i was wondering if anyone has replaced there 4bbl with a 2bbl if you have could you explain. im thinking of putting a carter 2bbl on mine.

 

Any particular reason you are considering doing this?

 

Ill guess

Lead foot
[Can't stay out of all 4 if they are there, they can be locked out on a qjet if temptation is to much.]

 

the car is going to be my dd and a 305 isnt exactly fuel effiecient so if a 2 bbl uses less gas that would be good.

 

The driver has more to do with the fuel consumption rate than the carb.

 

i want it to get more then 17 mpg

 

17 MPG city....you can do it if you don't mind being a slow and patient driver.

17 MPG highway...that's easy with a 305, especially if you have an overdrive transmission. If you've got a healthy 305 and 700-R4, you can hit low/mid 20s without too much difficulty.

You probably need to start thinking about a good tune up first, and making sure all of the basics are good. I can't really imagine how a 2 barrel swap would be worth the effort unless you've got a nice fresh 2 barrel carb sitting around and your 4 barrel unit is worn out.

 

If its a qjet, you can easily lock out the back two.

 

On my 1987 LT with the 4bbl. 305, i've gotten anywhere from 9 mpg's (Lead Foot) to up to 18+ mpg (normal, everyday driving in rare non stop n go driving). A well tuned vehicle with clean filters and a good tune up will yield those numbers. So I am in agreement with 80smetalfan

Is your Camaro the only vehicle you have?

 

it is going to be my car but at my house there are 2 other cars that get 25 where i live its all stop and go

 

Most people don't believe it but my old daily driver '85 Trans Am with an LG4/auto would get 25 MPG city and 30 highway.

I know it's hard to believe but there are other people (at least one on here) that can confirm it. The car was just a MPG freak.

 

I believe the 30 MPG highway. My old 91 with a L03 TBI/700R4 and 2.73s could do 30 MPG highway pretty easily. I even did one 1500 mile trip over a weekend where it was nearly all long highway drives and hit 33 MPG at one point. Lots of people on the TBI boards have gotten 25-30 MPG with L03 cars.

It's all in the tune. Even on these Quadrajet cars, you can get away with pretty good mileage if you spend some time getting a good fuel tune and getting your ignition timing dialed in. I have no chance of getting anywhere close to 25 city with my 455 car, but I can do better than 20 on open highway driving without too much trouble. I know a guy with a built 11-1 Caddy 500ci in a 80s Regal and a 200-R4 that gets 21-22 MPG on the highway with a Quadrajet.

 

Driving to and from San Diego I average between 26-28 mpg. The quadrajet is a good carb if properly tuned. Btw, anyone tried that Holly fuel injection carb replacement that has the injectors that look like four eggs?

 

All depends on how fast you drive city, if your doing 50 plus in the city with few stops.......

How I get high city in mine, all very long country blocks, that let you do near 50 or more without worry.

 

I suspected as much, so that's why I asked.

You won't do better than the stock computer q-jet for fuel economy. The 2 bbl is older, bigger, has less refined circuits, and will use more gas than the q-jet.

To say nothing of the gas you can buy with what converting to a 2 bbl will cost you.

 

the 2 barrel carb wont change much but the fact that your secondaries wont open up past 4 grand ish, obviously cause they arent there. save yourself the work just drive conservative :] thats how i get my MPG with my Camaro. Plus on a stock q-jet the primaries are small they provide quick take-offs and use less gas. My dad took off his 750cc holly carb and but back on his stock q-jet to save gas and now he gets 24 MPG around NYC