Re: [Amc-list] 195.6ohv ignition timing and mileage (and therefore, power)

["Bruce Griffis" <bruce.griffis@xxxxxxxxx>]

24 is really good, and 22 for the year is great! I recalculated mine,
and got 18.4 for the first 400 miles. I need to do a decent tuneup. I
gotta get it in the 20's.

The twin-stick is really cool, and after 45 years, it has earned a
place in your car. But I can understand wanting a T4 or T5. However
you go - I'm sure your American will be cool.

On Sat, Jul 5, 2008 at 8:46 PM, Tom Jennings <tomj@xxxxxxx> wrote:
> I'm pushing close to 24mpg now, with 22mpg average for the calendar year.
>
> A month or so back I started bumping the ignition timing (advance). It's
> done the expected performance and mileage improvement. It has NEVER pinged.
>
> Put the timing light on it today to see what I was at -- 20 (twenty)
> degrees static. It made no sense until I RTFM'd again, and forgot that
> the distrib specs are:
>
> (10 degrees static recommended)
> 10 - 12 total mechanical advance
> 11 degrees total vacuum advance.
>
> So 20 static isn't insane, just too much at idle, where it doesn't
> matter so much. It does idle smoother with less advance, it's a little
> poppy.
>
> It's got a Pertronix unit and hot coil, and looser springs so my advance
> comes in around 1800 I think.
>
> My plan is to modify the distributor for more mechanical advance, like
> 18, then reset the static to something sensible (10 - 12).
>
> Then I can see if more vacuum is called for. Not even sure what a ping
> in this motor would sound like!
>
>
> Since I've not leaned out the carb etc, it's all free horsepower, and
> man, a few HP here is quite noticable. This car is now up into the
> "peppy" category. There's no problem keeping up with traffic, and only
> the wide-spread gearbox is holding it back.
>
>
> I haven't forgotten the T-4/T-5 business... Though I'd hate to give up
> twin stick, a 4-speed (or 5) would really be tons faster. I could
> probably sell my cherry T-96+OD for more than what a T-4 would cost me!
>
>
> Hmm... make the OD lever be reverse and I could keep the shifter I got...
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