[FWDLK] True Gasoline Octane Ratings

[Jan & Roger van Hoy <vanhilla@xxxxxxxxxxxx>]

Well, there are different octane rating methods, most common being the research octane number [RON] and the motor octane number [MON].  In the 1930's the MON was used but the RON became standard in 1947.

 

Nowadays the average is used.[RON+MON/2]  So today's 91 octane is as potent in some ways as 1950's "100 octane."

 

See http://www.faqs.org/faqs/autos/gasoline-faq/part3/preamble.html

for more detailed info.

 

--Roger van Hoy, Washougal, WA, '55 DeSoto, '58 DeSoto, '42 DeSoto, '66 Plymouth, '41 Dodge

----- Original Message -----

From: Dave Stragand

To: L-FORWARDLOOK@xxxxxxxxxxxxx

Sent: Friday, November 25, 2005 12:49 PM

Subject: [FWDLK] FW: True Gasoline Octane Ratings

Accidentally sent to the ?request? address?

 

---

From: Bill/Pat Helm [mailto:modiggers@xxxxxxxxxxx]
Sent: Friday, November 25, 2005 2:52 PM
To: L-FORWARDLOOK-request@xxxxxxxxxxxxx
Subject: True Gasoline Octane Ratings

 

Big block engines from the 50's & 60's sometimes required gasoline with octane ratings over 100.  For example, a 1964 T-Bird I once owned with a 390 called for 102 octane premium fuel.  (Yes, I wised up & now have a Mopar!)

Does anyone have REAL comparisons for our old cars to today's octane ratings?

/s/  Bill Helm

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