01-20-2016, 12:21 PM
i am gonna start with using the needles found in the carbs.
the overall plan for this thread is pretty complex.
first i've broken down a alky karb to separate components and half assed numbers near them to get everyone on common ground as to what things are.
i also did a photo group tutorial on the dycom or sharpy inking and how to sand flats flat.
the next step will be installing the new seat and parts and setting pop off.
i've bought 4 different spring tensions in groups of ten.
on the exact same carb i'll be testing the pop off of each spring in each group and creating a graph.
i'm also seeking out ANY info i can find on pop off pressure for alky carbs and will be posting what i find.
after i get that all done i have a brand new set of 334a's that i will be building as alky carbs.
on that project we'll be starting with it as a stock carb with ec birt alky parts added.
we'll track test it with 25% then 50% then 75% then full alky.
if we see a drop off we'll do some drilling but SteveO was supposing that they might flow fine as found and i want to do tests before drilling.
at some point i also hope o find a decent replacement spring for the mcculloch bdc carbs.
i have an exotic idea for the mcculloch bdc involving narrowing the venturie to reduce airflow.
the main reason a bdc double pumper is needed is the airflow as found in the double stack is to much to push ba1ance charge of alky through .
it seems to me if i reduce airflow i can get the bdc14 workable with alky.
But that is a whole other thread .
dave
the overall plan for this thread is pretty complex.
first i've broken down a alky karb to separate components and half assed numbers near them to get everyone on common ground as to what things are.
i also did a photo group tutorial on the dycom or sharpy inking and how to sand flats flat.
the next step will be installing the new seat and parts and setting pop off.
i've bought 4 different spring tensions in groups of ten.
on the exact same carb i'll be testing the pop off of each spring in each group and creating a graph.
i'm also seeking out ANY info i can find on pop off pressure for alky carbs and will be posting what i find.
after i get that all done i have a brand new set of 334a's that i will be building as alky carbs.
on that project we'll be starting with it as a stock carb with ec birt alky parts added.
we'll track test it with 25% then 50% then 75% then full alky.
if we see a drop off we'll do some drilling but SteveO was supposing that they might flow fine as found and i want to do tests before drilling.
at some point i also hope o find a decent replacement spring for the mcculloch bdc carbs.
i have an exotic idea for the mcculloch bdc involving narrowing the venturie to reduce airflow.
the main reason a bdc double pumper is needed is the airflow as found in the double stack is to much to push ba1ance charge of alky through .
it seems to me if i reduce airflow i can get the bdc14 workable with alky.
But that is a whole other thread .
dave