![]() ![]() ![]() In a gasoline engine without EGR, temperatures can soar above 4800 degrees F, enough heat to melt many metals. So, the intent of EGR is to lower combustion temperatures and cool the upper cylinders. Above 2500 degrees F, the engine's combustion process produces nitrogen oxide (NOx). That is enough reason to leave these systems alone, but I have some practical concerns as well.ĮGR (exhaust gas re-circulation) is a system designed to lower the upper cylinder temperatures in an internal combustion engine. Both measures would be illegal by EPA standards and cause a truck to fail the emissions test in states like California or Nevada with visual inspection and tailpipe readings. W ranch.I've watched the EGR and DEF removal trend with curiosity. ![]()
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