I need some help with my carb. Currently my '66 coupe has a '68 302 with stock intake and a holley reman 2 barrel...i was told its a 'rochester' carb. I'm having 2 big problems and I've been told that both can be solved by getting a different carb. I'm running a classic auto air A/C and when i turn it on the engine bogs down and theres even a bit of a shake, it just doesnt run smooth at all. Also im having trouble restarting after say a 15 - 20 min stop. After i've driven across town or somewhere for lunch, i go in, eat, come out and she just wont fire up like she does after sitting over night or for 4 hours at work. I have to either pump a few times or hold the gas down and she will fire up but with a bunch of smoke. I was told i needed to find a carb with an electric choke for the restart problems and one with some sort of start up solenoid or something like that for help with the A/C, it apparently causes the carb to idle faster when the A/C is turned on. Does that sound right? Do you have any other suggestions? Any idea which carb to get to accomplish all of that?

 

Is the carb properly tuned? And when was it last rebuilt/cleaned etc?

 

Holley makes a 500 CFM 2 barrel that will bolt right on. Give you about 10 hp also.

http://www.google.com/search?q=I+bou...w=1215&bih=614

 

the carb came with the motor which was new to me last summer, it hasnt been rebuilt since ive had it. the guy that put it in for me tuned it some and has played with it every time ive had to take it in (4 times since last summer) but it hasnt been tuned by a professional that i know of.

 

thanks for the quick responses...do i need to be concerned with manual vs. electric choke ?

 

electric choke will operate the choke for you (you just need to adjust it). disadvantage is that they occasionally kick in when the car is warm as well (just after start). manual choke. well only if you really want to pull on choke ***** while you're driving. has the advantage that you can set it exactly where _you_ want it. but personally I don't like them. as a kid I had a few cars with manual choke. always forgot to push it back in and annyoed the crap out of me.

 

You might experiment with the idle speed to find a happy medium for the a/c issue and may get by with no mods. Idling it up 1-200 rpms with no load may be exactly right for when the a/c is on if you can live with it. Otherwise, you'll be looking for an idle-up solenoid type setup - usually not necessary with the newer Sanden and similar compressors.

I doubt a choke will help with your 15 minute restart issue as that isn't enough time to cool off enough to need it unless it's 40 degrees outside. The smoke tells me it's flooded and you'd probably get it started faster by just applying the same amount of throttle WITHOUT pumping it. Try it, and if so, it's flooding. That means it's either time for a rebuild of the carb or you have too much fuel pressure. (I do with an electric pump and will be installing a pressure regulator for this exact problem) If your pump is stock and mechanical as I suspect it is, it's carb rebuilding time.

 

I have so much to learn about carbs, in all my years (I'm no kid anymore) I've never run a carb with a choke. Why are there so many choke issues? Why do people run them at all? They sure seem like a hassle.

When cold (30 - 40 degrees), 2 pumps on the throttle and she lites right up. Sure I have to give it about a min before I go but I never have any issues starting warm or cold. Will there be an issue below those temps? Maybe its the crud on the top of the carb.