Tuning with jets, Power valves and an O2 guage
Sounds like you got the carb figured out :cheers:
I wish that I did.
Yesterday the #90 jets and clean air bleeds resulted in a change of the A/F numbers. Today I road tested it and it ran PIG rich under a load. It went below 11.0 at part throttle.... then it was starting to detonate again.
What !!?? How is it possible to be rich AND detonate at only 33 degrees? I've read that all it takes is for one cylinder to run lean for the engine to detonate. If the 850 has a defect that feeds the left bank, it wouldn't show on the A/F guage. This A/F guage only came with ONE 02 sensor. My exhaust system has no H or X pipe, so each side is isolated from the other. If Cyls 1357 have any lean issues, maybe the engine detonates as a result?
I swapped the #88 jets back in. The #90 jets were obviously too much. Now with the #88s, it idles clean in Park. In gear it goes up to 16.0+/-. On the road it still runs in the 11.5 to 12.5 range.
I'm wondering if the carb needs to be chucked.
Tomorrow I'm going to road test the car with the Holley 750. I had it on the engine yesterday to see what A/F numbers it would make, but I didn't road test it. My thoughts are that if the car runs okay and does not detonate, that tells me that the Demon carb is to blame. If the car still knocks with the Holley, I'll have to look elsewhere.
