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Event in a spark-ignition engine
Pre-ignition (or preignition) in a spark-ignition engine is premature ignition of the air/fuel mixture in the cylinder, before the spark plug fires. Pre-ignition
Pre-ignition
Event in gasoline vehicle engines
Low-speed pre-ignition (LSPI), also known as stochastic pre-ignition (SPI), is a pre-ignition event that occurs in gasoline vehicle engines when there
Low-speed_pre-ignition
Problem in internal combustion engines
destructive. Knocking should not be confused with pre-ignition—they are two separate events. However, pre-ignition can be followed by knocking. The phenomenon
Engine_knocking
Type of internal combustion engine that uses compression to create combustion
A diesel engine is an internal combustion engine in which ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due
Diesel_engine
Form of internal combustion
ignition (HCCI) is a form of internal combustion in which well-mixed fuel and oxidizer (typically air) are compressed to the point of auto-ignition.
Homogeneous charge compression ignition
Homogeneous_charge_compression_ignition
Standard measure of the performance of an engine or aviation fuel
confused with pre-ignition – they are two separate events with pre-ignition occurring before the combustion event. However, pre-ignition is highly correlated
Octane_rating
Timing of the release of a spark in a combustion engine
In a spark ignition internal combustion engine, ignition timing is the timing, relative to the current piston position and crankshaft angle, of the release
Ignition_timing
1989 studio album by Voivod
Stravinsky's "The Rite of Spring", specifically the centre section of "Pre-Ignition". A music video made for the album's third track, a cover of Pink Floyd's
Nothingface_(Voivod_album)
Diesel engine with a turbocharger
increases the compression ratio, which, in a petrol engine, can cause pre-ignition and high exhaust gas temperatures. However, in a diesel engine, fuel
Turbo-diesel
Internal combustion engine type
self-ignition temperature. There are several ways to do this. As engines are designed with higher compression ratios the result is that pre-ignition is
Four-stroke_engine
Engine management system
is an engine management system in the Saab Trionic range. It controls ignition, fuel injection and turbo boost pressure. The system was introduced in
Trionic_T5.5
Air compressor for an internal combustion engine
temperatures can cause pre-ignition or knocking, which reduces performance and can cause engine damage. The risk of pre-ignition/knocking increases with
Supercharger
Turbo layout that uses two turbochargers
sometimes use this configuration, since diesel engines do not suffer from pre-ignition issues and can therefore use high boost pressures. Boost gauge Boost
Twin-turbo
Internal combustion engine
vibrator-coil ignition; the engine would be started on petrol (gasoline) and switched over to oil after warming to running temperature. The pre-heating time
Hot-bulb_engine
Reprogramming a car to improve performance
cope with advanced timing, one must run high-octane gasoline to avoid pre-ignition detonation or pinging. Manufacturers design for a specific timing and
Chip_tuning
Topics referred to by the same term
LSPI may refer to: Low-Speed Pre-Ignition, a pre-ignition event that occurs in gasoline vehicle engines LiquidPower Specialty Products Inc., a Berkshire
LSPI
Device that generates sparks in internal combustion engines
device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture
Spark_plug
Agent used to increase a fuel's octane rating
"pinking") and/or to ignite early before the correctly timed spark occurs (pre-ignition, refer to engine knocking). Notable early antiknock agents, especially
Antiknock_agent
Concept in engine design
air means that higher compression ratios can be used without a risk of pre-ignition. Therefore, the use of turbochargers on diesel engines is relatively
Forced_induction
Sports motorcycle
intercooler (which the H2 lacks), excess heat in the intake charge can cause pre-ignition that can damage or destroy the engine. Electronic rider aids include
Kawasaki_Ninja_H2
Combustion engine using an eccentric rotary design
