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Oblique Crash Test
A newer crash test where two cars collide at right angles to one another as opposed to head-on. This test is more representative of common passenger car accidents as most collisions occur at some kind of angle.
Octane is a rating of a fuels resistance to ignite. The higher the octane, the harder it is to get to ignite. A higher octane may be necessary to prevent pre-ignition and detonation in a high performance engine. Higher octane fuel will generally burn slightly slower than a lower octane fuel which could require a change in ignition timing. Using more octane than you need will not help power, the slower burn rate will actually cause you to lose some power.
Octane Rating (R+M)/2
This is what you get at the gas pumps. It is average of the RON and MON. It is ok to use this for lower compression street motors, but when you get much over 10:1, you should really pay attention to the MON. The closer the RON is to the MON, the more stable the fuel is. This can be very critical when running 7000+ rpm.
Original Equipment Manufacturer. An OEM part is obtained from the original manufacturer's parts counter.
Vehicle intended for operation on unmade surfaces or rough terrain (i.e. for construction or agriculture).
Engine oil comes in various ratings SAE 5W-30, 10W-30, 10W-40, etc. For example, a 10W-30 rated oil will flow like a light SAE 10-weight oil at low temperatures. The W signifies that it is a winter rated oil. The 30 designation means that at engine operating temperatures, the oil will behave like a heavier SAE 30-weight oil. Low viscosity at colder temperature allows the oil to circulate more quickly and protect vital engine parts. Higher oil viscosity at elevated temperatures prevents direct metal-to-metal contact.
An engine-driven pump that delivers oil, under pressure, to the engine's moving parts.
The lowermost piston ring that scrapes off excess oil from the cylinder walls and returns it to the oil pan via vents in the ring and piston.
Oil that is not derived from raw petroleum. Synthetic oil has superior engine protection properties compared to conventional mineral oil. Synthetic oil costs 3-5 times more than mineral oil.
On-Board Diagnositcs (OBD)
A unit that monitors the Electric Control Unit and system responses for errors during normal vehicle operations. When the vehicle is serviced, this information on the errors can be down loaded and displayed to the service personnel which will facilitate the trouble shooting process.
The responsiveness and feel of the steering when the wheel is approximately centered. In a car with good on-center feel, the steering wheel tends to return to center when slightly deflected, assisting straight-line stability.
A technique in which the steering wheel is turned in the direction away from where the car is turning. Opposite lock is used to control a car when it is oversteering and its tail is swinging wide.
When a car is painted, if the paint mix is not correct, or if the painter has not properly prepared the surface before painting, the resulting paint surface may look bumpy, similar to the skin of an orange. Orange peel can often be removed by wet-sanding or machine polishing.
To safely machine polish and wax cars, many home detailers and pro detailers use a random orbit polisher. An orbital polisher is a light machine, usually with variable speed settings, used to apply and remove polishes, glazes, and waxes. Unlike a direct drive buffer, an orbital polisher has a special head that rotates in a random (figure 8), circular motion.
The situation where maximum global prodution of automobiles exceeds the total global demand for automobiles.
Any gearset in which the output shaft turns faster than the input shaft. Overdrive gears are used in most modern transmissions because they reduce engine rpm and improve fuel economy. Occasionally, a separate gearbox with an overdrive gearset is coupled to a conventional transmission.
Overhead Cam (OHC)
The type of valvetrain arrangement in which the engine's camshaft(s) is in its cylinder head(s). When the camshaft(s) is placed close to the valves, the valvetrain components can be stiffer and lighter, allowing the valves to open and close more rapidly and the engine to run at higher rpm. In a single-overhead-cam (SOHC) layout, one camshaft actuates all of the valves in a cylinder head. In a double-overhead-camshaft (DOHC) layout, one camshaft actuates the intake valves, and one camshaft operates the exhaust valves.
Overhead Valve (OHV)
Typically used to describe an engine where the valves are positioned higher than the camshaft, such as in a small-block chevrolet V8 engine.
Airborne particles that adhere to a finished surface. Overspray particles can include unwanted paint, industrial fallout, chemical contaminants, or other airborne particles.
A description of an engine whose bore is larger than its stroke.
A handling condition in which the slip angles of the rear tires are greater than the slip angles of the front tires. An oversteering car is sometimes said to be "loose," because its tail tends to swing wide.
The effects of weathering or outdoor exposure on painted surfaces. Oxidation results in a dull or hazy finish. It can be corrected by removing the oxidized layer of the finish. Depending on the severity of the oxidation, this may be accomplished using cleaner wax, rubbing compound, polish or a machine glaze.
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