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

[Mark Price <markprice242@xxxxxxxxxxxx>]

Congratulations. I know how good it feels to get something like timing to work right!
 I think the T-stat is supposed to open at 195*. full opening is quick it almost flips open IIRC. I would not change to the 180* except for the fact that the lower operating temp may kill your residual ping. You want to keep the engine temp up as close to the 190+ range for good economy. But since your carbed and it's an easy swap and you have one, I'd probably throw it in and see what happens.
  I run a 180* in my American's 4.0L. It seems to run at the 1/3 hot zone on the stock gauge and runs fine. NO ping at all, I had it in to keep engine temps down as my shortblock is a warranty pull for piston noise when hot, so I thought I'd keep it cooler and see what happened. I've never heard said piston noise and enjoy my "free" 4.0L greatly!
--
Mark Price
markprice242ATadelphia.net
Morgantown, WV


---- Tom Jennings <tomj@xxxxxxx> wrote: 
> 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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