Dr. EVIL said: (quoted from post at 17:56:43 05/27/15) Nobody's stated a brand or model of engine, but I've seen KOHLER advertising charts for the old cast iron
flat head K-series engines that show cooling air flow is DIRECTLY PROPORTIONAL to RPM. Means at 2700 rpm
they make 75% of the cooling air flow that they would make at 3600 rpm.
If an antiquated engine like that can perform to that level, a newer more modern engine should too.
The manual says run wide open because they are not buying the gas, and they can sell more rebuild parts
when you run them that hard. And if the cheap diecast conn rods fail, they for sure window the block!
More money from parts sales!
Engine fail because they are lugging under load. While operating too hot from reduced cooling airflow. The increased heat makes detonation/knock more likely which will break connecting rods.
This post was edited by buickanddeere at 17:08:12 05/27/15.
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