Originally Posted by Diesel911

I was also told that it was Detroit Diesels that in Winter Weather can get too cold while idling because when the Exhaust Valves (the only valves it has) are open the Blower is blowing a large volume of Air through the Cylinder Ports and out of the Valves. That volume of Air is a larger volume than a Cylinder full of Cold Air that a 4 Cycle engine would. Any way the effect is that at idle the cold Air during Winter cold can sometimes over cool the Cylinders.