I decided to start a new link that had a more helpful heading, original link here: https://forum.studebakerdriversclub....hom-this-today
Quick synopsis: after wondering about ignition timing. I was wondering about my valve timing, due to low vacuum and a hot cam. Doofus pointed me to how tho check valve timing in the manual, and thanks! There was some back and forth about cam card clearances vs stock cam clearances, and even that was convoluted, as the stock cam clearances and the clearances for checking valve timing are not the same. So I decided, right or wrong, that I would get #6 up to IN-OP (per manual) and check the clearance on the #1 intake. The result was 0.015", or about halfway between a stock cam clearances, and the cam card. I tried the stock clearance next, then the cam card clearance, and lets just say that I do believe the cam timing is indeed, correct.
Now back to the carb futzing: This whole thing started because the carb runs rich at anything but idle. ( Daytona Carbs remanufactured Carter AS, on a modified OHV6), and the vacuum is always low. Cam was reground to a 3/4 profile, and low idle vacuum is not surprise, but it seems low at speed too.. So we now know that the valve timing is correct, there are no vacuum leaks, ignition timing is correct, multiple vacuum gauges have been tried, so, to my mind, we are lead to the grind of this cam. I do have a stock cam and lifters I can install, but want to see if I can solve this Rubik's cube first.
If I am not mistaken, low vacuum causes a carb's power circuit to kick in, correct? If that is correct, what might I do to the Carter AS to make it less sensitive to low vacuum?
I know, I can always go back to the stock cam and probably, my issues will disappear, but I want to know what I could do to lean the mixture before I go to that effort, mostly for my education.
Quick synopsis: after wondering about ignition timing. I was wondering about my valve timing, due to low vacuum and a hot cam. Doofus pointed me to how tho check valve timing in the manual, and thanks! There was some back and forth about cam card clearances vs stock cam clearances, and even that was convoluted, as the stock cam clearances and the clearances for checking valve timing are not the same. So I decided, right or wrong, that I would get #6 up to IN-OP (per manual) and check the clearance on the #1 intake. The result was 0.015", or about halfway between a stock cam clearances, and the cam card. I tried the stock clearance next, then the cam card clearance, and lets just say that I do believe the cam timing is indeed, correct.
Now back to the carb futzing: This whole thing started because the carb runs rich at anything but idle. ( Daytona Carbs remanufactured Carter AS, on a modified OHV6), and the vacuum is always low. Cam was reground to a 3/4 profile, and low idle vacuum is not surprise, but it seems low at speed too.. So we now know that the valve timing is correct, there are no vacuum leaks, ignition timing is correct, multiple vacuum gauges have been tried, so, to my mind, we are lead to the grind of this cam. I do have a stock cam and lifters I can install, but want to see if I can solve this Rubik's cube first.
If I am not mistaken, low vacuum causes a carb's power circuit to kick in, correct? If that is correct, what might I do to the Carter AS to make it less sensitive to low vacuum?
I know, I can always go back to the stock cam and probably, my issues will disappear, but I want to know what I could do to lean the mixture before I go to that effort, mostly for my education.
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