Re: Don't forget Octane was calculated diffrently back then NTXT

Posted by David Sherman on Wednesday, April 25, 2001 at 10:56AM :

In Reply to: Don't forget Octane was calculated diffrently back then NTXT posted by Allen Patnode on Tuesday, April 24, 2001 at 5:41PM :

How have they changed? My handbook says "The octane number of any gasoline is the percentage by volume of octane in the octane/heptane mixture that just matches the gasoline in antiknock quality, as determined in the CFR engine by the standard procedure" It describes the CFR (Cooperative Fuel Research Committee) standard knock test engine with a drawing and table of dimensions (single cylinder, overhead valves, 3-1/4" bore, 4-1/2" stroke, etc), and says "Compression ratio can be varied from 3.1 to 15.1 by raising or lowering the cylinder to vary clearance volume over the piston". It goes on to say "The octane number of gasolines ranges from 40 to 87. Premium fuels are 78, average grade from 60 to 70, fighting grade aviation gasoline, 87."

Follow Ups: Re: Don't forget Octane was calculated diffrently back then NTXT - Ken in CO 10:18AM 04/26/2001 Re: Unless it's a ratio... - Tim Way 2:06PM 04/26/2001 Re: Don't forget Octane was calculated diffrently back then NTXT - Howard 4:28PM 04/25/2001 The same calculation - RDavis 8:43AM 04/27/2001 Post a Followup Name: E-Mail: Subject: Message: Optional Link URL: Title: Optional Image Link URL: This board is powered by the Mr. Fong Device from Cyberarmy.com