dieselweasel wrote:Hi all, I've spent tonight searching and reading a few threads here and couldn't find an answer to a question that a friend asked me today, he said he knew that the cylinder temps are higher with a blocked
egr but how much hotter? I had no idea so I thought I'd ask, he's pro
egr which is his choice but seems to think I'm doing more harm than good in the long run. Any info appreciated
From my understanding: with the
egr, the cylinder temps are lower due to the exhaust gases from the
egr having less oxygen so the combustion temps reduce. The exhaust temps increase, this is a diesel paradox but has been confirmed by pyrometers in the the exhaust measuring the temps by others. Blank or disable the
egr and the air fuel mix has more oxygen so the combustion temps increase and produce more NO2. this is the reason behind having the
egr to meet emission standards, but the exhaust temps reduce. Having the
egr introduces inefficiency in the combustion process to reduce production and emission of NO2. The thermostat in my ML opens at 76 degrees C, the coolant temp usually hovers at around 80 to 82 degrees. Uphills i get readings of 84-5. This reflects the controlled engine operating temperatures well within safe operating limits. The pyrometer readings of exhaust temperatures reprorted by others on this forum also reflect safe operating levels, below melting point of Aluminium ect...hope this helps. I would also like to see if others agree on the diesel paradox mentioned above or has consensus on this altered..