Hybrid Car – More Fun with Less Gas

better mileage with higher octane? - Page 16

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Posted by clare at snyder.on.ca on January 5, 2007, 1:21 am
 
On Thu, 4 Jan 2007 18:54:34 -0500, "Solar Flare"


Factory CR on '69 Olds 350 rocket is 9.0 Up to 10.0:1 on the high
output version. 13.8 is VERY high.
The 429 Cobra Jet  Super Cobra Jet, or Boss 429 ran 11.3:1
That's the highest stock north american CR I've seen in the sixties.

The Olds Diesel was 22.1:1
Diesels can run from 15:1 up.


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Posted by Nate Nagel on January 5, 2007, 1:27 am
 
Just as another data point, I have a '63 Studebaker Avanti engine that
is spec'd at 10.25:1 CR but it's currently got composition head gaskets
so it's likely more like 9.75ish.  I think the "R4" version (304ci,
hand-assembled by Paxton Products, dual quads) was 12:1.  Yes, I would
very much like to try one of those, but I'm not sure how I would feed it :)

nate

clare at snyder.on.ca wrote:

replace "fly" with "com" to reply.
http://home.comcast.net/~njnagel

Posted by Eeyore on January 5, 2007, 1:52 am
 

clare, at, snyder.on.ca wrote:


My 1970 Rover 2000TC was about 10:1 IIRC and had a prominent label under the
bonnet  / hood insisting that *5 star* petrol be used - 99 or 100 RON IIRC.

To my amazement you can still even get something similar for classic cars.
http://www.jec.org.uk/thrust.htm

Graham


Posted by clare at snyder.on.ca on January 5, 2007, 5:32 am
 On Fri, 05 Jan 2007 01:52:47 +0000, Eeyore


Yes, the TC really liked Sunoco 260 back in the day. Responded well to
an extra 2 degrees of timing if you NEVER ran it on anything less.

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Posted by Eeyore on January 5, 2007, 5:47 am
 

clare, at, snyder.on.ca wrote:


Rover called the vernier adjustment on the distributor the 'octane selector'.
When I had it of course it had to be retarded to run on 4 star which was the best
you could get then.

It was a very nice car for its day. Probably the 'best' in some respects I've had
until the Saab I drive now.

Graham


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