Engine overheating
Hey all- We have a 2005 Holiday Rambler with a Cummins ISC 330. On our way to Flagstaff AZ, at 7,000 feet, we began to experience some overheating. The water temp gauge spent quite awhile in the re...
Forum Discussion
koda55 wrote:
As an over the road truck driver, when climbing mountains I always down shifted to keep my rpms high. This kept more coolant flowing and never over heated.
While I agree 100% with the "keep RPM high IF, repeat IF overheating", it also uses more fuel and for any modern turbo inter-cooled engine (Cat, Cummins, DD 4 strokes, etc), please read your manual for most economic way to climb a grade.
It is at lower RPM-- down to peak torque RPM, NOT at high RPM. Yes, if temperature starts to rise, then go to "Plan B" which will remove more heat from the engine AND more $$$ from your wallet.
We just climbed Powder River Pass (9,500'+-- climbing from 4,200'). 4th gear at 1,600 all the way-- no overheating. Others, the same day, same engine ran at 2000+ RPM all the way. Guess who uses less fuel???
If you have a Detroit two stroke, please DO keep RPM up, as they were NOT designed to run under load at lower RPM. And, I suspect these older engines were the source of "Keep RPM's UP".
