Common Sources of Error in Knock Ratings

https://enginebuzz.com/wp-content/uploads/2020/11/Sources-of-Error-in-Knock-Ratings-5-9-1960.pdf

An investigative review by Ethyl Corp in 1960 still very relevant today

Key Insights show how much error can be attributed to different parts of the process and system(s). Think your data is sound? Read this and take another look.