What is the difference between NGK R5E and NGK R6E?

**criz360** · September 3rd, 2012 11:16 PM

I've tried to replace my spark plugs with NGK R6E and after a few minutes the engine dies and won't restart. The next day, I tried to start and the engine turned again. So I reinstalled my NGK R5E and test drive with no problem.

Does spark plugs really have the factors? My engine is 1.6L.

**sirkosero** · September 4th, 2012 10:19 AM

heat range. mas malamig ang heat range ng r6e

**oj88** · September 4th, 2012 11:55 AM

^ Correct.

You used a slightly colder plug. Colder plugs are typically used on hotter-burning engines (ie. operating at high-RPM and high-load conditions) while it's vice versa for the hotter plug. If you install a colder plug on an engine that does not generate enough heat in the combustion chamber, the plug may foul up, causing hard starting. On the other hand. a hotter plug will cause the electrodes to burn or melt (in extreme cases) and life expectancy of the plug is significantly reduced. Using the correct heat range for your engine will cause the sparkplugs to burn off any fuel-oil accumulation on the electrodes to prevent fouling, but still not hot enough to self-destruct.

Check you sparkplugs after some time and compare it to this illustration: