There was only the sound of our own, exhausted strokes cutting into the tide.

The extra spark on the exhaust stroke has no effect and is thus "wasted".

Following the exhaust stroke, the intake valve is prevented from opening.

He heard the cylinders wheeze as one took in gas and another hissed on the exhaust stroke.

A single-acting bellows will only produce airflow during the exhaust stroke.

Finally, the piston rises on the exhaust stroke to expel burned gases.

The power stroke and exhaust stroke require another rotation.

In a typical engine, it requires only about 2-3 kV to fire the cylinder on the exhaust strokes.

If they don't fire, there is not exhaust stroke and there is no new intake stroke.

It was a four-stroke cycle gas internal combustion engine with intake, compression, power, and exhaust strokes.

It has a series of cams along its length, each designed to open a valve during the appropriate part of an intake or exhaust stroke.

The 360 twins can have a single ignition system for both cylinders, with a wasted spark on each cylinder's exhaust stroke.

It also improves volumetric efficiency, because there is less exhaust gas to be expelled on the exhaust stroke.

When an engine starts its exhaust stroke, the piston moves up the cylinder bore, decreasing the total chamber volume.

Because the trigger is on the flywheel instead of the cam, the ignition will fire on both the compression and exhaust strokes.

However it is more difficult to achieve in two-stroke engines, owing to the proximity, or even overlap, of their induction and exhaust strokes.

The piston continued its exhaust stroke until top dead center (TDC) was reached, but the valve did not close.

Exhaust Stroke: Phase of the four-stroke cycle when waste gases are pushed out the exhaust valve.

The piston rises, expelling exhaust gases through the exhaust valve (the exhaust stroke).

The exhaust release point occurs earlier in the power stroke and compression earlier in the exhaust stroke.

After the opening of the exhaust valve, the exhaust stroke follows, but this (and the following induction stroke) are not shown on the diagram.

And if the exhaust valves open slightly early in high-speed operation, that prevents the cylinder from repressurizing in the exhaust stroke, which would cut power.

At very high engine loads, AVCS advances the intake valves further to open even sooner during the exhaust stroke.

A spurt of air into the exhaust port of each cylinder at its exhaust stroke encourages a longer, and therefore cleaner, burning of fuel.

These are not considered as wasted spark systems, as their sparks all take place after the useful compression stroke, rather than "wasted" in the exhaust stroke.