My last several columns have been on the relationship between knock and unleaded fuels in aircraft engines. I have received several questions from people who have experienced knock in their car engines, especially in the 1970s and 1980s. They note that knock didn’t harm their auto engines, so why am I worried about a little knock in an aircraft engine?
There are a number of significant differences between auto and aircraft engines. The biggest is liquid vs. air cooling. [Read more…]