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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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