Cliff's Quadrajet Parts and Rebuild Kits

Quadrajet Problem Solving => Diagnose a Quadrajet carburetor problem => Topic started by: Mr.Pontiac on June 24, 2013, 06:59:04 AM

Title: 800 cfm Race car running a little rich, Help!!
Post by: Mr.Pontiac on June 24, 2013, 06:59:04 AM

Running off 65 jets only up front, Mr. Ruggles helped me set up carb. using small float set at 1/4 inch, lately (changed nothing) at idle seems to be running rich, plugs foulded once.needle seat,was.135 changed to .130. Worried that the 800cfm might be a tad to much carb. for my small 400. Electric pump , regulator , pressure set at 7 psi. runs great once moving. no choke.
Idle tubes set .036, idle down set at .052. Secondary well opened to .035.

Title: Re: 800 cfm Race car running a little rich, Help!!
Post by: omaha on June 25, 2013, 12:06:51 AM

what cam and what rpms does it idle?  Close cam lobes don't like idling either so a bit rich is normal with a bigger cam with tight lobes.  How much vacuum are you pulling at idle?  I don't know, nothing seems too out of line.  do you have any bypass air? If you pull a small vacuum line does this help the idle? How about initial timing? have you done any experimenting with timing? What plugs are you running? Is this a chevy engine? sorry for all the questions.

Title: Re: 800 cfm Race car running a little rich, Help!!
Post by: omaha on June 25, 2013, 12:08:46 AM

sorry I didn't put 2 and 2 together. MR. Pontiac kinda explains what engine it is.......duuuhhh!