so i pulled all my plugs with my motor today and found that my rear driver side plug was melted. all the other plugs looked brand new. this was on a bolt on LO3 that has run as much as a 150 shot and a consistent 125 shot of nitrous. the ngk plugs are 2 step colder plugs. basically im just curious on what im going to find in that cylinder when i pull the head tomorrow. anybody wanna guess? heres some pictures of the plug sorry about quality its from my phone.

 

Wow, that cylinder was waaaaay lean. I'm betting the piston is going to look fugly!

 

dude your plug is weaksauce.



you wanna hear some poz stories?

edit: 50+ bottles of 150 shot 170k mile 305 still going strong.

and mine setup looks cooler than yours.

 

One thing from the get-go here: DON'T use projected-nose spark plugs with nitrous or boosted applications. WAY too easy to overheat the tip and side electrode under WOT conditions on squeeze/spray. Colder doesn't help if the heat can't get down the side or center electrode fast enough. The result is detonation- yes, bad choice of plug can CAUSE detonation, even pre-ignition, even if the heat range is plenty cold. Standard non-projected nose plugs a couple ranges colder than stock and gapped around .035 are what you want. 'Nuf said on that subject.

Other than that, it looks like you ran it lean and/or got too aggressive with the spark advance. End/back cylinders on a SBC are usually the first ones to go lean. Your pistons will be the next to take the abuse. Back your spark down a few degrees and make absolutely certain your fuel pump is keeping up throughout the entire quarter mile run (no fuel pressure "slumping" in the higher RPMs).

 

my nitrous solenoid stuck open.

literally EVEYRONE uses the ngk tr6s as a nitrous plug.

at about 105 mph, my stock tbi pump (170k miles) would drop about half a psi while spraying. timing was at 3* advanced on the 150 shot too. never had any trouble with it.

 

turbo pics just for the hell of it.

 

im going to replace these plugs with the tr-6s everyone has success using. also this was the only one that went bad all the other plugs looked like they should for a good running motor. i did have the stock tbi fuel pump running over a 150 shot so maybe it ran out of fuel at higher rpms or something. also i ran a 125 at stock 0 degrees of timing. im still just afraid as to what ill see when i pull the head on that side tomorrow.

 

why are you pulling the head? did you NOT see my plug with a pool of molten metal where the g/s used to be? i sprayed 10 more bottles through the car before i took everything out for the turbo 350 swap.

 

If you don't want to pull the head you could always do a compression test and that'll tell you where you're at for sure.

 

OR he could just quit bein a sissy and run its ***** off and not worry about it.

 

no i just didnt want to pull the head because i didnt wanna see any damage if any. but i pulled the heads today and everything was mint and clean in there man are 305 ****in champs. new gaskets, cam, head porting and shell be better than new.

 

dont suppose you looked at the rings.... cuz you know.. they go before the pistons in this situation....


oh btw more turbo pictures.