Posted by NCWayne on September 27, 2013 at 20:34:41 from (98.21.228.82):
In Reply to: Gas-additive question posted by Kirk Affeldt on September 27, 2013 at 18:33:37:
Given the repleis so far, most have hit the nail on the head. For an older engine, with relatively low compression, using high octane gas is a waste. You can check out the link below to tell you everything you ever wanted to know about octane numbers, how they are figured, etc, but ultimately it comes down to one thing. The higher the octane number, the more resistant to detonation the fuel is. This being the case, engines with higher compressions need the higher octane fuel so it has the ability to resist premature detonation (basically resist compression ignition)and not actually ignite until hit with the spark from the plug. Too, high speed engines can benefit from higher octane fuel so the fuel/air mix doesn't ignite until hit by the 'hottest' part of the spark. Since the spark sets the timing, the closer you can get the fuel to detonate to the optimal part of the pistons stroke, the better off you are. So,using a fuel that has the ability to resist detonation until that time is what you need to do so.
In either case the idea is for the fuel not to ignite until the optimal time in the compression cycle. At several thousand RPM the net result of the fuel igniting early, or late for that matter, is a knock in the engine and a reduction of performance.
In the end high octane gas is great for high compression engines, high speed engines (ie-small 2 stroke engines, etc) but there really is need to, or benefit of, using it in an old, 'slow' turning, low compression engine.
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