Engine size and measurements

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What is a typical pressure in psi in an engine?

125-175 psi

Force

A push or pull exerted on an object

Prony brake

A simple dynamometer that uses friction.

mechanical efficiency

All of the ways friction is lost in an engine.

oversquare engine

An engine that has a larger bore diameter than the length of its stroke.

undersquare engine

An engine that has smaller bore diameter than the length of the stroke.

BTU

British Thermal Unit

What determines engine size?

By multiplying the amount the cylinder displacement by the amount of cylinders.

work

Force exerted on an object that causes it to move

Road horsepower

Horse power avaliable at the vehicle´s drive wheels.

Chassis dynamometer

Measures the horsepower delivered to the drive wheels. As well as the fuel consuption, emissions, or noises.

How is force measured?

Newtons

gross horsepower

Power avaliable when only the water pump and the alternator are using power.

Energy

The ability to produce motion against an opposing.

compression pressure

The amount of pressure made by the pistons moving up and down.

indicated horsepower

The amount of pressure mde in the combustion chamber.

bore

The diameter of the cylinder and is measured across the cylinder.

piston stroke

The distance the piston slides up or down from the TDC to the BDC

Net horsepower

The maximum power avaliable from the engine when all acessories are turned on.

frictional horsepower

The power lost due to friction

Mommentum

The product of an object's mass and velocity

thermal efficiency

The ratio of how effectivly an engine converts fuel into usable work.

Swept Volume

The swept volume of the number cylinders. This is determined by multiplying.

Inertia

The tendency of an object to resist a change in motion

Crank Throw

The throw of the rod journal.

Brake Horsepower

The usable horsepower at the crankshaft

engine displacement

The volume displaced by all the pistons in an engine.

What is cylinder displacement?

The volume that the piston displaces from TDC to BDC

purpose

To measure how much torque an engine can produce.

Engine Dynamometer

Used to measure the brake horsepower of modern car engines

How is pressure measured?

a barometer in pounds per inch

horsepower

a measure of an engine's power based on how much weight a horse can pull

BMEP

brake mean effective pressure

How do you determine the effciency of an engine?

by pressure

Volumetric efficiency

the efficiency with which the engine can move the charge of fuel and air into and out of the cylinders

What is Mean Effective Pressure?

the pressure within the cylinder that increases during the compression stroke and becomes highest after ignition.

Power

the rate of doing work

How is temperature measured?

thermometer


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