by Roderunner » Mon Sep 19, 2016 7:25 pm
EGR may help with lowering combustion temps, but why pour abrasive carbon into the intake and mostly no, 3 cylinder? Over time, the carbon builds up inside the inlet manifold and port, restricting airflow which causes the cylinder/s to run hot, and the carbon causes accelerated wear in cylinder no,3 .
An EGT gauge fitted before the turbo is a great way to see whats happening heat wise inside the engine, mine tells me when the air cleaner is due for replacement by indicating an extra 40*C at cruise, but that's not all that it shows, when the fuel filter gets too restrictive the injection pump starts to starve for fuel and EGT's skyrocket because the pump can't advance the injection timing correctly because it uses internal pump pressure to change the injection advance. I've seen the exhaust temp go from 550*C to around 800*C when the pump isn't working correctly, if I didn't have the gauge I wouldn't have known.