One thing I haven't seen anyone mention is the imapct marks on the other plugs with intact ground straps. What caused those marks? Is the installed ground strap height the same as the stock NGKs? I would take a stock plug and a Pulstar with intact ground strap and install them in the same hole while taking depth measurements to determine how far they protrude into the chamber. Also how deep is the porcelain before it touches the plug wall for heat transfer compared to the stockers?

 

How about the color of the other plugs?

 

^^the other 3 plugs i posted you mean??

 

You guys are horrible at diagnosing things. There is no way a burned off plug strap can cause the valve to chip like that. The valve may be chipped as you see it but it was from being overheated just like the electrode straps. Nothing hit the valve. Thats just plain poor diagnosis. If something hits the valve the valve stem bends. End of poor comments I hope. Please do some reading on what pre-ignition is and what effect it has on parts in the cylinder. this damage is CLEARLY from pre-ignition. the plugs obviously the wrong heat range.

 

^^so your telling me the porcelian (electrode) melted away during combustion??

 

That thing is melted and odds are all the other valves were exposed to the same temps fatiguing them as well.

 

I truly believe my valve did not melt, i would be able to see it if it was melted there perfectly chips no signs of melted edges, on them but i can be wrong but from my eyes they seem too be legit chips on the valve

 

my thought is the Ground strap melted obviosly, the electrode broke into pieces due to heat fell into my combustion chamber and took out my exhaust valve. Am i making sense or am i way off?!?!?

 

Pulstar is complete and and utter junk. I have seen them melt with less than 10 miles on a 250whp nitrous honda. Just stick to whats proven...NGK or Denso.

 

the insulators look awfully white to me.

 

here are the piston pictures and still need to get those cylinder walls checked out

 

damn look all piston it something hitting... maybe u got wrong size plugs.. also stay away from plustar.. they ruin my friend 350z TT and 98 Supra TT... not worth it.. even modifited magzine plubish their plustar on 350z gain 10+ whp.. so bull****..., plustar is Crappy plugs ever...

stay with NKG copper, NGK IX, Denso IR

plus piston #2 is look oily on piston

 

^^^^all 4 plugs were correct in length... I just hope the walls are alright!

 

one of pistion #1 have small chips on top and possible on wall cyclinder..

so i would suggest and inspect your walls and all piston very well. it possible crack small or hair line cracks..

i wish you good luck build up

 

Evo9"Miss Rose"

Did you clean any of those piston tops before the pics?