADVANTAGES: Current hybrid engine systems have a single mode of operation, using a single gear set to split the engine’s power into two systems — routing it to drive the wheels or charge the battery — for both city and highway driving. Like other hybrids, the two-mode combines the power of a gasoline engine with that of electric motors, capturing energy from braking that would otherwise be lost and shutting off the engine at a stop. The battery alone can power the vehicle at low speeds. The new technology can operate much more efficiently at highway speeds with a greater boost from the electric motors, shutting down half the cylinders when not needed, thereby improving gas mileage. The components of the new two-mode system are also lighter and more compact, making them especially useful for reducing overall fuel consumption.

BATTERY BASICS: Whenever one type of matter converts into another, as in a chemical reaction, one form of energy also changes into another. A battery has two ends, called terminals, one with a negative charge, and one with a positive charge. Electrons congregate on the negative terminal. Connect a wire between the two terminals, and the electrons will flow from the negative to the positive end as quickly as they can. Connecting the battery starts the flow of electrons, jumpstarting a series of chemical reactions inside the battery to create even more electrons.

HOW FUEL CELLS WORK: Just like batteries, a fuel cell is a device that uses chemical reactions to convert hydrogen and oxygen into water, producing electricity in the process. A battery eventually goes dead when all the chemicals are used up, but in a fuel cell, there is a constant flow of chemicals into the cell. The voltage produced by fuel cells can be used to power lights, electrical appliances, and laptops, as well as cars and trucks. Fuel cells are light, more efficient than internal combustion engines, and don’t produce damaging emissions. They are currently expensive to manufacture, however.

Sourced and published by Henry Sapiecha 14th April 2010