How to Screw up Diesel Combustion

In this clip taken from Killing A Duramax, Ep 14, Gale Banks explains why swirl is so important to Diesel combustion. While ported heads and valve reliefs may increase airflow, they may diminish swirl leading to an incomplete burn and soot output. This educational video is a product of Gale’s quest to develop a new high-speed camshaft for the Duramax L5P. In the full-length video, he reveals why squish and swirl are so important to proper diesel combustion, as well as valve timing, duration, and overlap. He also details why he’s chosen a stock piston over ones with valve reliefs. This is the most information you’ll receive about Diesel combustion outside of engineering school.