Monday, Jan 26, 2004 at 08:23
Peter. A petrol engine will overheat/burnvalves etc. running lean.This is because a weak mixture burns slower.
With a diesel the opposite occurs,the
fuel being introduced as a calibrated amount which rapidly self ignites. Increasing the amount of
fuel increases EGT which in turn speeds the turbo to provide intake boost. It follows that at quite low engine revs. the turbo could be making maximum boost as a result of max.
fuel injection. Dangerous EGT levels can rapidly occur at this stage, especially if even more
fuel is injected.
In the late 60's I was involved with Mack logging trucks (maxidynes) which had EGT gauges which had a "redline" of 1100deg. If this was exeeded running at full load it was a simple matter of slightly backing off, gear changes, to bring the EGT down.
EGT is not an issue with normally aspirated engines
Banks Power has a very good site on this. Use Google search.
And FWIIW! Mack trucks have for many years now been owned by Renault! I dont think the frogs are entirely to blame
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