I had no luck on the search and I know it's been posted before. I am looking for a total advance timing and the RPM at which it shold be. I can't get my car below 1000 rpm even after warmup. No carb and intake and from RB with an open exhaust 12A (1980). I set my timing ABOUT 2 DEGREES advanced since I could not get it down to 750rpm. Will that do? Yes, the idle screw is all the way in.

 

LET ME KNOW if you find this out I have the same problem. Even at 1000 rpm it dies from time to time when I come to a stop.

 

Total should be 24L 16T. Thats above 4k rpm's.

 

Different things can cause this.

Some fixes:

1. Raise the floats 1mm so there will be a little more fuel in the float bowl. This will set the fuel in the float bowl glass to just a hair above center. When you come to a stop fuel sloshes around the float bowl and the fuel jets could go dry and stall the motor.

2. Clean and/or rebuild carb. Run some gumout fuel system cleaner in the fuel tank.

3. Need a tuneup.

4. Vacuum leaks.

 

24 degrees BTC on the leading is correct, but at 6000 rpm. I can't find a reference to 16 degrees trailing in any of my references. Racing Bleat says 5 degrees for the trailing with 24 degrees of leading, but I should add that this is for a bridge-ported motor with open exhaust.

 

check you fuel filter

mine idles and runs rough from a clogged gastank inlet

 

6K? All the advance is done by 4K. WHat info are you using WG?

 

That came from my 1985 Racing Bleat catalog.
6K is what it said, I suppose some of the info may have been revised since 1985, but I still think it's a valuable reference as it's focus is entirely on the early stuff.

So you are saying that the vacuum and mechanical advance in the distributor is maxed-out by 4000 rpm?

 

Yup, on a 1st gen 12A anyhow. Actually it maxes out at like 3600 IIRC. Have you ever verified it? It works that way on both my cars.

 

I'm not doubting you, I know for a fact that RB fudged a little in favor of surety in the early years. Running the motor up to 6000 rpm certainly makes damn sure that it's at full advance, eh?

 

Certainly does now doesnt it.