emissions. At the same time, HC emissions can be lowered by reducing the pre-ignition of the T leading plug relative to the L trailing plug. This leads to
Wankel_engine
2010 video game
download with pre-orders of Dead Space 2, unlocking a new costume and story content within that game upon completion. Reception of Ignition was generally
Dead_Space_Ignition
U.S. atomic bomb type used at Nagasaki, 1945
neutrons when bombarded with alpha particles, which would exacerbate the pre-ignition problem. The metallurgists then hit upon a plutonium–gallium alloy, which
Fat_Man
Motor vehicle
with a detonation (knock) sensor, able to retard the ignition in case of near catastrophic pre-ignition. There were four overhead camshafts driving two valves
Ferrari_328
Type of drag racing motorsport
increased by using very rich air-fuel mixtures. This also helps prevent pre-ignition, which is often a problem when using nitromethane. Because of the relatively
Top_Fuel
Light machine gun
the casings are ejected to the left. As a rule, the Lmg fires with pre-ignition, i.e. H. the shot is released when the locked system is still in advance
Lmg_25
German sports car built 1976–1988
helped better accommodate the KK&K K-26 turbocharger without inducing pre-ignition. Platinum tipped spark plugs were also used, and exhaust valve diameter
Porsche_924
Type of biofuel
control computer can also adjust (advance) the ignition timing to achieve a higher output without pre-ignition when it predicts that higher alcohol percentages
Ethanol_fuel
American chemist (1929–2004)
Engineering Data, Radiation Research, and Analytical Chemistry. "Pre-ignition and Ignition Reactions of the System Barium Peroxide–Magnesium–Calcium Resinate"
Virginia_D._Hogan
Range of automobiles produced by Toyota (1968–2007)
unchanged from the 1984 model year but gained a knock-sensor, which detected pre-ignition and adjusted timing accordingly when a lower-grade fuel was used. Later
Toyota_Mark_II
Motor vehicle model, 1991–1995
mixing of the charge, very high speed flame propagation at ignition, high resistance to pre-ignition (knock), and very low amounts of unburned hydrocarbons
Honda Civic (fifth generation)
Honda_Civic_(fifth_generation)
Colourless non-flammable greenhouse gas
and evenly spread operating temperatures and fuel levels to prevent pre-ignition (also called detonation or spark knock). However, most problems associated
Nitrous_oxide
Heat exchanger used to cool a gas after compression
injected, resulting in increased power) and less likely to suffer from pre-ignition or knocking. Additional cooling can be provided by externally spraying
Intercooler
Formula One racing car
much-revised water cooling through the cylinder head reducing the likelihood of pre-ignition (detonation). Power figures for this period of F1 history are largely
Lotus_98T
Organolead compound
fuel of sufficient octane rating to prevent uncontrolled combustion (pre-ignition and detonation). Antiknock agents allow the use of higher compression
Tetraethyllead
Type of electrical switch
(or "points") is a type of electrical switch, found in the ignition systems of spark-ignition internal combustion engines. The switch is automatically operated
Contact_breaker
Type of motorcycle
severe pre-ignition (knocking) in high-performance engines. To improve combustion efficiency while eliminating the possibility of pre-ignition, Yamaha
Yamaha_XS_Eleven
Chemical compound
the temperature of combustion chamber hot parts in order to control pre-ignition and subsequent detonation. Operational details depend on the particular
Nitromethane
Type of internal combustion engine
describes a certain type of internal combustion engine, usually a spark ignition (SI) engine that can be used in trucks, automobiles, portable and stationary
Stratified_charge_engine
Ranged incendiary device
leads to an ignition chamber behind the exit of the gun assembly, where it is mixed with air and ignited through piezo ignition. This pre-ignition line is
Flamethrower
Pipe-based cannon
(256 gr) 20 mm plastic slug from a hybrid using a 20 MPa (2,900 psi) pre-ignition mixture of air and propane. Supersonic velocities have been obtained
Potato_cannon
Reciprocating internal combustion engine
