Spark plugs are used in the petrol engines to ignite the air fuel mixture whereas in diesel engines the presence of spark plugs is not necessary. Technically petrol engines are called as spark ignition engines ( SI ) and diesel engines are called as compression ignition engines (CI ) .
Why do SI engines need spark plugs?
As ignition temperature of fuel used in S.I engine is high thats why it require spark plug to ignite the fuel to take power stroke. To ignite the (air+ fuel mixture) in petrol engines.
Which is not use in CI engine?
Why methanol is not used in CI engine? Explanation: Methanol is not used in CI engines because of its high octane number and low cetane number.
Is fuel injector used in CI engine?
The injection pump sends fuel under pressure to the nozzle pipes which carry fuel to the injector nozzles located in each cylinder head. … CI engines are operated unthrottled, with engine speed and power controlled by the amount of fuel injected during each cycle.
Will a diesel start without glow plugs?
9 Answers. Glow plug is merely an aid for starting the engine. There are many designs still produced today without any glow plugs (eg military diesels run without any electricity), and even many modern diesel engines can be started if glow plugs fail (unless onboard computer prevents that).
How often should you change glow plugs?
Glow plugs should last for as long as 100,000 miles; they will gradually deteriorate due to wear and tear over this period. The good news is that not only are glow plugs incredibly long-lasting, they’re also amongst the most cost-effective car parts to replace.
How much does it cost to change glow plugs?
If you want to prioritize convenience and do the job done correctly, you can pay mechanic labor costs of $90 to $200 to replace your glow plugs. Depending on the design of your engine and the mechanic’s expertise, the job can take up to two hours to complete.
What are the symptoms of bad glow plugs?
In this article, we look at six common signs that indicate glow plugs could be faulty or damaged.
- Something’s wrong: the engine warning light. …
- Hard starting. …
- Engine misfiring. …
- Rough idling. …
- Decreased fuel efficiency. …
- White smoke. …
- Black smoke.