i think i found out why my car didnt seem liek it ahad all the power it should have,

when i pulled the air cleaner off the intake and held the carb wide open throttle the back 2 barals were still closed i even started teh car up and did it and they never opened up there is this flap over them i thought maybe it is suposed to open with vacume but im not shure.i can open it with my fingers tho pretty easily.
the carb is a Carter Afb competition series. i need to no how the metal flap is suposed to open on the back 2 barals of the carb with eatehr vacume or by a linkage that could be broken.

 

The throttle plates at the bottom of the secondary venturi will not open uless the choke has fully opened. {If it is an electric choke}. The top plate is operated by engine vacuum. It is also counter weighted . When the bottom secondaries open it opens the top plate by vacuum fairly slowly. Make sure the choke is open then go to wot to see if the sevondary top plate is opening. Hope this helps.

 

it was a little bit hard to understand i think my choke plate open manualy not electricaly but any way i know what u mean by those counter wates there is one on each side of the flap covering the back two barels. so when i give it full throttle when the engine is running the flap covering the back two barels should open up slowly not quicky.

what would happen if i maid the carb so that the flap that cover sthe back two barals alwase staid open would this hurt the car or should i just get it to work the way it is suposed to.

 

Trust me get the carb to work the way it is supposed to. if you open the cover 0over the secondaries and then hit wot there would be no way for the fuel metering system to compensate and you would have a lean stumble. Holley double pumpers are able to accomplish this however because they have a secondary accelerator pump . They can comprnsate for the sudden amount of air.

 

What cid is your engine and do you have any mods? what cfm is the carter maybe i can help with the power im kinda new to carb but im learnin fast.

 

the the carb looks brand new so im not going to rig it or anyhting im goign to get it fixed the right way ill let yah now how much power i feel that i got back out of it when its fixed.

im pretty shure the last owner of the car didnt even notice this cause he didnt no much about engines but i can tell there is a major bog when i put it to the floor and the guy that was riding with me was like ur other barals arnt opening and i wa sliek ok so i pop the hood and he was right and and i had to ajust the tv cable cause it wasint doun shifting when i gave it full throttle so i thought that that was the problem and making the engine bog cause it wasnt doun shifting but im shure now that it was both the tv cable ajustment and the other 2 barals opening.

should i notice alot more power ounce i get the carb fixed to ware the back two barals will open when they are suposed two, should it be a night and day difference.

 

the motor is an LG4 305 with the mods below.

Carter AFB competition series carb
Hooker competion headers
Wehin Stealth intake
Summit high flow filter
Crane Cam (not shure what size but has a pretty lopy idle)
excell plug wires
also the car has 2.5 inch true duals all the way to the back dumping into 2 flowmaster mufflers.

also the car has a had a complete tune up done all fluids and filter in both engine and tranny. the car has been sitting about half a year before it was driven about 15 miles the other day to the shop ware i fixed it caus ei no the owner of the shop and i am aloud to bring it in and use there lifts and such. i had to use a set of dealer plates cause teh car still isnt on the road yet till july 4 cause im 18 and have been short on cash to get it on the road i found out the boggign prob the day i broght it home and flogged it a little bit the guy that was with me has alot of car experiance and he sed it should be pulling alot more when i floor it and so happens he was right about the carb and the secondaries opening.

 

Well once again you may not really have a problem . the way i woud check this is to manually open the choke then turning the throttle back to wot and then manualy pushing the top throttle plate back and look down the venturis while you actuate the throttle back and fourth to see if the bottom secondaries are opening and closing. of course doing this while engine is off.!!lol

 

ill give that a try and get back to yah