Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - My spark plug colors, am I good or not?
View Single Post
  #4 (permalink)  
Old 05-08-2009, 06:36 PM
oldbogie oldbogie is offline
Registered User
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 8,192
Wiki Edits: 0

Thanks: 5
Thanked 860 Times in 716 Posts
Originally Posted by cobalt327
The center two plugs (especially) seem to have some small spheres of aluminum. I hope that's not what it really is- I've "doctored" the images to make them a little easier to see.

My left to right is your top to bottom:
That's just fuel chemistry, if this was lean, or the cylinder in detonation/preignition, the insulator would be white (if not white, white) and if the spots were melting aluminum off the piston that would appear as dark splotches on the insulator.

Reply With Quote