The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 4/9 Saab Owners' Convention Day Pass Raffle | 3/26 M Car Covers (by State of Nine)

The Saab Network Mailing List FAQ
Search:

Main Index
[ Prev by Date ] [ Next by Date ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Check Engine & O2 Sensor & Fuel Type
Posted by pseudo_v (more from pseudo_v) on Sun, 25 Mar 2001 21:09:38
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>The USA uses Average Octane Number (AON).  This is a simple average of RON
(Research Octane Number) and some other number.

The 'some other number' is MON:
Motor Octane Number.

   RON is calculated by chemical analysis of the sample.
It basically measures the molecular weight (to wit: carbon content) of the
sample.
   MON is calculated by using the sample in an actual engine. The engine is
a purpose built one-cyl engine with variable compression ratio.
   Back in the olden days, when I was a gradual student, my school (WPI)
did the MON testing for the state of MA.
The testing procedure is somewhat elaborate for something so simple, but
interesting. Us gradual students EARNED the $20/test.

Anyways, the MON usually comes out 4 points lower than RON, since its's
done in real-world conditions, not lab conditions.
The state mandates that the figure reported on the pump be the average of
RON and MON, and, at least here in New Hampshire, the pumps have a sticker
on them that say: 
(RON + MON)/2


>Anyway, a Trionic-controlled turbocharged SAAB should run flawlessly on
regular as well as premium, provided that the gasoline came from a quality
supplier.

  Towards the end of its life (well, in my possession), I ran my '78 Turbo
on regular (87) gas.
I would only ping if you stomped on it real hard at relatively low RPMs. At
higher RPMs I couldn't get it to ping.
But, name brand (but NOT Mobil!) US gas.

Bob Sypek
'78 99 Turbo, sold at 139K for a ...
'86 900S, 396K and still cookin'
==================
The Saab Network
http://www.saabnet.com/
saabno39sdcx6spamx782saabnet.com

Posts in this Thread:
StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

This is a moderated FAQ - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no Spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. TSN has been a moderated forum since 1988. For usage guidelines, see the TSN Mission and Purpose Page. Please remember that you are not anonymous
Your address is: 18.220.137.164 - Using Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) - Logged.
Site Members do not see red text instructions, green links, and bottom of the page banners.
Click here to see all the Site Membership Benefits!