Take it off. Put it back to factory specs. Regulate to 6# fuel pressure. Follow the setup and tuning steps in the user manual. Worst case - weld in an exhaust bung and get some A/F readings. Otherwise you're chasing your tail, and (if you're like me) unnecessarily contemplating dropping $350 on a new carb just to stop the headache. Instead, go back and take it step-by-step… presume nothing… do it all by the book and see what happens… and keep us in the loop.
A little more rock-and-rolly...... Meanwhile back at the problem, you say the car starts great without a choke---- that indicates a rich condition to me, plus the high idle at traffic lights indicates a failure of throttle return. Perhaps you need to fiddle with the choke and high idle settings.
Changed the carb for a dead stock Edelbrock 600. Runs just o.k. has a pop when reving steady and yes there is a drip of fuel when at idle. Not satisfied yet.
Have had similar issues with Edelbrock carbs--now set pressure at 4 1/2 to 5 pounds-seems to help. Just fired a 327 with 9.5 to 1 comp, Crane 266 cam and Edelbrock 1406. Runs great with no flat spots or rich condition. Also find that floats are not set correctly out of the box.
Butch, went back into your post history and seems you've some sort of gremlin of one kind or another with this engine for ever. The very first step in trouble shooting a fuel related drivability issue is to verify your fuel pressure. The carb is designed to have a desired output with a designed input. If the input is wrong, the output will certainly be wrong. So what's the fuel pressure ? Maybe you have a fucjed up needle valve, maybe a bent rod maybe a bazillions other things or maybe you have too high of fuel pressure that's over riding the design limits of the needle/float. What's your manifold vacuum at idle? This is step 2 trouble shooting fuel delivery drivability issue. Different power valves and springs are designed to work at different idle vacuum levels. If they don't jive you'll have trouble. With out a measurement you have no idea which one you need. The same goes for your vacuum pot on the distributor. 1 Backfire usually screws up the power valve too. I see symptom spouting- I see question and suggestions to you -
Bernoulli and Venturi would be good fellas to talk to about this. Ever have a 56 lb dog jump and stand on you while you were laying down ? That's roughly 14 lbs per square inch (paw) on just 4 inches of your body. Almost atmospheric pressure. That's a lot of pressure when you think about it.
Yeah, but they are both dead, and people like mythology better than facts, anyway. Posted using the Full Custom H.A.M.B. App!
Lmao ! It sure would have been nice if those guys wrote down their theories and discoveries along with the principals. Damn the bad luck
My favorite HAMB myth is "the carbs too big, I'ma gonner jet 'er down". This is almost always in conjunction with "the formula". ****in hilarious. In fact, if the carb is really "too big", you will need to jet it UP to compensate for the reduced booster signal... Pressure drop, ooh pressure drop, pressure gonna drop on you...
Forgive them George because they know not what they do. You can lead them to the well but you can't make them drink, you can't even give them the kool-aid. They'd take the red pill every time and stay blind to the facts and reality of it all, or was that the blue pill for that ? You could give them the key and point at the door and it won't happen. You can write and link and validate and it won't change. Point is its pointless now and will remain that way.
Forgive them George because they know not what they do. You can lead them to the well but you can't make them drink, you can't even give them the kool-aid. They'd take the red pill every time and stay blind to the facts and reality of it all, or was that the blue pill for that ? You could give them the key and point at the door and it won't happen. You can write and link and validate and it won't change. Point is its pointless now and will remain that way. As the Smoke once said, "you can lead a horse to water, but sittin' on his head wont make him drink." Philosophy majors? hell no, just a small handfull of guys who didnt sleep through grade 8 physics cl***, and actually understand how carbs work. Thats ALWAYS trouble on here, and 31vicky has it EXACTLY right.
Well: I've lost all contact with reality from those last few posts????? Thanks everyone for the input. Im' going to put some scopes on it.
Hmmm.. several others with same setup and no problem. Starts great with choke wired open? I think something in the carb or fuel system set up is out. Starting well with absolutely no choke in almost any climate suggests richness at least in the idle circuit to me. Richness of the other 4 systems is strictly TBD. Although too high pump pressure or similar and sometimes related float height can affect all the systems to some extent. I'm not familiar with edelbrock carbs to know of potential internal fuel leak sources.
The Jalopy Journal
