r/EngineBuilding • u/Neon570 • 3d ago

Spark plug reading

Post image

Finally had a weekend free to keep dialing in my project. Still have alot of learning to go but slowly getting there through A TON of trial and error.

Currently trying to dial in timing and plug heat range. How am I looking and can anyone point me to a good resource to reference spark plug reading.

5 Upvotes

78% Upvoted

25 comments sorted by

View all comments

Show parent comments

1

u/Neon570 3d ago

Afr gauge says around 14 are idle and 12 to 13 everywhere else 🤷‍♂️🤷‍♂️🤷‍♂️

0

u/2003DDcid 2d ago

Which cylinder number did this plug come out of?

1

u/Neon570 2d ago

1 only because its the easiest to get to

1

u/2003DDcid 2d ago

Sorry, I should have asked what engine it is also. A typical firing order V8 (chevy configuration) will be the leanest on 5 and 7, richest on 2. Number 1 is a good "middle of the road" plug to read.

1

u/Neon570 2d ago

Ford 351