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new build '66 hot rod engine has ghost idle ?
We built a 2.5 liter hot rod motor using my original '66 911 cases. 9.5:1 compression. 2.7 liter heads w/ 34 mm intakes, E-S cam profile, 1969-71 stock distributor. Non Bosch standard 12v coil. Webers 40IDAs rebuilt w/ 40mm butterflys, 34mm venturis, 175 main jets, 170 air, 55 idle jets, F3 emulsions.
Have two problems:
Ongoing lean pops out the carbs when off throttle and lower RPMs.
AND, developing just in past week a "ghost idle". When engine is cold it idles about 600-700 RPM, but when warm idles at 1800 RPM.
Is this caused by vacum leak in the Webers ? Timing advance in the distributor ?
Can anyone provide advice ?
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