A unit of measurement on a scale intended to indicate the tendency
of a fuel to detonate or knock based on the percentage of isooctane
in the fuel. The higher the rating, the higher the percentage of
isooctane and therefore the greater the resistance to detonation
offered by the fuel.
Vehicle intended for operation on unmade surfaces or rough terrain
(i.e. for construction or agriculture).
After Georg Simon Ohm, German (1787-1854). The ohm is a unit of
On Board Diagnostics
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
Open End Lease
A lease in which the lessor is not responsible for the value of
a vehicle when the lease is done. Under this arrangement the lessee
is responsible for the difference between the current actual market
value at the end of the lease and the residual value. Also known
as a "finance" lease.
A transmission in which the highest gear ratio is less than a one-to-one
ratio. This means the drive shaft turns faster than the engine crankshaft.
The overdrive feature saves fuel and, because the engine runs slower,
engine wear and noise are reduced.
The type of valve train arrangement in which the engine's camshaft
is mounted above the cylinder head(s). When the camshaft is placed
close to the valves, the valve train components can be stiffer and
lighter, allowing the valves to open and close more rapidly and
the engine to run at a higher RPM. In a single overhead cam (SOHC)
layout, one camshaft actuates all of the valves in a cylinder head.
In a dual overhead camshaft (DOHC) layout, one camshaft actuates
the intake valves, and one camshaft operates the exhaust valves.
Overhead Valve Engine
An engine with both intake and exhaust valves placed directly over
the piston. In this design, the camshaft is located in the block,
and the valves are actuated by pushrods and rocker arms.