Appreciate some input on spark plug reading
Several questions:
Can you cut the threads off and show us the porcelain?
What is the gap you're running on these plugs?
Was it breaking up at all the big end or did it just lose steam?
What fuel pressure are you running and what pump do you have?
Edit: Lastly, where are your floats set at?
Answers to your and the other questions:
1. Short of a hacksaw, I don't have a lathe or anything to cut off threads. I can say the porcelain is pretty much uncovered but will further inspect.
2. I run 0.035" gap and they all measured consistent at that.
3. It does not break up - I just think it could pull harder as it feels a bit flat to me. It runs 7.01 @ 96 in the 1/8 and 11.1x in the quarter with typical 60' times of 1.52 (best of 1.49).
4. The floats are set so fuel is dribbling out with the bowl plugs pulled. I run a constant 6 psi the entire length of the track (has a fuel pressure gauge).
⛽️ The car runs 93 octane pump fuel. When driven on the street (which it does see more than most would think) it does soot up the plugs from putt-putting around. But pulling the plugs after 1 pass and they immediately look like this i.e. they clean right up.
I looked hard to see about peppering which is why I pulled the plugs before I added any spark. I am familiar with that but do not see any evidence looking very closely. One of the pics does make it look like it though (but it is just the pic).
My initial thought is I think there's another 1-2 degrees I could throw at it just to see if the mph picks up. With no peppering and the ground strap coloring, I think it still looks like that nay be OK.
Thx to all for your input and responses!!
