Broma Malo Racing

Hi there every one i am new on this forum i am looking for answers
I bought a mazda rx7 1983 with a 13b bridgeport it had a carb 3310-10 holley
On it but it wasent working good so i orderd a new carb 4160 holley but now
I am having problem it starts idle but when i go for a drive and i step on the gas it bugs down then it picks up speed but slowly can any one help me with that problem

SOsavanna

I'm no Carb expert on a rotary, but from my experience, it sounds like it is getting overloaded with air ( most likely) and the fuel isn't keeping up with it, def search here for carb tuning tricks, plenty of guys on here are wizards, or if you have the ability take it to a local guy who tunes carbs, you'll most likely have to adjust jets and things of that nature to have it run correctly. Carbs rarely work perfectly outta the box, because each engine is different! Good luck!

Broma Malo Racing

Ok i will have to find a way to do it my self becuase in my country dont havr rotary shops and dont have much mechanics here but thnks alot for the help

SOsavanna

Start with researching other people's jet sizing and go from there!

Broma Malo Racing

Ok i will do that i open the 3310 holley and i saw the sizes are 75 and 77 jets

SOsavanna

Look up 3310 vs 4160, they are big in camaros and mustangs, but essentially look like the same carb with different numbers, one being a model number and the other being a list number. Sounds to me like you may have manual secondaries, when our cars came stock with vac secondaries or your vac secondaries aren't hooked up correctly and open too soon bogging the engine. double check your vacuum lines

Broma Malo Racing

Ok yea the 3310 i got it with manual and the 4160 that i orderd comes with a pump but to me seems lime it dosent open or maybe the spring is to hard because when i give the gas all the way it speeds up but it dosent go over 5500 rpm and the enbgine is bridge so its sopouse to go higher then that to me

SOsavanna

Stock they should rev to around 7000 sounds like the secondary isn't opening up with the vacuum like it should, check to make sure it is hooked up and you don't have a leak

Broma Malo Racing

Ok i will do that thanks for the help out