Timing vs carb jetting ????????

[strat1960s]

Ok, I know that when I got my numbers and made my adjustments I was doing it wrong. I left the vacuum hose attached to the dizzy. I plan to do it all again today with the hose off and pluged.
Here are the numbers and the effect they they had on how the motor ran.

38* was my initial setting and the car was idling out of gear between 1100 and 1140. Car was a little sluggish and would bog down on quick acceleration. (remember vacuum hose was attached)

30* with an RPM of 1100/1190 the motor ran like "poop"

40* with an RPM of 1100/1190 the motor was a little less sluggish.
45* with an RPM of 1130/ 1200 the motor was running like "poop" again

So it seems that is my range: 30* to 45*. I set the advance to around 41*/42* and drove the car around some. I can tell a big difference in how the motor responds to my "putting my foot in it". It's a little more lively.

I spoke with Ed Smith the owner of 5 Star / Ed Smith Performance. He said that with a Weber carb I could do 1 of 4 things to correct a slightly rich situation:
1. install smaller main jets
2. install larger air corrector jets
3. adjust the advance to compensate for the condition.
4. or any combination of the above.

I opted for adjusting the advance. I have been told that a fine tuned Weber would be every bit as effective as fuel injection. I guess I'm going to have to get into it to find that "happy spot".
When I get my numbers after running the test properly (with the vacuum hose off and pluged) I'll post them.

Ted

 

[Anonymous]

Are you sure that your balancer is not slipped? Those numbers are awfully high. Any car I have ran with that much advance sounded like nails being shook up in a tin can.

 

[strat1960s]

When I got those numbers, it was with the vacuum hose attached. When I reset the advance back down to 38* (with vacuum hose attached) and then pulled the vacuum hose off, the timing went back down to around 27*. I played around with it a little and found that I got the best responses with it set at or around 41/42* w/ vacuum hose attached. I retarded and advanced the timing to find my two extremes. I never had any pinging, but the way the enginge ran when at either extremes told me that I was near my limits. As far as the drivability, the car is much more responsive. I am still trying to figure out if I am running too rich though. I'll just keep playing with it till I figure it all out.
Ted

 

[JoeTrojan]

Those timng numbers are outrageous. I'd recheck your timing marks on the crankshaft. 38 degrees is a nearly fully advanced setting...not idle. getting into the 50 degrees BTDC range would cause major preignition even with jet fuel.

Hmmmmm

Initial vacuum-less timing at idle should be 8 degrees for a manual tranny or 12 degrees for an Auto...assuming a load-o-matic.

With my duraspark, 14 degrees BTDC at idle seems to work well. Total advance for the inline sixes with load-o-matics was about 14 degrees over idle timing setting...a total of about 26 degrees BTDC at high RPM, light load conditions.

 

[strat1960s]

Maybe I have been using the wrong timing mark.
my timing marks go like this:

14
10
6
3
TDC

When the engine shop had my car they used a yellow paint pen and marked the TDC. So, that is the mark I have been using.

Ted

 

[strat1960s]

Well, with everything going on that I had mentioned, whistling carb, loose port divider and timing vs jetting, the car is running really well. I normally had a hard time getting it to run when it is cold and rainy, but today the motor performed very well. My only problem/complaint is the idle when in gear.

Sometimes, the motor surges, like when at a complete stop. If I let off the brakes and coast at idle the car surges. But, once I get out of the idle RPM range the car purs like a kitten. I figure I may still have some work to do on the idle circuit of my carb.
Any suggestions?

Ted