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Original Message
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| RE: Edelbrock RPM cam & rhoads lifters |
| By bprewit - 03/08/2004 4:53:02 PM; IP 209.240.161.70 |
| I found a few tricks to getting better idle quality and actually a bit more low end torque/throttle response by tuning the carb a bit. I have a holley 750 vaccum secondary and found that to keep the slightly higher idle I needed to adjust the secondary butterfly idle screw a bit. It is a tiny flathead screw on the secondary side right by the butterfly shaft where the vaccum diaphram linkage connects. That allowed me to close the primary side butterflies a bit more and not expose as much of the transition circut which helped acceleration off idle. Also for the idle I needed to drill 1/8" holes- one in each of the primary butterflies opposite the side of the idle/transition circuts. That helped to lean out the mixture at idle and I could fine tune the idle mixture screws better giving me a much more stable idle. Hell I even went a step further and added a primary metering block to the secondary side, completed the idle mixture circuts by drilling the main carb body and throttle plate, blocked the primary/secondary connecting circut, and now have 4 corner idle adjustment and excellent idle quality. Another thing that made a big difference was adding a 4 hole carb spacer. I have tried no spacer, 1/2" and 1" open spacers, 1/2" and 1" 4 hole spacers and found good and bad things about each one. The open spacers especially the 1" gave me hard pulling top end, no spacer gave me explosive midrange, and a 1/2" 4 hole spacer gave me better low end throttle response and torque. Try different spacers of different heights to see what your particular engine combo likes for your style of driving. |
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