Plug reading

[2Luke2]

So just pulled my plugs to do a compression test and I wanted some thoughts on what I saw. It seems like the further back they get the more black they are, but the 1 and 4 are pretty white. I'm guessing 2 is white too, but I didn't take it out because I loosen the motor mounts and raise the engine to get a socket on it. So I'm not sure how I can get it off. Maybe an angled boxend wrench, but I don't have any of those yet. When I do get it out I will be looking for a shorter plug that's for sure!

[Kern Dog]

I remember being told that reading plugs to determine the proper air/fuel ratio needs to be done IMMEDIATELY after a WOT run while the engine is still hot.
Forget that stuff! I have 2" headers and limited clearance, I'm not burning my hands to do that.

If your plug reading was for the purposes of trying to detect detonation, I think you would be looking for speckles on the porceline.

[Bobs69]

I was told that once before too.  I reminded the man that it's hot, and asked if I was suppose to wear welding gloves.  I think his response was along the lines of do what you got to do.

[jlatessa]

When are the header manufacturers going to put O2
sensor bungs near the ports to help us optimally tune our engines.

You'd think they would see the sales potential??

Joe

[firefighter3931]

I remember being told that reading plugs to determine the proper air/fuel ratio needs to be done IMMEDIATELY after a WOT run while the engine is still hot.

That is what you want to do for WOT jetting but you can get a primary jetting plug reading by simply staying out of the secondaries and doing a plug reading after a 15-20 minute cruise. 

Luke ;

-heat range is perfect...the 6 series plug is the "right" heat range. Your 8's were too cold
-primary jetting is a bit rich....try 2 sizes smaller and take it out for a cruise and stay out of the secondaries.


Ron