924Board.org

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

It says to use 92 octanes for my car from manufacturer recommendations.
Since 87 and 89 octane has a quicker burn time, would this not adversely affect timing and possible long term damage?
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work.

924 turbo · Posted: Mon Jun 16, 2003 9:51 am Post subject:

Check this link:

http://www.type2.com/bartnik/octane.htm

Excerpt: Volkswagen recommended 91 RON octane gasoline for use with their air-cooled engines. However, here is where the confusion sets in: The RON method of octane measurement is not used in the United States. In the US, a different method entirely is used, called the CLC method. The number that results from this method is the average of the RON octane number and the MON octane number, so (RON + MON)/2 = CLC octane number. This is the number that you will find printed on a yellow label on gas pumps in the United States.

91 RON octane is equivalent to 87 CLC octane. My source for this claim is the Volkswagen owner's manual for both the 1978 Bus, the 1974 Karmann Ghia, and the 1981 Vanagon.
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Jon Furst

Paul · Posted: Mon Jun 16, 2003 10:59 am Post subject:

I believe a thorough check of our owners manuals will verify that all stock 1976 to 1982 US 924s and 931s were made to run on 87 octane.

87 924S: 91 Octane (from my owners manual)
88 924S: 92 Octane (not sure of this one).

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

924 turbo ,
You just saved me a whole lot of money over the year.
Nice post
Thankyou.
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work.

cathy · Posted: Mon Jun 16, 2003 12:43 pm Post subject:

Thanks for clearing up that RON deal. But I always put 94 octane in (Sunoco), and if there were Chevron stations in my area, I would be using that as well (I use their Techron products).

Because once upon a time (two summers ago), I got a BAD tank of gas. I am paranoid and can't afford a new in-tank fuel pump.

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"You measure democracy by the freedom it gives it's dissidents, not the freedom it gives it's assimilated conformists." - Abbie Hoffman

PROUD OWNER OF A 1982 924

blury · Joined: 14 Jun 2003 Posts: 137 Location: Oklahoma

I have a U.S. manual i guess for my 924S and it says 87 octane. Thats what i have always used with no problems.

924RACR · Posted: Mon Jun 16, 2003 10:23 pm Post subject:

Yes, 87 is quite sufficient. I use 89 in the racecar exclusively.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Daver · Joined: 06 Jun 2003 Posts: 3 Location: PHX AZ USA

Er. Hmm. The manual for my 1988 924S says 95RON or 90 in the US. Everything around here is 87 89 91 so being the penny pinching bastard I am, I have been filling the tank half 91 and half 89. Is it possible that I could use a lower octane? I was thinking about experimenting once summer ends, as screwing around with the octane rating at 110 degrees outside seems like a poor idea.
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1988 924S