However, since piston-engined aircraft rely upon magnetos to provide spark to their cylinders rather than a battery powered ignition coil system, this theory is not strongly convincing.

As well as the high level of compression allowing combustion to take place without a separate ignition system, a high compression ratio greatly increases the engine's efficiency.

Ford's HyTrans Project has developed a system which starts the ignition in 400 ms, saving a significant amount of fuel on city routes, and there are other methods to achieve even more efficient combustion, such as homogeneous charge compression ignition, being studied.

However, the success of the XM-291 doesn't imply the success of ETC technology as there are key parts of the propulsion system that are not yet understood or fully developed, such as the plasma ignition process.

The matchlock musket or pistol ( an early gun ignition system ), as well as the flintlock would often be unusable in wet weather, due to powder in the pan being exposed and dampened.

Most truck and automotive diesel engines use a cycle reminiscent of a four-stroke cycle, but with a compression heating ignition system, rather than needing a separate ignition system.

* In Volvo automobiles, lambda denotes an engine, fuel, or ignition system failure.

This is because a magneto ignition system is more reliable than a battery-coil system.

Such a system is known as an " energy transfer " ignition system.

Because it requires no battery or other source of energy, the magneto is a compact and reliable self-contained ignition system, which is why it remains in use in many general aviation applications.

On the other hand, battery ignition systems have almost always had a timing advance system which can set the timing to the best setting for the speed the engine is turning, improving power output and fuel efficiency.

McVeigh then added a dual-fuse ignition system accessible from the truck's front cab.

** Bosch EZF ignition system using dual distributors makes debut.

** Updated LH-Jetronic injection and ignition changed to EZK system, two knock sensors added to engine.

** Digital trip computer / warning system added to dashboard, ignition circuit monitor system added.

** Temperature sensors for ignition circuit monitor system moved from # 4 and # 8 cylinders to # 3 and # 7 cylinders to improve their efficiency.

By using a smaller turbocharger running at increased boost, slightly higher compression of 8: 1 and an improved fuel injection system with DITC ignition triggered by the flywheel, reliability improved and power rose to.

The purpose of these tools is to achieve a more equal distribution of flame from the primer to ignite the powder charge, resulting in consistent ignition from case to case.

However, as estimates of the energy required to reach ignition grew dramatically during the 1970s and ' 80s, these hopes were abandoned.

If sharp objects, such as nails or broken glass, are added inside the bomb in an attempt to increase the amount of injury, these also add to the risk of premature ignition.

In both these types the cups are sealed with a lid through which the ignition source can be introduced.

On modern engines, equipped with electronic ignition and fuel injection, some or all of these tasks are automated, although they still require periodic calibration.

Throughout these efforts, the amount of energy needed to reach ignition had continually risen and it was unclear whether the current 200 kJ estimate was more reliable than earlier ones.

Their report suggested that the primary goal of the program in the short term should be resolving the various issues related to ignition, and that a full-scale LMF should not be attempted until these problems were resolved.

The Lamborghini V-12 engine has both these adaptations and therefore uses two ignition coils and a single distributor that contains 4 contact breakers.

Electronic ignition ( EI ) solves these problems.

The arrival of electronic ignition in 1986 put an end to these problems.

The range's first major facelift for 1972 brought an uprated motor with new carburettor and ignition tuning, re-profiled camshaft and a plastic air cleaner housing ( these models were always harder to keep in tune than their predecessors ), smaller, squarer headlamps, a new dashboard with deeply hooded round dials ( the Hunters had strip speedometers previously ), high-backed front seats, and a revised silver trim panel surrounding the tail lights.

Typically, these alarms have inputs for power and ground, as well as for positive-and negative-switched door open circuits, negative trunk and / or hood circuits, and ignition-switched circuits to detect the ignition being turned on ; aftermarket alarms also usually have a shock sensor which may be built into the control module or external to it.

Steel media may spark, becoming an ignition source for these products.

