There are a lot of old wives' tales about 93 octane gas... More power, runs better...
Heck, I've even heard that the higher octane replaces the lead in gasoline... It doesn't.
The compression in the old (pre '06 series) 4-cylinder IH gas engines is not high enough to require high octane gasoline.
Gasoline will ignite with enough heat and compression. This will manifest itself as a "ping" in a gasoline engine... I'm never quite sure about the whole relationship between pre-ignition, spark knock, and ping. They may be the same thing, or maybe not, but I'm pretty sure they all stem from the gasoline igniting before the spark plug fires.
What octane does is basically "stabilize" the gasoline so it doesn't ignite too soon in high-compression engines. The gas goes bang when it's supposed to go bang...
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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