Quote:
Originally Posted by savatreatabvr
I've heard changing to a hotter plug doesn't do anything either except make your engine run hotter? I've seen people flip their factory air cleaner lid upside down to increase air flow which would increase performance right, also never worked for me!
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Flipping the lid or using an open element housing doesn't net much on it's own. In most cases the air filter system is engineered to meet the stock engine's airflow requirements. If you do things to other parts of the engine to allow it to use more air, then you would need to change the filtration system to accommodate.
Hot/cold plugs refer to the center electrode's ability to dissipate heat, changing to a hotter or colder plug is usually done to control preignition. Often in an older engine a hotter plug is used to keep clean and free of oil deposits that can retain heat and cause preignition. The tip being too hot itself will result in problems with preignition. Colder plugs are often used in high compression and forced induction engines where having the tip disipate heat faster reduces the possibility of preignition. Too cold and the tip won't be able to burn off deposits (which also cause preignition).