What is Firing Order of 4 and 6 Cylinder Engine?


“Fire” this word always gives goosebumps to an automobile enthusiast as for him the word fire resembles with the power, of course it is true, fire is the most important source of energy from the birth of the mother earth. In an engine as we know fire which is produced by the spark plug is the main source of energy that converts chemical energy into mechanical energy, this is the basic principle over which an engine works,  now let’s race the horses of our mind and think How does the combustion occurs in engine with more than one cylinder? How does the firing of fuel (combustion) be controlled in multi-cylinder engine? Let’s just dig it out.

Firing order of a multi cylinder engine is the power delivering sequence of each cylinder which is set by the designer such that the combustion of fuel in different cylinders occurs in a predefined order that can produce uninterrupted and  maximum power output through the crankshaft  of an multi-cylinder engine.

The firing order is different for different engine configurations for example – Firing order of 2-cylinder V-shape engine is different from the firing order of the 4-cylinder inline engine.

Why Do We Need Firing Order?

As we all know a 4-stroke engine which we are using today works on an Otto cycle or a diesel cycle in which a cycle that includes suction, compression, power and exhaust is completed in 4 strokes or 4 movements of the reciprocating piston and when it comes to the engine having more than 1 cylinder the process becomes quite complex, so a pre-defined sequence of combustion or firing of fuel is required as-

  • When it comes to more than 1-pistons the load over the crankshaft increases as all the pistons are connected to the single crank shaft and if the proper firing order is not provided to the engine than there will be the chances of the crankshaft failure.
  • The proper firing order of the engine provides maximum power, smooth running and high life to the engine and also prevents the engine from unwanted vibrations.
  • Out of the all 4-strokes (suction, compression, power and exhaust) required to complete an engine’s cycle, power stroke is the strongest and generates various stresses (mechanical or thermal both) that can cause engine failure like knocking, so it is essential for a multi-cylinder engine that the power strokes in any 2 adjacent cylinders must not occur at the same time due to which an engine must have a pre-defined and proper firing order.
  • The improper firing order can affect the engine and crankshaft balancing due to the generation of uncontrolled stresses due to which harsh running, unwanted sound and unwanted vibration can be obtained from the engine which can suddenly break any component of the engine and is quite dangerous for the operator or the people nearby.
  • Improper firing order of an engine directly affects the fuel economy of the engine due to the improper combustion caused by the improper firing order.
  • Operator faces engine starting problem because of the disturbed spark timing caused by the improper firing order of an engine.

Also Read:

What is Stirling Engine – Types, Mian Parts, Working and Application?

How Power Steering System Works? – Best Explanation

How Free Piston Engine Works?

Firing Order of Different Multi Cylinder (2, 4, 6) Engines.

Firing order of 4 cylinder engine


For the proper understanding of the firing order of an engine lets us take few examples of the different multi-cylinder engine used in today’s automobile cars.

(i) In-Line 2 cylinder engine of a Tata Nano – In Tata Nano,  2-cylinder in-line engine is used even being the more than 1-cylinder engine, firing order  is not so complex as it is quite obvious that when cylinder 1 will get firing or the spark plug ignition than the cylinder 2 will be at compression stroke and the order of the firing will be 1-2.

(ii) In-Line 4 cylinder engine of a Maruti Suzuki Swift In cars like swift having 4-cylinders placed in a straight line, the firing order is configured as 1-3-4-2 which means all the cylinders will have firing or the spark plug ignition according to the 1-3-4-2 sequence, it is found that in a 4 cylinder engine a complete firing order gives 720 degrees of the crankshaft rotation which means each power stroke by the individual piston gives 180 degree of rotation to the crankshaft.

