How Does DEF Work in a Diesel Engine?
June 19, 2024How well do you know your diesel engine? Upgrading your diesel engine can increase power and efficiency while keeping emissions in check. If you’re considering a remanufactured 6.7 Powerstroke diesel engine, it’s important to know about Diesel Exhaust Fluid (DEF) and why it’s essential. It’s time to put your diesel engine knowledge to the test!
What is DEF for diesel engines?
DEF is a liquid solution composed of 32.5% urea and 67.5% deionized water designed to reduce harmful emissions from diesel engines. This fluid is injected into the exhaust system through a process called Selective Catalytic Reduction (SCR), which helps break down nitrogen oxides (NOx) into harmless nitrogen and water.
Introduced in the mid-2000s to meet the Environmental Protection Agency’s (EPA) strict emissions standards, DEF is stored in a separate tank in your engine, marked by a blue cap, and injected as needed to keep emissions in check.
What year was DEF required in diesel engines?
Since 2010, DEF has been a standard and mandatory component for all diesel engines in the US. It is specifically required for engines equipped with the SCR system. However, not all diesel engines need DEF. For example, engines using the Exhaust Gas Recirculation (EGR) system do not require DEF, and diesel engines older than 2009 were not designed with DEF.
Additionally, in 2008, the EPA mandated particulate filters on all ¾ ton and larger trucks. In Canada, tampering with or removing the DEF system is illegal due to emissions regulations and can lead to significant fines, failed inspections, and reduced resale value.
What does DEF do for a Diesel Engine?
DEF plays a critical role in reducing air pollution and enhancing the overall performance of diesel engines. It significantly reduces NOx emissions, helping the engine meet stringent emissions standards. Running out of DEF can reduce engine power, potential engine shutdowns, and noncompliance fines. To prevent possible damage to your engine, keeping the DEF tank adequately filled is essential for maintaining engine efficiency and environmental compliance.
Benefits of DEF for Diesel Engines
- Improved Fuel Economy: Optimizes combustion and increases horsepower while reducing regen issues and engine wear.
- Reduced NOx Emissions: Essential for lowering harmful emissions produced during diesel combustion.
- Environmental Compliance: Helps diesel engines meet EPA and global emissions standards.
- Maintained Engine Efficiency: Ensures peak performance without sacrificing fuel efficiency.
- Legal Compliance: Prevents fines and legal issues by adhering to emissions regulations.
- Environmental Responsibility: Contributes to cleaner air and a lower environmental impact.
- Technological Requirement: Integral to the SCR system used in modern diesel engines.
Did you know that our Speed of Air Hyperperformance Pistons can reduce your engine’s regen cycles and DEF consumption? Request a quote to learn more about a Speed of Air upgrade for your 6.7 Powerstroke engine!
How Much DEF Does a 6.7 Powerstroke Engine Use?
For a 6.7 reman Powerstroke engine, DEF usage typically follows a rule of thumb: 1 gallon of DEF for every 200 gallons of diesel fuel. Here are some general guidelines:
- Average Consumption Rate: DEF is used at a rate of about 2-3% of diesel fuel consumption.
- DEF Tank Size: Typically holds about 5-6 gallons.
- Refill Frequency: Under normal driving conditions, you should refill the DEF every 5,000-7,000 miles.
Never let your DEF tank run completely dry to ensure optimal performance and compliance. Monitor levels regularly and top up as needed.
Why do Diesel Engines need DEF?
- Improved Fuel Economy: Optimizes combustion and increases horsepower while reducing regen issues and engine wear.
- Reduced NOx Emissions: Essential for lowering harmful emissions produced during diesel combustion.
- Environmental Compliance: Helps diesel engines meet EPA and global emissions standards.
- Maintained Engine Efficiency: Ensures peak performance without sacrificing fuel efficiency.
- Legal Compliance: Prevents fines and legal issues by adhering to emissions regulations.
- Environmental Responsibility: Contributes to cleaner air and a lower environmental impact.
- Technological Requirement: Integral to the SCR system used in modern diesel engines.
How Often Do You Put DEF in a Diesel Truck?
The frequency of refilling DEF varies between 4,000 to 10,000 km, depending on vehicle use and load. Newer diesel trucks and heavy-duty vehicles have a warning system that alerts you when DEF levels are low, similar to a fuel gauge. It is advisable to monitor these levels regularly and refill before the DEF tank runs dry to avoid engine issues.
If you’re considering an upgrade or need parts for your 6.7 Powerstroke engine, look no further than DFC Diesel. Our expert team can help you find the perfect remanufactured diesel engine or component to boost your vehicle’s performance and efficiency.
Request a quote today or explore our Powerstroke products to find the ideal solution for your 6.7 Powerstroke. Experience the difference with DFC Diesel and take your vehicle to the next level.