Joe Merone said that the M in the R+M/2 is marine.
Ken Streeter said the the M is measured after John Lye said that the M
stood for motor.
To correct Ken and Joe, the M does stand for Motor. From the Bosch
Automotive Handbook 2nd edition:
RON: The octane number determined be the research method is called the
research octane number (RON).
MON: The octane number determined by the motor method is called the
motor octane number (MON).
The motor method differs from the research method in preheating of
the mixture, higher engine speed and variable ignition timing
adjustment, thus subjecting the test fuel to higher thermal loads.
The MON values are lower than the RON values.
I won't even mention the FON.!
Doug Mitchell
dmitchel@ismi.net
dmitchel@ford.com
|