plug analysis Options

[last337]

I was having a hard time getting the carbs tuned and I had a hard time getting the car started when cold too. I finally got running again today and tried to adjust carbs again only to find that two carbs would be pulling much harder than the other two at different throttle ranges. There didn't seem to be a way to get them synced correctly so I pulled plugs and found those two to be very heavy in carbon. Is that what was happening? Can someone explain why this was happening how it did?

[brant]

so when you say that the 2 carbs pulled harder than the other two
do you mean one bank (say right) pulled harder than the other bank (maybe left)?

if that is the case then adjusting the linkage arm on right versus left should equalize the two banks

there is an air adjustment on the car for equalizing forward carb to rear carb on the same bank..... but that doesn't sound like your problem as I read it.

sometime the linkage is worn or sloppy (or of poor design) and makes that balancing of right and left more difficult. Also try balancing at a certain rpm.. say 2200rpm instead of idle


you might have carboned them during your adjustment some...
but the two banks have to be balanced. Otherwise your going to keep getting more air to one side than the other causing one bank to be lean the other more rich in comparison. This assumes that the jets are the same in all of the carbs of course.