That what they taught us, back before Chevy V8's were born.
That high octane burns slower to allow the flame front to progress over the piston area in a controlled fashion, if too fast of a burn occurs and/or multiple flame fronts are produced, a knock occurs when they collide.
A lot of owner’s manuals state just what you posted, no need to purchase higher octane than you need.
As a side note, I think with today’s economy and most folks buying regular,
it is likely that premium has been in their tanks a lot longer than regular.
When you start pushing 10- 10.5 to 1 compression, premium becomes necessary, not the low compression engines we use in our cubs.
|