Timing Chain Auto-tensioner
The timing chain auto-tensioner uses a spring and engine oil pressure to maintain proper tension at all times. It also suppresses noise from the timing chain. Using an internal Read more Engine Auto Tensioner
Gasoline Engine
Engine Piston Ring
1. Description
The piston ring is designed to prevent pressure from leaking out of the gap between the piston and the cylinder. There are three piston rings that function to keep the combustion chamber Read more Engine Piston Ring
Engine Valve Mechanism
The valve mechanism opens or closes the intake valve and exhaust valve at the proper timing in order to draw the air-fuel mixture into the cylinder and discharge the combustion gas into the outside.
Ignition Performance
The following factors affect the ignition performance of a spark plug:
1. Electrode shape and discharge performance
Rounded electrodes make discharging difficult, while squared-off or pointed electrodes Read more Ignition Performance
Engine Scissors Gear Mechanism (Sub-gear Mechanism)
There is a scissors gear (sub-gear) on the driven gear of the camshaft for the compact DOHC which serves to reduce gear noise associated with changes in torque. The sub-gear is pushed toward the rotational Read more Engine Scissors Gear Mechanism (Sub-gear Mechanism)
Engine Temperature-controlled Fluid Coupling
1. Overview
The V-belt driven cooling fan increases in fan speed in proportion to the increase in engine speed. For this reason, the fan speed of the cooling fan with the temperature control fluid coupling Read more Engine Temperature-controlled Fluid Coupling
EngineElectric Motor-driven Cooling Fan
1. Outline
It is necessary for a large volume of air to pass through the radiator for it to release the heat. Ordinary driving provides an adequate air flow for cooling, however when the vehicle is Read more EngineElectric Motor-driven Cooling Fan
Elements of a Gasoline Engine
All gasoline engines mounted on Toyota automobiles are four-stroke engines. Four-stroke engines operate by continuous and regular repetition of the following sequence:
1. Intake stroke
2. Compression Read more Elements of a Gasoline Engine
Three Elements of Gasoline Engines
1. Good air-fuel mixture for automobiles
(1) Gasoline is vaporized and sufficiently mixed with air In order for gasoline to completely burn, it must be sufficiently vaporized and mixed with air.
What is a GoodEngine Compression?
Necessity of compressing the airfuel mixture
When an uncompressed air-fuel mixture is ignited, it burns slowly due to the low density of fuel and air. However, when compressed air-fuel mixture is ignited, Read more What is a GoodEngine Compression?