Spark plugs and glow plugs why spark plugs are not used in diesel engines

Spark Plugs and Glow Plugs 

Change a spark plug

The differences between a spark plug and a Glow plug. Why do we need a spark plug our a glow plug in our engines?

Sometimes it is just important to know these things.

A spark plug will deliver electric current from an ignition system to the combustion chamber of an Internal combustion spark-ignition engine to ignite the compressed fuel/air mixture by virtue of  an electric spark, while containing combustion pressure within the engine.

WOW, That is a mouthful.....

But Hey,

A spark plug has a metal threaded shell, electrically isolated from a central electrode by a ceramic insulator. The central electrode, which can contain a resistor, is connected by way of  an insulated wire that connects to the output terminal of an ignition coil or magneto.

The next bit is much easier,

The spark plug is screwed into the engine's cylinder head and thus electrically grounded. The central electrode protrudes through the porcelain insulator into the combustion chamber, forming one or more spark gaps between the inner end of the central electrode. 

So as i mention in the video the spark plug combusts at the ignition cycle in a petrol engine,

Fitting a spark plug at cape town auto spares

But what does a Glow Plug do?

A glow plug (alternatively spelled as glow plug or glow-plug) is a heating device used to aid when cold starting diesel engines. In cold weather, diesel engines can be difficult to start because the combustion chambers work on high pressure heat and the mass of the cylinder block and cylinder head absorb the heat of compression, preventing ignition.

YES, without the glow plug you are going to be trying to start that engine forever and will probably be late for work.

Pre-chambered engines use small glow plugs inside the pre-chambers. Direct-injected engines have these glow plugs in the combustion chamber.

So what does it look like?

Glow Plug

The glow plug is a pencil-shaped piece of metal with a heating element at the tip. This heating element, when electrified, heats due to its electrical resistance and begins to emit light in the visible spectrum, thus the terminology glow plug. The visual effect is similar to the heating element in a toaster. 

So there you have it, while your diesel engine would probably run without the glow plug you probably want it there., but that said your petrol engine will not run without the spark plug so make sure you service at regular intervals.

So, remember without a battery the car wont run, that being the petrol engine version so go and take a look at our new range of Ktec Batteries in store now with a 24 month warranty 'Delivered to your door" Just like everything else. 

Ktec batteries

Don't forget to watch the video below. 

#Capetownspares

#RobGillT