Already tried the Autolite thing (3 different heat ranges), the Champion
thing, the Bosch thing, the retarded timing thing. Actually spent 55
exhaustive hours on a chassis dyno logging and adjusting total advance with
a knock sensor and an exhaust gas analyzer. With this vehicle, Splitfires at
a .40 gap have the least amount of ping. Champions had the most amount of
ping. Ended up at 6 degrees BTC initial and 19 degrees total advance at an
early 1500 rpm. Logged 245 hp at the rear wheels @4200 rpm.
Also installed a Pertronix electronic ignition module and a 40,000 volt
coil.
>From: Christopher Hoffman <imperial67@xxxxxxxxxxxxx>
>Reply-To: mailing-list@xxxxxxxxxxxxxxxx
>To: <mailing-list@xxxxxxxxxxxxxxxx>
>Subject: Re: IML: 100 octane in a 58 Imp ????
>Date: Mon, 25 Feb 2002 20:11:14 -0800
>
>Robert Dervin/rjdervin@xxxxxxxxxxx wrote:
> > 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.
>
>I can run my '67 on 89 without additives and get no pinging (ever since I
>switched to Autolite plugs years ago). The car runs cool and can handle the
>hills without feeling challenged. The engine has 125,000 miles on it (as
>does the rest of the car) and has never had the heads off. It burns no oil,
>starts easily even it sits for six to eight weeks, and returns 14 mpg on
>the
>highway.
>
>My '78 NYB with 17,000 miles and its original Lean Burn intact runs great
>on
>89 as well, but I tend to treat it to 91 out of habit (and because I rarely
>drive it). I'll let you know how it survives to 20,000 miles. Ask me in
>another 10 years!
>
>IMHO, anything over normal pump premium (which is 91 octane here in CA now)
>is unnecessary. I'm sure it would love the treat of 100 octane, but to me
>there is no need to worry with ordinary gasoline of a good brand name and a
>reasonable octane rating. I also believe Chevron uses the same amount of
>Techron in all its octane ratings, so there does not seem to be a detergent
>advantage to premium these days, either.
>
>Go with the Autolite plugs, set the timing 4 degrees retarded from spec,
>and
>enjoy!
>
>Chris in LA
>67 Crown
>78 NYB Salon
>
>
>
Back to the Home of the Forward Look Network