FABO Gold Member
- Mar 17, 2017
- Reaction score
- Richardson, TX
I agree with you. Too many inconsistencies between pulls and it all points to fuel or carb. Choke is wired open. Secondary air door flap appears to be opening but cannot be viewed during pull due to dyno parts covering top part of carb measuring air flow. Throttle manually opened at carb. Does not open fully with dyno linkage.The 2nd set of run sheets showed a bit too lean on a full power pull, in the mid 13's at some points, then the last sheet shows extra rich in the 9's with no jetting changes....sumting wong fuel control/pressure wise...or secondary air door flaps are hanging-up. Are You sure in wiring the choke open there's no interference with any of the linkage/rods???
I think the second test here is going to be close to where it ends, a little more by getting the A/F and timing dialed in, pretty close to factory #'s.Well. Only suggestion I have is to compare to look for differences.
No way it should be that different run to run.
1. Possibly running on 7 cylinders
View attachment 1716142672
2. Discovered Running without 1 spark plug. new test on all 8. 600 rpm/sec
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3. Next day, no changes known. Air consumption way down, VE way down at the upper end.
View attachment 1716142675
old doesn't matter. when i worked at dyno shop our units were from the 70's and performed just fine.I regret not taking any pics. Did not see any wide band O2 sensors. Is there another way to calculate. The dyno looks old school.
I missed the dropped cylinder....
Maybe one of the ring gaps was too tight and broke ( clearanced itself) that happened on my engine due to camshaft installed incorrectly by alot