There are many reasons why detonation and pre-ignition can occur in an internal combustion engine, we will discuss some of the most common here.

1. Atmospheric conditions.
Atmospheric conditions can include humidity, air density, atmospheric pressure (how much oxygen is in the air – typically associated with altitude), and most importantly temperature. Temperatures too hot or too [...]

To understand abnormal combustion, normal combustion must first be understood. Normal combustion is the complete burning of the air / fuel mixture in the combustion chamber in an even and steady manner. The flame front should begin at the spark plug roughly between 5 and 45 degrees before top dead center (TDC) and [...]

Hi and welcome to Abnormal Combustion.  We are working diligently on new articles and information.  We will be putting up alot of good information for 4 stroke engine tuning.  Our focus will be on Abnormal Combustion, like detonation, spark knock, pinging, and pre-ignition.  Stay tuned for professional advice on what to do and what not [...]