  • All the 4 cylinders in In-line 4 cylinder engine are mounted over four pins of the crankshaft placed in every 180 degree of the crankshaft.
  • For the smooth working of a 4-cylinder engine it is required that each cylinder will have different stroke at any instant  for example-

At any instant in a inline 4-cylinder engine usually it is seen that when cylinder 1 is having power stroke than cylinder 4 is usually seen to be suction stroke, cylinder 2 and cylinder 3 are usually seen to be at exhaust and compression stroke respectively.

(iii) V-Shape 2 cylinder engine of a Harley Davidson Iron 833 bike- In Harley Davidson Iron 833, 2-cylinder engine placed in V-shape is used in which same firing order as in-line 2-cylinder engine mentioned above is used i.e. 1-2.

(iv) V-Shape 6 cylinder engine of Honda Accord- In the high end cars line Honda Accord and Audi A-8, high power engine having multiple cylinders are used as in Honda Accord,  6 cylinder engine placed in V-shape  is used in which a proper and effective firing order is required.

  • The firing order in Honda Accord ( 6-cylinders placed in V-shape such that cylinder 1,2,3 are placed in left hand side and 4,5,6,are placed in right)  is configured as 1-5-3-6-2-4,
  • Firing order 1-5-3-6-2-4 means the crank pins having piston mounted are arranged in every 60 degree of the crankshaft.
  • As the power impulse is generated in every 720 degree rotation of the crankshaft which means that power stroke in V6 engine is obtained in every 120 degree rotation of the crankshaft.

(v) Flat-six cylinder engine used in Porsche 911 GT3-  In some cars like Porsche 911 GT3 6- cylinders placed  in horizontal plane having opposite direction i.e. cylinder 1,2,3 are placed in left side and cylinder 4,5,6 are arranged in right side, Are used.

  • same as the V6 engine all the pistons are mounted over 6 crank pins placed in every 60 degree of the crankshaft.
  • The firing order of this type of engine is configured as 1-4-5-2-3-6 which means that the firing or spark ignition will occur at every 120 degree of the crankshaft rotation.

The firing order of 2, 3, 4 and 6 cylinder in tabular form are given below:


Number of cylinder

Firing Order


2 1-2





3. 4


















From the above mentioned examples it is quite clear that how a firing order is arranged in different cars having different engine configuration. But the purpose of all the firing order used in different engine is same that is smooth engine operation,  with less vibration and high power output.

To know more about firing order of all multi cylinder engines visit: 


Pankaj Mishra

Pankaj Mishra is a blogger by passion and Mechanical Engineer by profession. He has completed his B.Tech degree in mechanical engineering in the year 2015. He loves to share his knowledge and help others.

One thought on “What is Firing Order of 4 and 6 Cylinder Engine?

  • January 16, 2020 at 6:35 pm

    Cyberthieves still rely on human foot defense force

    Within minutes of casting their electronic bait they caught what they would look for: A small Michigan company where an employee unwittingly clicked on an official looking e mail that secretly gave cyberthieves the keys to the firm checking account.

    Before company operatives knew what was happening, Experi stainlesss steel Inc, A suburban Detroit formation company, Was chipped.

    In september, their Catholic Diocese in Des Moines, Iowa, Lost which involves $680,000 done two days. Officials there aren sure how hackers got within their accounts, But took all they could before the bank noticed what was going on, to be able to Jason Kurth, Diocese vice chancellor.

    The diocese and the Detroit company were among dozens of people, Businesses and cities around the country victimized by one of the largest cybertheft rings the FBI has uncovered.

    In september, The bureau and its alternatives in Ukraine, holland and Britain took down the ring they first got wind of in May 2009 when a financial services firm tipped the bureau Omaha, Neb, Office to suspicious sales. since that time, The FBI Operation Trident Breach has found losses of $14 million and counting.

    Overall during the last two years, The FBI has opened 390 cases against schemes that prey on businesses that process payments electronically through the Automated Clearinghouse, Which works with 3,000 matters every five seconds. in such cases, Bureau agents have open attempted thefts totaling $220 million and actual losses of $70 million.

