http://www.jaxracing.com/lswon/fuddupplug.jpg

Well, #1, #2, and #8 cylinders are showing 20%, 24%, and 20% leakdown respectively. The rest are between 2% and 4%. It should be anywhere less than 5%. The intake is off and the heads are on their way to being off. Guess its time to see whats been making that tapping noise. Oh boy, I really wasn't looking forward to this.

The electrode isnt melted, its actually broken off. If you look at it closely as we did, you can see the jagged edge where it broke. Its doesnt appear to be melted, but I bet the piston rings are. I figure my front 2 cyls are the leanest but damn, not that lean. I still dont know about #8. It may just be wacked out for other reasons.

I was only running a 100 shot dry with my current setup. I just dont know why it would do somthing like this. Oh well. We'll see the rest of the damage tomorrow night.

Dan

 

is the porcelin cracked any? Mine did that when I blew up on the dyno. but my straps were phyically melted off...

 

Nope, the porcelain is perfect on all plugs. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

 

Recently had the same problem with my #2 cylinder. I broke a chunk of the piston off and it mashed up the plug pretty bad. I was on the juice too. Good luck!!

 

A piece of metal in the combustion chamber can break off an electrode. A piece of valve to be more specific.

 

Well, i got that head off last night and didnt find any stray pieces of metal. The cylinder wall looks good but the chamber is really dark and I figure the rings are going south. I havent got the passenger head off cause the header is still in the way. I'll report back more later.

 

I just pulled out a plug that looked axactly like that, electrode melted off(N20), but the ceramic was broken and half gone <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

 

Couldn't detonation cause that?

 

is it possible to do that to a plug and the piston and rings, etc... be ok?