Here I was explaining to a friend the need to use hotter or colder plugs when operating snowmobiles in colder or hotter weather. I then realised that the same applies to our tractors.
For those of you whom arent familiar with the Hot/cold spark plug thing heres a quick explanation:
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.
It is important to remember that spark plugs do not create heat , they can only remove heat. The spark plug works as a heat exchanger by transferring the heat to the engine's cooling system(liquid, fan or free air). The heat range is defined as a plug's ability to dissipate heat.
Whether the spark plugs are fitted in a lawnmower, boat, or a race car, the spark plug tip temperature must remain between 932F and 1562F (500C-850C). If the tip temperature is lower than 500°C, the insulator area surrounding the center electrode will not be hot enough to burn off carbon and combustion chamber deposits. These accumulated deposits can result in spark plug fouling leading to misfire. If the tip temperature is higher than 1562F the spark plug will overheat which may cause the ceramic around the center electrode to blister and the electrodes to melt. This may lead to pre-ignition/detonation and engine damage.
Heres a little image to help understand
Now that we all know what im talking about, my question is:
Does any of you guys change your plugs in the winter or do you all keep the same plugs all year 'round?
Edited by hatedge, March 15, 2014 - 08:30 AM.