Re: [Amc-list] trip to Santa Fe

[Wrambler242@xxxxxxxxxxx]

You may find a slight increase in economy with higher engine temps, but with high timing it may not work.
I've never been scared of letting the temps run in the 210-225 range on the 4.0L's. Any ping is usually very light, even on low octane crud. Which is all my RM will let me buy....
   The 258 may not like higher temps at all. Different head and bore could change everything.

I drove 600 miles in the 97 Cherokee sport last weekend, 4.0L, 5 speed, 3:08 axles, 4X4, 235/70 Uniroyal tigerpaws.
22.5 mpg average for the entire trip and I too was pushing it hard at times. It saw 80 mph more than once to keep from getting run over by one truck or another....

Picked up the other "spare" door for my American.
 I now have both spare doors, reasonably straight and rustfree and a right fender in like condition.
Still looking for a drivers side fender if anyone runs across one.

My retirement plan, or sooner, is too replace all the repaired rustbelt parts with nice rustfree unpatched stuff and respray in one of the newer pearl whites with base/clear...

Besides it never hurts to have spares for a 38 year old car!!!
--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5
" I was different before people dared to be different" 

 -------------- Original message ----------------------
From: Tom Jennings <tomj@xxxxxxx>
> Well I've been back for most of a week, but pretty much swamped. Moving
> in slow motion! Much home drama while I was away, I won't bore you all
> with it.
> 
> 
> Car (70 Hornet) ran totally great the whole way. It's 900 mi each way
> (Los Angeles to Santa Fe), and I drove solid 75mph, on mid-octane gas
> (88, 89). I'd spent some time getting the timing right last summer, and
> it was totally worth the effort.
> 
> I got 19.3 MPG averaged over 2180.1 miles. Not bad for a 258 auto at
> 75mph.
> 
> Parts of the trip were very hot (over 110 at midnight over the Colorado,
> near Needles CA), most of it was over 5000 foot altitude. Most of it was
> 80's and 90's. Santa Fe and Los Alamos are 6000 - 7000 feet; it idled
> poorly there, and I was too lazy to turn the screw in one turn and up
> the idle stop. But the Weber 32/36 DGEV is the best-behaved carb I've
> ever run. I've driven other cars with a Holley, and a Carter AFB, and
> neither did well outside their jetted range.
> 
> The only serious pinging I got was on the return trip, very high 90's or
> 100, climbing the Bristol Range in the Mojave. I had to keep it to 60 to
> keep it out of detonation. That was it. I probably should have made the
> one previous fillup on high-test (so-called).
> 
> I'm running a crazy amount of ignition advance after really solidly
> going through my distributor, picking the right weights, limits and
> springs. To do so I chose mid-range or better gas to minimize that
> effect, but I'll soon go back to cheaper gas and see if it needs
> retiming. 
> 
> Temperature-wise, I've got a new 3-row radiator and electric fans. Since
> it ran hot-normal the whole way, I turned the fan thermo-switch up so
> that it wouldn't be constantly running; I'd had it turn the fans on at
> mid-normal temps, for here in moderate Los Angeles. I'm leaving it at
> this new setting (which I'll measure later).
> 
> 
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