Because alcohol boils at 78 ° C ( 172 ° F ), water boils at 100 ° C ( 212 ° F ) and sugar caramelizes at 170 ° C ( 338 ° F ), ignition of all these ingredients combined results in a complex chemical reaction, especially as the surface of the burning alcohol exceeds 240 ° C ( 500 ° F ).

No matter the quantity, care must always be taken to prevent any electrostatic discharge or friction during mixing or handling, as these may cause accidental ignition.

In the Japanese market, 400 cc motorcycles were once restricted by top speed, but these restrictions can be removed through various means, including the fitting of an ignition " black box ".

In addition to thermite, thermate also contains sulfur and sometimes barium nitrate, both of which increase its thermal effect, create flame in burning, and significantly reduce the ignition temperature Various mixtures of these compounds can be called thermate, but to avoid confusion with thermate-TH3, one can refer to them as thermite variants or analogs.

Immediately before ignition of the rocket's motors all connections between the tower and the craft are severed and the bridges over which these connections pass often quickly swing away to prevent damage to the structure or vehicle.

All of these were cast pistons and had low endurance and would often fail when subjected to high compression and advanced ignition timing compared to custom forged pistons.

* Blending fuels upstream of the engine: Two fuels are mixed in the liquid phase, one with low resistance to ignition ( such as diesel fuel ) and a second with a greater resistance ( gasoline ), the timing of ignition is controlled by varying the compositional ratio of these fuels.

* Having two fuel circuits: Fuel A can be injected in the intake duct ( port injection ) and Fuel B using a direct injection ( in-cylinder ) event, the proportion of these fuels can be used to control ignition, heat release rate as well as exhaust gas emissions.

With these solutions in hand, LLNL decided to build a device with the power needed to produce ignition conditions.

" Their report suggested that the primary goal of the program in the short term should be resolving the various issues related to ignition, and that a full-scale LMF should not be attempted until these problems were resolved.

STS-51-F's first launch attempt on 12 July 1985 was halted with the countdown at T-3 seconds after main engine ignition, when a malfunction of the number two Space Shuttle Main Engine ( SSME ) coolant valve caused the shutdown of all three main engines.

Diesel engines on the other hand operate on the principle of compression ignition, so that a fuel which resists autoignition will cause late ignition which will also lead to engine knock.

Recently, with the addition of variable valve timing and knock sensors to delay ignition timing, it is possible to manufacture gasoline engines with compression ratios of over 11: 1 that can use 87 ( MON + RON )/ 2 ( octane rating ) fuel.

Note that such engines may not produce their full rated power using 87 octane gasoline under all circumstances due to the delayed ignition timing.

Direct fuel injection which can inject fuel only at the time of fuel ignition ( similar to a diesel engine ) is another recent development which also allows for higher compression ratios on gasoline engines.

Some 19th-century or earlier experimental engines used external flames, exposed by valves, for ignition, but this becomes less attractive with increasing compression.

Internal combustion engines require ignition of the mixture, either by spark ignition ( SI ) or compression ignition ( CI ).

Experimental engines with laser ignition have been built.

Diesel engines and HCCI ( Homogeneous charge compression ignition ) engines, rely solely on heat and pressure created by the engine in its compression process for ignition.

When running at lower speeds, quenching is commonly observed in diesel ( compression ignition ) engines that run on natural gas.

The use of ignition magnetos is now confined mainly to engines where there is no available electrical supply, for example in lawnmowers and chainsaws.

As the size of the combustion chamber determines the time to burn the fuel charge, dual ignition was especially important for the large-bore aircraft engines around World War II.

As the reliability of battery ignition systems improved, the magneto fell out of favor for general automotive use, but may still be found in sport or racing engines.

It is often asserted that rotary engines had no carburetor and hence power could only be reduced by intermittently cutting the ignition using a " blip " switch.

It was derived from a previous, unsuccessful Curtiss-Wright design, which failed because of a well-known problem with all internal combustion engines: the fixed speed at which the flame front travels limits the distance combustion can travel from the point of ignition in a given time, and thereby limiting the maximum size of the cylinder or rotor chamber which can be used.

* 1970s – electronically controlled ignition appears in automobile engines.