I have a home made billet 4bbl tbi I'm testing. It has 1.75" bores and an integrated spacer with 8 injectors spraying beneath the throttle blades. It's on a 350 with phase II Bowtie heads, a mild cam, and Performer intake. I'm having trouble getting it to idle below 1000 rpm. I've tried 6 and 14 degree throttle blades with similar results. The blades are sealed up way tighter than the 600 cfm 4160 I'm replacing. The primaries on the Holley are slightly open. This thing is closed tight. If I plug any two of the bores it drops to 600rpm. If I plug three, it dies. I can get it to idle nicely at 700 rpm by leaning it way out. (19:1+) I can still let out the clutch and it tries to climb over my wheel chocks. Both the carb and injector are pulling down to around 40 kPa at 700, but the carb afr is in the low 12's. I can lean it out until it barely idles and shoot carb cleaner at it. I get a good rise at the throttles of course and a slight leak at one of the throttle shaft bores. I brought it inside bolted to another Performer and pulled a vacuum with the central vac. Listening with a hose, the only audible leak is small and at that throttle shaft bore. I completely drained it out but of course I've already been asked why the "whole house smells like gas." I don't smell anything. I'm going to o-ring the throttle shafts tomorrow. What do you guys think?
Thanks,
Kevin
Thanks,
Kevin
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