answersLogoWhite
BMW Motorcycles
Cagiva Motorcycles
Choppers and Custom Motorcycles

What is Spark plug heat range?


Top Answer
User Avatar
Wiki User
Answered 2008-11-11 15:32:41

Spark plugs are designed so that they transfer heat from the combustion chamber to the head where they are mounted. If they stay too cool you will get high emissions, poor fuel economy, and generally poor performance. If they get too hot they could ignite the fuel mixture without a spark, but more of a concern is that they could overheat the piston and possibly melt a hole in it. Plugs of similar design are manufactured with different amounts of insulation around the center electrode to control heat range. Engine manufactures will sometimes recommend different heat range plugs for different applications. Engines under heavy load and/or operated in high temperature environments will use a "cooler" plug then those that are not constantly stressed. You should use the manufacture recommended plug heat range unless you are doing something the manufacturer never anticipated.

234
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
๐Ÿ˜‚
0
User Avatar

Your Answer

Still Have Questions?

Related Questions

What is the spark plug gap on a 1984 Honda v65 Sabre?

1984 v65 sabre plug gap and NGK Spark PLug and heat range


What is the correct spark plug set up for a 2001 Chevy Malibu Which wire goes to which spark plug from the spark plug to the distibutor cap A diagram would be helpful?

only use AC Delco plugs, there the only one with the correct heat range.


Can you use an RJ19-lm spark plug instead of a J19-lm spark plug?

Yes you can. The "R" simply refers to the plug being a resistor plug. The size, diameter, heat range and thread pitch are exactly the same.


Are all spark plugs the same?

No There are many types of spark plug. They differ in size, heat range and amount of electrodes fitted. To avoid damage to an engine always use the recommended spark plug for that engine. The wrong plug will cause massive engine damage at times.


Normal value of voltage in spark plug and distributor function?

spark plug produces spark in the range of 15000-35000 volts.


Why did the spark plug electrod melt off?

Too long since last change Wrong heat range for use


Can you use a Lawn Mower spark plug on my car?

NO, lawn mower spark plugs and a car's spark plug are different lengths, heat range and gap. Even if it fits the threads for the hole you run a high risk of causing major damage to the engine.


What causes knocking after changing the spark plugs?

Possible wrong heat range of plug. Make sure you have the right plugs for the vehicle.


What is heat range?

The term spark plug heat range refers to the speed with which the plug can transfer heat from the combustion chamber to the engine head. Whether the plug is to be installed in a boat, lawnmower or racecar, it has been found the optimum combustion chamber temperature for gasoline engines is between 500°C-850°C. When it is within that range it is cool enough to avoid pre-ignition and plug tip overheating (which can cause engine damage), while still hot enough to burn off combustion deposits which cause fouling.The spark plug can help maintain the optimum combustion chamber temperature. The primary method used to do this is by altering the internal length of the core nose, in addition, the alloy compositions in the electrodes can be changed. This means you may not be able to visually tell a difference between heat ranges. When a spark plug is referred to as a "cold plug", it is one that transfers heat rapidly from the firing tip into the engine head, which keeps the firing tip cooler. A "hot plug" has a much slower rate of heat transfer, which keeps the firing tip hotter.An unaltered engine will run within the optimum operating range straight from the manufacturer, but if you make modifications such as a turbo, supercharger, increase compression, timing changes, use of alternate racing fuels, or sustained use of nitrous oxide, these can alter the plug tip temperature and may necessitate a colder plug. A rule of thumb is, one heat range colder per modification or one heat range colder for every 75-100hp you increase. In identical spark plug types, the difference from one full heat range to the next is the ability to remove 70°C to 100°C from the combustion chamber.The heat range numbers used by spark plug manufacturers are not universal, by that we mean, a 10 heat range in Champion is not the same as a 10 heat range in NGK. Some manufacturers numbering systems are opposite the other, for domestic manufacturers(Champion, Autolite), the higher the number, the hotter the plug. For NGK, the higher the number, the colder the plug.Do not make spark plug changes at the same time as another engine modification such as injection, carburetion or timing changes as in the event of poor results, it can lead to misleading and inaccurate conclusions (an exception would be when the alternate plugs came as part of a single pre-calibrated upgrade kit). When making spark plug heat range changes, it is better to err on the side of too cold a plug. The worst thing that can happen from too cold a plug is a fouled spark plug, too hot a spark plug can cause severe engine damage


What causes a 1982 Honda Silverwing 650 to keep burning out spark plugs?