now utilising an experimental system known as Turbulent Jet Ignition or Pre-Chamber Ignition, which greatly increased power and efficiency potential, along
Honda V6 hybrid Formula One power unit
Honda_V6_hybrid_Formula_One_power_unit
Isotope of plutonium
Elements. Şahin, Sümer (1981). "Remarks On The Plutonium-240 Induced Pre-Ignition Problem In A Nuclear Device". Nuclear Technology. 54 (1): 431–432. doi:10
Plutonium-240
engine effects produced by abnormal combustion (engine knocking and pre-ignition) due to inferior fuels had not yet been identified, and as a result,
History_of_gasoline
becoming too hot and either igniting before reaching the cylinders (pre-ignition knocking) or creating a condition known as knocking or detonation. The
Supermarine Spitfire variants: specifications, performance and armament
Supermarine_Spitfire_variants:_specifications,_performance_and_armament
American science advisor and university president (1915–1994)
first-generation Jewish parents from Silesia Wiesner, Jerome Bert (1950). Pre-ignition phenomena in gas switching tubes and related rectifier burnout problems
Jerome_Wiesner
Form of natural gas for easier storage and transport
interactions of cylinders, compression ratios, and fuel injectors such that pre-ignition is prevented but at the same time as much fuel as possible can be injected
Liquefied_natural_gas
Combustion chamber capacity ratio
(petrol) engines subject to engine knocking (also known as "detonation", "pre-ignition", or "pinging") if lower octane-rated fuel is used. This can reduce efficiency
Compression_ratio
the engine from modes of operation that may induce self-damage such as pre-ignition. Such systems may be referred to as engine control units. Many control
Component parts of internal combustion engines
Component_parts_of_internal_combustion_engines
Motor vehicle
blow-through twin-choke Weber carburetor and Marelli Microplex ignition with pre-ignition control. To withstand the additional stress deriving from turbocharging
Lancia_Delta
Aircraft engine part used by the US in WW2
the ADI fluid raises the mean octane level of the charge preventing pre-ignition and also lowers the cylinder temperatures to a more acceptable level
Bendix-Stromberg pressure carburetor
Bendix-Stromberg_pressure_carburetor
The Americas prior to European influence
In the history of the Americas, pre-Columbian era, also known as pre-contact era, pre-Hispanic or as pre-Cabraline era (the latter specifically framed
Pre-Columbian_era
German aircraft engine
corrosion resistant, and they began to scale in use. This scale then caused pre-ignition, which led to catastrophic detonation and eventually engine failure.
Daimler-Benz_DB_605
Early internal combustion engine design
so did the temperature of the bulb, causing the ignition period to advance; to counteract pre-ignition, water was dripped into the air intake. The Stuart
Hornsby–Akroyd_oil_engine
Automobile model made by Pontiac
enthusiasts and collectors in later years. The 301 also had a knocking (pre-ignition) problem that was later determined to be caused by the shape of the combustion
Pontiac_Grand_Prix
known as PPCI (partially-premixed compression ignition) or GDCI (gasoline direct-injection compression-ignition) is a modern combustion process intended to
Partially_premixed_combustion
Vehicle powered by natural gas
designing the cylinders, compression ratios, and fuel injectors such that pre-ignition is avoided, but at the same time as much fuel as possible can be injected
Natural_gas_vehicle
Chemical compound (C7H16)
lighter component in gasoline and burns more explosively, causing engine pre-ignition (knocking) in its pure form, as opposed to octane isomers, which burn
Heptane
Series of engine control units
these switches and retard the spark advance for vehicles experiencing pre-ignition (knock).[citation needed] The processor module featured a 10 volt reference
Ford_EEC
Type of early internal combustion engine
If gasoline vapor became too hot or was overly compressed, it risked pre-ignition or detonation before the spark plug could ignite it. Detonation, a leading
T-head_engine
Defunct American motor vehicle manufacturer
spots around the combustion chamber that could ignite the fuel, causing pre-ignition (knocks), which in turn limited the compression ratio. These engines
