OK, let's flog this one to death.... Of what I know about engines..... 1) It is a proven fact that leaner mixtures burn hotter. That is why modern engines use EGR - to COOL and DILUTE the combustion to reduce peak temperatures. This results in less formation of NOx. 2) Retarded timing will also make an engine run hotter. Just look in any old auto repair manual (like an OLD Motor's or Chilton'e). One of the listed leading causes of over heating is retarded timing followed by mixture too lean. 3) Fuel is introduced into the combustion chamber as a VAPOR, and should therefore have minimal cooling effect. 3) OCTANE! Most people do not know what octane is or what its effect is. so.... a) Octane is a comparison to what was once designated as the "ideal" motor fuel....Isooctane. b) Octane is determined by flash point and rate of burn when ignited as well as Reid vapor pressure. Lower octanes have lower flash points and faster burn. In view of this, I would say that octane most certainly DOES have an effect on run-on!
The bottom line is that you still need fuel mixture, compression, and an ignition source for an engine to run or run on. Given that the compression will be present after the engine is turned off, and that fuel mixture will also still be available, the source of ignition comes into question. Given that after the switch is turned off, the engine parts are still moving, and are still hot, I would say that my conclusions are as follows:
1) Reducing the idle setting would also reduce the likelihood of running on. 2) Higher octane fuel would also reduce running on due to the higher flash point. 3) Timing is irrelevant. 4) Reducing operating temperature should also have an effect on running on.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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