[AMC-List] AMC six ignition timing -- got it!

[Tom Jennings <tomj@xxxxxxx>]

Must be my lucky day. I figured I'd be at this all winter.

I now have 32 degrees total advance -- with vacuum disconnected
-- and no pinging under load.

I will later this weekend plot a graph of the mechanical advance
curve, but I got it road-tuned pretty close today.

I'm now running 12 degrees static advance, 20 degrees mechanical,
by fiddling springs got it to come in about 3200 rpm. That did
the trick.

It begins to ping under heavy load when the coolant temp gets
hot-normal, eg. curb idle right as the electric fans come on,
around 200 degrees. Then it will ping. As soon as it cools
down driving, doesn't ping. (My test strip is Route 2, Glendale
Freeway north of Broadway etc, up to the foothills; 50 - 90 mph.)

It runs up to 4000 rpm without misfiring/popping (which I think
was retard, before). It's hard to keep a heavy load on the engine
above 4000 as I'm going too fast for urban highways. (75mph in
2nd gear is about 4300.)



Now I have to really figure out coolant temps. I have
a Mr. Gasket 195 degree thermostat in there. I thought "195
degree" means it begins to open at 195. Or is it fully open
at 195? I'm confused -- in cool air, flat and level, 60 mph,
sealevel, the coolant temp settles to a steady 172F. If I let
it idle, with the fan thermostat set to 200F, it cycles 195,
205, 195, 205, ... with the fan.

I have a Mr. Gasket 180 degree, I may put that in, but I don't
want the steady-state temp to drop to 160 or whatever!


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