Crosley_Motors
Motor vehicle
position where the wastegate flap is stuck at, the symptom being low speed pre-ignition – LSPI – audible at low RPMs under load, which occurs even with 100 RON
Škoda_Rapid_(2012)
Organic compound
number (RON) than gasoline, meaning it is less prone to pre-ignition, allowing for better ignition advance which means more torque, and efficiency in addition
Ethanol
Former Shell research and development centre in Cheshire, England
investigated flame chemistry, engine knock, pre-ignition and the processes leading to spontaneous ignition of hydrocarbon fuels. In 1968 W. S. Affleck
Shell Technology Centre Thornton
Shell_Technology_Centre_Thornton
1960s roadster made by Nissan
iron head. Timing of the distributor could be easily adjusted to reduce pre-ignition knock and thereby tune for questionable quality gasoline. Engines in
Datsun_Sports
Dome-shaped combustion chamber within a cylinder head
Early versions proved fragile on the street and in competition due to pre-ignition (detonation), and oil loss, which led to decreasing the compression ratio
Hemispherical combustion chamber
Hemispherical_combustion_chamber
Type of fuel metering system for piston aircraft engines
The ADI system adds cooling water to the fuel-air mixture to prevent pre-ignition (detonation) in the engine cylinders when the mixture is leaned to a
Pressure_carburetor
Breathalyzer for an individual's vehicle
An ignition interlock device or breath alcohol ignition interlock device (IID or BAIID) is a breathalyzer for an individual's vehicle. It requires the
Ignition_interlock_device
Reciprocating internal combustion engine
as such, was fitted with an intercooler to help prevent the onset of pre-ignition and/or detonation. Fuel was delivered via Multiport Fuel Injection. Bore
Nissan_CA_engine
Video game series
originally released in 2002. The game would later have two sequels, Stuntman: Ignition (2007) and the upcoming Stuntman: Hollywood (TBA). The player must perform
Stuntman_(series)
Fabrication Şahin, Sümer (1981). "Remarks On The Plutonium-240 Induced Pre-Ignition Problem In A Nuclear Device". Nuclear Technology. 54 (1): 431–432. doi:10
Reactor-grade_plutonium
English engine design pioneer (1864–1927)
so did the temperature of the bulb, causing the ignition period to advance; to counteract pre-ignition, water was dripped into the air intake. Hot bulb
Herbert_Akroyd_Stuart
octane fuels allowed boost pressures to be increased without the risks of pre-ignition or knocking. Rather than use inches of mercury, the British measured
North American P-51 Mustang variants
North_American_P-51_Mustang_variants
Oil and natural gas trade association
a phenomenon experienced by some gasoline engines known as Low-Speed Pre-Ignition (LSPI). API also defines and drafts standards for measurement for manufactured
American_Petroleum_Institute
Type of cylinder head
efficiency of the engine. In a spark-ignition petrol engine the heat also increases the likelihood of pre-ignition or detonation which limits the allowable
Reverse-flow_cylinder_head
Reciprocating internal combustion engine
a twin-turbo port and direct injected V6 petrol engine with prechamber ignition, designed and produced by Maserati in its Modena plant since 2020. The
Maserati_Nettuno_engine
Dual-fuel Internal Combustion Engine
lower compression ratio of 8:1[dubious – discuss] or less, to avoid pre-ignition of the fuel-air mixture which would cause damage from engine knocking
Petrol-paraffin_engine
the "Mobil Power Compound" which was designed to increase power, check pre-ignition ping, correct spark plug misfiring, control stalling and combat gumming
History_of_ExxonMobil
Reciprocating internal combustion engine
additional 12° of centrifugal advance coming in above 4000 rpm. To prevent pre-ignition, a diaphragm on the distributor provided a pressure retard function rather
Chevrolet_Turbo-Air_6_engine
Exhaust emission control device
in late 2006 so they could continue selling pre-DPF vehicles well into 2007. For lean-burn spark-ignition engines, an oxidation catalyst is used in the
Catalytic_converter
Rocket engine developed by ISRO for upper stage of its LVM3 rocket
twentieth test that demonstrated ignition margin for Gaganyaan over a broad range of propellant tank pressure and pre-ignition chamber pressure, engine qualification
