K & N filter change
I purchased a 2013 GMC 3500 with a duramax diesel engine.....I filled it up, took it on a road trip down the interstate 65 miles to the next town then turned around came back and refilled it. 17.3 mp...
Forum Discussion
I'm not a huge fan of K&N filters. I do believe that most of the "dirty intake" guys have installation issues. I haven't looked at a new K&N in years, but their instructions used to require that the sealing surface be greased before installation. If you don't follow the instructions, don't blame the product.
For the people that believe that diesel engines flow "tons more air" than a similar sized gas engine, you may want to play around with an engine airflow calculator. A turbo diesel engine of 366 ci displacement and peak power at 3300 rpm will draw approximately 30% more air through the filter than a similar sized naturally aspirated gas engine with peak HP at 5400 rpm. Change that gas engine to turbo and it will draw 40% more air than the turbo diesel. Diesel vs. gas with both naturally aspirated will result in the gas engine needing more air.
For the people that believe that diesel engines flow "tons more air" than a similar sized gas engine, you may want to play around with an engine airflow calculator. A turbo diesel engine of 366 ci displacement and peak power at 3300 rpm will draw approximately 30% more air through the filter than a similar sized naturally aspirated gas engine with peak HP at 5400 rpm. Change that gas engine to turbo and it will draw 40% more air than the turbo diesel. Diesel vs. gas with both naturally aspirated will result in the gas engine needing more air.
