Thread: Help to get off the line please!

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Originally Posted by glennsexton

My first thought is that you you may be rich on the primary jets/metering. The Edelbrocks are a bit rich out of the box and if you had a 1406, I would point you to their (Edelbrock's) web site for the instructions on how to diagnose and then replace the jets/metering rods. I'm assuming that you have a true "AFB".

While I suspect that your Carter may be a jet size bigger than it needs to be, a quick check can confirm. If you have a good shop near by, they can sniff the exhaust and tell you if that's the problem. I'd try that first

All good info... I have both Carter and Edelbrock manuals, which look suspiciously identical, I guess I should get the Tuning Kit that has the assortment of rods and jets. Yes my Carter is a true AFB

Originally Posted by Dave Severson

Transition circuit is a step or two fat... As Glen said, most are fat out of the box... If you don't have the Edelbrock calibration kit, you'll need to get it then follow the chart in the book (or on the Edelbrock site) to get the carb dialed in... Once you get the calibration right on the carb, you may want to reconnect the vacuum to the ported side of the carb, then work on the vacuum canister to slow down the advance rate a bit.....

I have gone over the chart, don't really understand it yet, and have called Edelbrock tech spt, they pointed me towards step up springs and accel pump rod holes - I tried ALL they suggested and have not seen any significant improvement at all.

From what you two gentlemen are suggesting I might want to change metering rods to one with a smaller rich-step and/or go to a leaner main jet - did I get that right?

Originally Posted by ted dehaan

sorry I disagree I think the transition circuit is too lean because the float level is too low when the throttle plate opens and uncovers the the trasition port the manifold vacuum drops rapidly and the the t port relies mostly on ventures pressure difference to flow fuel called Bernelle's law especially at w.o.t. just my opinion I could be wrong .....ted

Just for argument sake, based on my very finite understanding of carburetion, would we be able to diagnose too lean/too rich at transition by how the engine reacts to flooring the pedal? For instance, too lean and the RPM would increase and stall due to fuel starvation vs. too rich the engine would flood and bog and possibly stall. Just thinking out loud here...

I can and will check/set float levels when I inspect/change jets, but am not sure this is part of the problem, no fuel starvation at WOT so far, but I haven't check fuel pressure yet either...

Thanks to Ted, Glenn and Dave!