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Idle Speed - The RPM of the engine free from load (all accessories off), at normal operating temperature and in neutral (or, in the case of an automatic transmission, park or neutral).
Idler Pulley - A guide or tightening pulley for a belt or chain.
Ignition Timing - The process of setting the time that a spark will occur in the combustion chamber (during the power stroke) relative to piston position and crankshaft angular velocity.
Inboard Brakes - A braking system that is located within the chassis of a vehicle instead of at its hubs.
In-Car Cellular Phone - A cellular phone that either has a handset built into the vehicle or is a portable unit with an accompanying dock built into the vehicle that enables operation through the vehicles entertainment and stereo system.
Incentive - Any kind of financial assistance from a vehicle manufacturer that, by reducing either the net price or the cost of financing/leasing, motivates customers to buy/lease a new vehicle. The most common incentives are customer cash rebates, low-interest financing and leases that are subsidized by the manufacturer.
Incentives and Rebates - An auto industry term that encompasses all methods by which manufacturers attempt to stimulate vehicle sales and leases by reducing the net cost to consumers without reducing the vehicles MSRPs, which includes customer rebates, dealer cash incentives and special leases.
Individual Monitors - More than one video monitor in the rear passenger area of a vehicle with a rear seat entertainment system.
Ignition - the mechanism that ignites the fuel in an internal-combustion engine.
IndyCar - IndyCar is an American-based open-wheel auto racing sanctioning body. IndyCar sanctions three racing series, the premier IZOD IndyCar Series with its centerpiece Indianapolis 500, and developmental series Firestone Indy Lights and the U.S. F2000 National Championship, which are both a part of The Road To Indy. It was formerly known as the Indy Racing League (IRL) before 2011. IndyCar is owned by Hulman and Co., which also owns the Indianapolis Motor Speedway complex and the Clabber Girl brand.
Inherently Low-Emission Vehicle (ILEV) - An emissions standard for alternative-fuel vehicles with closed and pressurized fuel systems.
Instrumentation - Digital and/or analog displays used to convey to the driver information such as dynamic engine parameters, operating conditions, RPM, speed and water temperature. Also referred to as gauges.
Instrumented Testing - The analysis of a vehicles performance characteristics using precise scientific equipment.
Insurance Institute for Highway Safety - An organization created by the insurance industry for the purpose of reducing the losses (deaths, injuries and property damage) from vehicle crashes. Sometimes referred to as the "IIHS."
Integrated Turn Signal - A turn signal light that is mounted on or in a vehicles sideview mirror.
Intelligent Alternator - An alternator that operates primarily when the engine has no need for power, i.e., when coasting or during braking. The alternator remains passive while the vehicle is under power, with needed electrical power provided by the battery, for the purpose of improving the vehicles fuel efficiency.
Intelligent Car - A vehicle that employs the latest in telemetrics, driver awareness and/or pedestrian safety technology.
Intercooler - A heat exchanger that cools the air or intake charge in a forced induction system.
Interior Lighting - Halogen lamps or light-emitting diodes (LEDs) used to illuminate a vehicles interior space.
Interior Trim - Wood, composite, leather or metal adornments intended to supplement the aesthetic elements of a vehicles interior.
International Hot Rod Association (IHRA) - The IHRA was formed in November 1970 by businessman Larry Carrier. Throughout this period the organization was operated primarily in the south-eastern United States from its headquarters in Bristol, Tennessee. IHRA headquarters briefly moved to Waco, Texas in 1988 after it was purchased by Texan racer and track operator Billy Meyer who made many changes to the organization. In 1998 the organization was purchased by Bill Bader who significantly expanded the promotion in the Great Lakes from his headquarters in Norwalk, Ohio. He sold the IHRA to Clear Channel Communications, but remained as president until his retirement in October 2004. The headquarters remain in Norwalk, which was once the site of the IHRA's flagship World Nationals event.
The IHRA is currently owned by Feld Entertainment, who bought the Motor Sports division of Live Nation, itself a spin-off of Clear Channel's live event business.
Invoice - The price that appears on the invoice that the manufacturer sends to the dealer when the dealer receives a vehicle from the factory. Also known as the "Invoice Price."
Here is a list of various Automotive Definitions. These are not specific to just Classic Cars, but covers all Automotive Definitions in general. This is not an all inclusive list and as we come across more, we will add them here. Drop us a note if you see something we missed.
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