    But the court public records of Operation Trident Breach reveal a surprise: those high tech tools and tactics employed in these computer crimes, Platoons of low level human foot soldiers, often known mules, Are the key cogs in the cybercriminals money machine.

    A dozen FBI criminal complaints filed in New York provide an inside look at how this cybertheft ring worked:

    doing work from Eastern Europe and other overseas locations, The thieves used vicious software, called malware, To infect the computers of unsuspecting users in the usa by e mail. The malware infected e mails were written to be they came from a company manager or colleague who might send an e mail message to everyone in a company, Such as the head of human resources.

    When the e mail recipient clicked on an embedded link to a website or opened an attachment, A Trojan horse virus called Zeus applied itself and gathered usernames, Passwords and financial account numbers typed by the victims them selves computers. The hackers then used this information to move the victims money electronically into bank accounts set up inside the by the money mules.

    The money mules set up shell bank accounts to receive the money. Then they withdrew the funds from the shell accounts in amounts they thought were small enough to elude detection by banks and police officers. at times, The cyberthieves bombarded telephone numbers attached to the targeted accounts with calls to block the company from calling to verify the transactions.

    The mules sent most of the stolen funds overseas in an electronic format to accounts controlled by the ring leaders; The mules usually kept 8 to 10 percent as their cut.

    as, The FBI said money owned by one TD Ameritrade customer landed in the bank account of a fake company, The Venetian Development making Service Corp, Which was disclosed at an unmarked, Two story brick starting out in Brooklyn. The sole name on the construction company account [url=https://moldovawomen.home.blog/2019/06/12/come-closer-to-moldova-women-online-dating-guidelines/]moldova dating[/url] was that of one of the money mules. Eventually the majority of the money wound up in accounts in Singapore and Cyprus and some walked out the bank door in the pockets of mules. TD Ameritrade spokeswoman Kim Hillyer said the corporate has reimbursed customers who lost money

    comparable to in the illegal drug trade, The ring leaders abroad reaped the big profits but relied on the mules to do the risky, grimey work.

    per each shell account, A mule had to enter a bank, In full view of surveillance cameras and leave copies of personal id documents. The [url=https://sites.google.com/view/moldovawomen/more-about-moldova-women]moldova dating sites[/url] ring leaders hid behind computer screens international. On education visas.

    Among the accusations in the FBI criminal complaints:

    One mule was an immigrant from Moldova who within a few months of her arrival in New York this year had opened at least six bank accounts using a trio of names. an additional mule, A Russian countrywide, Opened eight accounts at three specific banks using five different aliases.

    The criminal networks used so many money mules that full time interviewers were needed. visas.

    A pair of Russian roommates currently in Brooklyn worked together. The other roommate opened accounts with fake names and false passports in New York and nj this summer.

    This cybertheft ring zeroed in on individuals and small and medium sized businesses because they most often have fewer computer security safeguards than huge companies. Among its goals: cities in Massachusetts and New Jersey, The account held by a hospital at a california bank and the computers of at least 30 customers of E Trade Financial Corp.

    Like any number of victims, Experi Metal has sued its bank rather than the thefts.

    a legal practitioner for Experi Metal, rich Tomlinson, Said the thieves emptied the company account and then tried to siphon another $5 million out through an empty checking account of an Experi Metal employee. these people transferred another $1.34 million before the bank shut down the mystery wire transfers, Tomlinson described.

    According to court records, the corporation bank, houston based Comerica Inc, Has recovered all but vehicle original balance of $560,000. Tomlinson said the bank should be liable for the organization losses because the wire transfers were obviously dubious the actual hadn made any transfers in more than two years and never to Eastern Europe.

    Was caused solely by what of that (Experi material Inc.) worker, A lawyer for the bank wrote in a court filing. Criminal that accessed Experi Metal accounts could do so only because Experi Metal gave him its key.


Leave a Reply

Your email address will not be published. Required fields are marked *


Enjoy this blog? Please spread the word :)