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better mileage with higher octane? - Page 22

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Posted by clare at snyder.on.ca on January 8, 2007, 6:43 pm

On Sun, 7 Jan 2007 22:29:02 -0500, "Solar Flare"

An Olds Rocket is an Olds Rocket - not a Chevy
The 350 OLDS engine came to the Cutlass in 1969. This was the 4.057"
bore rocket, not the 4.00 inch bore Chevy and was used AT LEAST until
1985.1986 to 90 did not have a 350 engine available.The Chevy 350 was
used in 1992 and up In Canada the 350 was not available (except the
Deisel) from 1981 to 1985 and in 1979 the"L" code 350 was a Chevy
while the "R" code was an Olds. This is from the information I have
available (which covers USA and Canada.) In Metric speak, the olds was
a 103mm bore, and the Chevy a 96.5
In 1979, the 103mm 350 was 7.9:1, and the 96.5 was 8.5:1

Posted via a free Usenet account from http://www.teranews.com

Posted by Steve on January 8, 2007, 7:39 pm

clare at snyder.on.ca wrote:

The Olds Rocket lived on into the early 1990s. It was the "5.0L" (about
307 CID) and "5.7L" (350 CID) engine used in the Cadillac Broughm
(formerly "Fleetwood Broughm) up until the time that they started
putting the Chebby LT-1 350 in the Broughm, the "bathtub" Caprice, and
the Buick Roadmaster.

Posted by Eeyore on January 2, 2007, 2:01 pm

dido wrote:

result in




It varies from car to car depending how clever the ECU is typically.

European and Japanese cars typically prefer higher octane fuels btw. In the UK
I've never
seen less than 95RON fuel ( that's 91 in your US PON figures ) and 98 RON is our
available top grade ( 94 PON ).



Posted by y_p_w on January 3, 2007, 11:56 pm

Eeyore wrote:

I'm not sure about those numbers.  The difference is highly dependent
on the individual fuel.  It's also called Anti-Knock Index (AKI), and
on the pump the label typically says (R+M)/2, as the average of the
RON and MON.  I remember there was a recommended set of RON and
AKI octanes in a 2001 Toyota Camry owner's manual.  I don't recall
off the top of my head.

Posted by Eeyore on January 4, 2007, 3:18 am

y_p_w wrote:

They're typical numbers according to a site I found. (R+M)/2 is the same as PON


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