CE-20
Engine manufacturer
weak and rich mix to enable high compression ratios to be used without pre-ignition or pinking of the charge taking place. This was a precursor to Honda's
Weslake
Safety systems of boiling water reactors
thermal recombiners. Pre-inerting is considered impractical with larger containment volumes where thermal recombiners and deliberate ignition are used. Mark
Boiling water reactor safety systems
Boiling_water_reactor_safety_systems
Heating element used to aid in starting diesel engines
achieved by leaving the ignition switch in the "on" position, and only moving it to "start" once the glowplug has finished pre-heating the engine. Once
Glow_plug
Secret laboratory established by the Manhattan Project
neutrons when bombarded with alpha particles, which would exacerbate the pre-ignition problem. The metallurgists then hit upon a plutonium–gallium alloy, which
Project_Y
Test used in analytical chemistry
Loss on ignition (LOI) is a test used in inorganic analytical chemistry and soil science, particularly in the analysis of minerals and the chemical makeup
Loss_on_ignition
Hypothetical aircraft engine design
the valves. Valves were already reaching temperatures that would cause pre-ignition of the fuel as it flowed past them. Increasing operational speed is also
Hyper_engine
Firearm with flint-striking ignition
Flintlock is a general term for any firearm that uses a flint-striking ignition mechanism, the first of which appeared in France by Marin le Bourgeoys
Flintlock
1937 airship fire in the US
day. A variety of theories have been put forward for both the cause of ignition and the initial fuel for the ensuing fire. The publicity shattered public
Hindenburg_disaster
British automotive engineer
engine, resulting in a clearer understanding of the problems of knock and pre-ignition. Downs was made a Director of Ricardo in 1957. He was made managing director
Diarmuid_Downs
2014 video game
version of the game, titled Dengeki Bunko: Fighting Climax Ignition (電撃文庫 FIGHTING CLIMAX IGNITION, Dengeki Bunko Faitingu Kuraimakkusu Igunishion), was released
Dengeki Bunko: Fighting Climax
Dengeki_Bunko:_Fighting_Climax
Topics referred to by the same term
only in certain countries or with certain providers Lock (firearm), the ignition mechanism of small arms Lock (weapons guidance), a missile navigation system's
Lock
Firearms older than 20th century
separate ignition loaded, whose model or the patent dates back to 1890 and manufactured before 1945 2 ° using only cartridges with ignition, loaded with
Antique_firearms
Type of motorcycle
cylinder, head, and induction, and the points ignition replaced by Yamaha Capacitor Discharge Ignition) which was to form the basis of the Escort-distributed
Yamaha_RX_100
Engine in which fuel combusts with an oxidizer
used in compression ignition (CI) engines and bioethanol or ETBE (ethyl tert-butyl ether) produced from bioethanol in spark ignition (SI) engines. As early
Internal_combustion_engine
Japanese motorcycle
the versatility of Honda's intention for the bike. 1994: Updates to the ignition timing due to adoption of the pent-roof combustion chamber design, the
Honda_CB400_Super_Four
Electricity generation by nuclear fusion
Research on fusion reactors began in the 1940s. As of 2025, the National Ignition Facility (NIF) in the United States is the only laboratory to have demonstrated
Fusion_power
Type of firearm action
cartridge case as it is pushed to the rear by expanding gas created by the ignition of the propellant charge. Several blowback systems exist within this broad
Blowback_(firearms)
1996 aviation accident in the Atlantic Ocean
fuel tank. Although it could not be determined with certainty, the likely ignition source was a short circuit. Problems with the aircraft's wiring were found
TWA_Flight_800
Type of motorcycle
USA had a smaller tank with slightly different shape and only had points ignition until the introduction of the RD400 Daytona (designated "F" in the USA
Yamaha_RD400
travel, tourism, insurance
PRE IGNITION
PRE IGNITION
PRE IGNITION
PRE IGNITION
PRE IGNITION
PRE IGNITION
PRE IGNITION
PRE IGNITION
PRE IGNITION
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