Wrong heat range plug for the fuel and/ or riding conditions


How do you keep your spark plugs from fouling up?

Correct tuning, correct heat range plug, correct oil/gas ratio for the motor


Will gapping a spark plug higher than called for make it a hotter plug?

Spark Plug "Heat Range" versus the "gap"NO, varying the gap of a spark plug has absolutely nothing to do with the "heat range" which the plug will operate safely. The heat range does NOT refer to the temperature of the plug's spark.Engine heat can damage spark plugs and therefore the same "size" plug can be manufactured to operate at different engine operating temperature ranges as necessary.This difference in ability to withstand different temperature ranges is accomplished by varying the materials from which the plug is manufactured, and the thickness and/or lengths of the components in the plug. This adapts the various plugs for different engine temperature operating conditions.As for the gap, for optimum engine operation and fuel effeciency, the plug MUST be gapped precisely per the vehicle engine manufacturer's specifications.The optimal gap setting has been carefully engineered by the manufacturers, and to violate the specification only reduces the efficient operation of the engine, and can result in damage to various engine components, AND totally destroy any chance of "good" gas mileage.


What is spark plug gap for 1969 Ford mustang 302?

The spark plug gap range for the non-Boss 302 is 0.032"-0.036".


Are iridium spark plugs good for standard or non turbo cars?

Yes as long the grades such as heat range are recommended by plug or vehicle manufacturer.


What is the difference between ngk-dpr7ea-9 and ngk-dpr9ea-9 spark plug?

heat range. 7 is a "hotter" plug. That means it transfers more heat to the cylinder head during operation.


What is the temperature difference between the Autolite sparkplug 26 and 25?

Temperature difference or "heat range" is that a "hot" spark plug has a long insulator with more surface area exposed in the combustion chamber. This spark plug will stay hotter, helping to burn off residue and deposits. A "cold" spark plug has very little exposure of its ceramic insulator to the combustion chamber. This spark plug will run cooler, however the 25 and 26 are not heat ranges or temperature indicators. You can read more in the related link.


Can you put plug an plug wires off Chevy 350 carbarated motor on a 97 Chevy 350 vortec fuel injected motor?

No. the plug wires are made different and the spark plugs ae NOT the correct heat range.


What is the spark plug torque setting on a 1993 Ford Tempo?

The spark plug torque spec range is between 6 and 10 ft/lbs.


Matching spark plug for nanda a7c?

The spark plug match for an NGK plug is a C7HSA you could up the heat rating by using a C8HSA if you are haveing starting problems


What is the best spark plug to use for a 86 Chevy engine?

The original A/C Delco plugs are hard to beat. Just get the right heat range for your application.


What heat range in an NGK plug is required for a 1979 Yamaha XS750 Special?

The temperature of the spark plug's firing end must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. This is called "Thermal Performance", and is determined by the heat range selected. The heat range has nothing to do with the amount of voltage going through the plug. Also plugs remove heat from the combustion chamber not add it.1977-83 Yamahas used the NGK B-8ES or BP7ES gapped at about 0.6 - 0.7 millimetres or 0.024 - 0.028 inches .So your heat range equals a 7 or 8 eaqual a "colder" or cooler plug.A cold spark plug has a shorter insulator nose and absorbs more combustion chamber heat. This heat travels a shorter distance, and allows the plug to operate at a lower internal temperature. A colder heat range is necessary when the engine is modified for performance, subjected to heavy loads, or is run at a high rpm for a significant period of time. Colder spark plugs remove heat quicker, reducing the chance of pre-ignition/detonation.


What is the difference between an J19LM and J17LM plug?

The 17 is a colder plug with a heat range of 7. The 19 is hotter with heat range of 9. The higher heat range is preferable for colder climates. While the 17 is for warmer areas.


What is the difference between a b8hs and a br8hs spark plug?

the br is a resistor type plug the b is regular same heat range and everything should use br whenever possible and a must for electronic ignition


Would a different heat range plug help your hemi run better?

Yes, a different heat range plug will definitely help your hemi run better.


What engine uses CR43TS spark plug?

All 350 chevvvvies and some 4.3 V6.... 305 too... CR-copper resistor; 43-heat range


Still have questions?