Posted by John T on April 01, 2011 at 10:23:14 from (173.243.189.183):
In Reply to: 87 octane posted by Jerry Gilliam on April 01, 2011 at 08:28:12:
Im an electrical engineer NOT a chemist or fuel person but as I understand it higher octane is purposely made harder to ignite so as to avoid pre ignition spark knocking in higher compression engines. I dont think you should use any higher then necessary octane to prevent pre ignition and if you go higher theres more chance of carbon and unspent fuel left over versus if you run lower octane thats easier to ignite and may result in a more complete burn.
In these old relatively low compression relatively low RPM tractor engines I SEE NO REASON TO RUN HIGH OCTANE FUEL as pre ignition spark knock IS NOT A PROBLEM so why use harder to ignite high octane fuel and perhaps end up with a less complete burn and left over nasties????????
Ya know what makes me angryyyyyy When I was a kid I remember big oil tellin all us bumpkins they had to raise gas prices due to the cost of ADDING extra lead (LEADED FUEL) to reduce pre ignition like Gulf No Knox etc..........BUT THEN years later they had to raise the price to REMOVE that nasty harmful lead???????? So which is it, did they ADD it (raised cost) or do they have to REMOVE it (raised cost)????
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