Combustion Chamber Deposit Measurement Techniques

Combustion chamber deposits (CCDs) have been quantified with a variety of methods in the past. Historically, the primary means of quantifying fuel related deposits involved either a visual rating, deposit weight, or an audible method. However, these methods can be time consuming and do not give any indication of actual location or volume of these deposits. A unique method of gaining accurate cylinder head and piston top deposit volumes has been developed and utilized for several years. Data will be shown using the deposit thickness method and its benefits compared to CCD weights, Coordinating Research Council (CRC) visual merit ratings, and an audible method.