Hugh, I get 13.6-14.9 mpg on the highway at 70 mph depending on the terrain.
To my knowledge the engine has never been apart. I do suspect carbon buildup
as the culprit in enhancing the ping. See my previous post concerning the
lengths I have gone with timing, plugs, chassis dyno etc. Someday when I
rebuild the engine, I will use the 1957 9.25 to 1 compression pistons to
rectify the situation permanantly.
>From: "hugh hemphill" <hugtrees@xxxxxxxx>
>Reply-To: mailing-list@xxxxxxxxxxxxxxxx
>To: <mailing-list@xxxxxxxxxxxxxxxx>
>Subject: IML: need 94 octane in a 58 Imp ?
>Date: Mon, 25 Feb 2002 19:59:23 -0600
>
>From: "Robert Dervin" <rjdervin@xxxxxxxxxxx>
>
>
> > I need to run 94 octane in my '58 along with a bottle of booster just to
> > keep the ping out. That is with only 6 degrees BTC initial and only 19
> > degrees total advance. Other added advantages to premium fuels are
>better
> > detergent, more consistancy and smoother running.
> >
>This is a thread that can go on ad infinitum if not ad nauseam. I am
>interested to know what kind of MPG you are getting on this car with the
>current engine set up. It seems to me there is no such thing as premium
>fuel. It is all the same stuff, only the plus and the supreme have
>additional additives. The latent power is exactly the same. the additives
>serve to provide a higher resistance to knocking or pinging and that's it.
>I have never heard of detergent in gasoline, but that does not mean much.
>
>I dare to suggest that few people with these engines have to go to the
>lengths you are going to, Bob, to avoid knock. I certainly do not have to
>do anything like it, and, as admitted, having been educated in frugality by
>the Scottish education system and culture, I run 89 octane in mine.
>Dimitrios tried to show me the benefits of running higher octane gas in the
>engine with the timing advanced, but I found it to be very unsatisfactory,
>and was glad to get the backing of engineering reports published in 1958 to
>provide quantified, objective, analysis on the subject. Objective in as
>much the report was not created at the behest of either the car or the oil
>industry.
>
>I suspect, Bob, your engine has some significant issues for which the use
>of
>the knock suppressing gasoline is only a band-aid. That is why I am
>interested in your MPG. I am using rough estimates, because my odometer
>does not work, but I am running at 16 to 17 MPG on the highway in my '58.
>Stop start traffic kills MPG in the car. It really is scary seeing the
>needle drop as I crawl along in crowded situations. But, out on the open
>road, the car runs quite parsimoniously.
>
>Hugh
>58 Imperial
>
>
>
Back to the Home of the Forward Look Network