advice: carb tuning issues

[n2o abusn coupe]

well, i just put the new motor in 2 days ago and i'm having a low end surging problem... it surges at anything other than WOT.. at WOT it pulls hard and smoothly. also if i'm giving it a good amount of gas at any time and let off fully it will backfire. does this sounds like there is too much fuel getting into the engine?

- 1992 roller motor freshened w/new rings and bearings
- fms b-cam
- 1.6 crane roller rockers
- tfs twisted wedge aluminum heads
- tfs valve covers
- edlebrock air-gap intake
- solid motor mounts
- fms crank/waterpump pullies
- crane ignition box
- holley 600 vac secondary carb
- holley blue pump



and also does anyone have a tech writeup on how to change the fuel level on the carb? this is my first carb'd car and i need to learn all of this!

thanks, - brien

 

[dastang2]

sounds like a holley, try an edelbrock 600. is it new it may need a good cleaning and rebuild. adjust the floats. call the holley tech department.

 

[SwAmPf0x]

Check fuel pressure first

to set the floats, remove the sight plug from the side of the fuel bowl and adjust the level by turning the screw on top of the fuel bowl, you want the fuel level so it just barely trickles out

then set the idle mixture, (small screws on the side)

after that you can tune the jetting and acc pump

couple links....

http://jason.fletcher.net

http://www.carbdford.com