I know there are lots of threads on this topic. but none seam to be able to help with my problem. I recently rebuilt my motor. now running 135 lbs compression across the board. i am running a carter bbd 2 barrel carb a pace setter header. ngk v power plugs. one step hotter than stock. (the burn on the plugs looks pretty good if any thing a little on the lean side) right now the timing is advanced as far as the distributor will allow. and i have managed to minimize the dieseling. but still on occasion it will diesel. I am currently running the distributor that has 2 stages of advance. but only have one stage hooked up. (the bottom stage) to a port on the upper side of the carb that has vacuum when above idle but nothing at idle. i do not know what rpm my idle is at but i know its pretty low. ( ac pump all but kills the motor at idle) I have tried to retard the timing and that only made it worse. also i have eliminated all vacuum except the advance. and running an electric fuel pump with about 4 psi pressure. with no return on the carb to the tank. I am currently getting about 22-25.75 mpg and thats running 75-80 on the freeway. and 35 around town about a 50-50 split on a tank of highway and city driving.
so my questions are
1. any suggestions on the dieseling issue?
2. what mpg does every one get?
3. if i were to add a return to the carb (drill and tap a port) would i want to regulate on the return side, or the inlet side and does the 2.5 psi every one has posted really work?
This site and all original materials contained herein are Copyright 1999 - 2013 by OutdoorWire, Inc. -- All Rights Reserved.
You may link freely to this site, but no further use is allowed without the express written permission of the owner of this material.
All corporate trademarks are the property of their respective owners.
This publication and OutdoorWire, Inc. assume no liability for your use of the material contained within this site.
OutdoorWire, 4x4Wire, SUVWire, JeepWire, MUIRNet-News, and 4x4Voice are all trademarks and publications of OutdoorWire, Inc.