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Weird Colorations on Plugs
https://www.slantsix.org/forum/viewtopic.php?t=24838		 Page 1 of 1
Author:  Rug_Trucker [ Sun Sep 09, 2007 6:35 am ]
Post subject:  Weird Colorations on Plugs
I pulled #1 and #3 plugs to look at them. Last time I pulled them they were fresh. Back then they gave the indication I was running dangerously lean.

I have since

#1. drilled the jets out to the next biggest drill bit size.

#2. changed to the proper PCV VS whatever fit the grommit :roll:

The PCV change added some bottom end torque.

Anyways it still pings badly.

Looking at the plugs with the ground strap int the center back the insulator has a dark brown half way. Then the other half is is a nice tan.

I didn't index the plugs if that's what you are thinking.

I have a set of 1 or 2 range colder plugs I will be installing after a carb swap. My BBD right now has a shaft leak :roll:

I am polishing and porting a '65 273(?) BBD.
Author:  Sam Powell [ Sun Sep 09, 2007 7:32 am ]
Post subject: 
I always thought that bown/tan color was what you were looking to see. I think the brown is caused by additives to the fuel.

Sam
Author:  DusterIdiot [ Sun Sep 09, 2007 7:48 am ]
Post subject:  Brown/Green...
Quote:
I think the brown is caused by additives to the fuel.

I have also seen that current gasoline additives give the plug a green/brown appearance depending on your gas station of choice.

-D.Idiot
Author:  Rug_Trucker [ Sun Sep 09, 2007 10:16 am ]
Post subject: 
Quote:
I always thought that bown/tan color was what you were looking to see. I think the brown is caused by additives to the fuel.

Sam
Well I guess my question is why brown on 1/2 of the insulator? We are talking split right down the middle.

Half tan/ half brown. I've never seen a plug like that.
Author:  slantzilla [ Sun Sep 09, 2007 7:21 pm ]
Post subject: 
Quote:
Quote:
I always thought that bown/tan color was what you were looking to see. I think the brown is caused by additives to the fuel.

Sam
Well I guess my question is why brown on 1/2 of the insulator? We are talking split right down the middle.

Half tan/ half brown. I've never seen a plug like that.

Half of it is washing out under load. No big deal.
Author:  Rug_Trucker [ Mon Sep 10, 2007 3:38 am ]
Post subject: 
Washing out? Like incomplete combustion?
Author:  LUCKY13 [ Mon Sep 10, 2007 8:19 am ]
Post subject: 
Yes....... But you can help it through tuning. Looking for tan or brown color on a plug to indicate fuel mix is not really the way to guess fuel mixer. My guess is your pig rich & maybe even a weak ignition system to boot.


Wet flow of the /6 head cant be to good. I can only guess what some of these heads work like after porting.



Jess
Author:  Rug_Trucker [ Mon Sep 10, 2007 4:36 pm ]
Post subject: 
What's wrong with my breaker points? :lol:

I wish I could post pics here.
Author:  Joshie225 [ Mon Sep 10, 2007 5:04 pm ]
Post subject: 
You have to upload your pictures to a site like photobucket and link to them here with the Img tag.

Image

My car still has points. Got over 21 MPG at the last fill-up.
Quote:
What's wrong with my breaker points? :lol:

I wish I could post pics here.
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