Maxim_X

I found the number 3922 for one step colder. But, does anyone have the # for 2 step colder autolites in copper?

2K5SS/SC?

Autolites are ca ca. NGK is what you really want.

Maxim_X

Well... I can't get any NGK's in 2 steps colder by Saturday. I can order them and even then they are the iridium ones.

I'd really prefer some copper plugs and I know autolites can be found localy.

3921 sound right? anyone running it?

silver187666

advanced discount auto should have it next day

ShortStack

I run the 3922..

Ive been told that the stock ss/sc plugs are already "one step colder" plugs... so going one step down (3923 to 3922) is technically 2 steps colder already. Hungryhip explained this to me.

Maxim_X

You have any problems with burst knock?

What kind of boost are you running??

During some recent tuning of mine. I can't seem to run any kind of aggressive timing that I should be able to run with the meth. I'm on bkr7e's and I think they are too hot for my setup, causing burst knock in the top of third.

ShortStack

Im not really sure.. but i dont think i have any problems so far with anything. But i guess im not really sure what im looking for...

18-21psi.

2K5SS/SC?

Look up NGK parts numbers as follows at the local parts store and you might have better luck finding them. You may also need to go to a couple different ones as well. A good tuner will always venture a bit out of the way to find tune up parts locally. Advanced auto parts usually has them, but you have to use these stock numbers.

NGK BKR7E copper v-power: 4644
NGK BKR8E copper v-power: 6097

Gap them to .032-.035 and you should be set. Since they are $2/plug, I would suggest changing them every oil change or every other. I truely do think that the 4644's gapped at .035 will more than do the trick for you though.

Maxim_X

Well I've been running the BKR7e's gapped at .28 and I see a burst knock that I can't explain except maybe that the plugs are too hot for my setup.

You can't forget I'm running WAY more boost than I should. IDK what it is exactly because I don't have boost on my hp config. But, if I did the math right it's over 24psi.

I think I located some NGK bkr8e's though. Thanks for the part numbers!

ShortStack

Maxim.. have you ever gotten a REALLY loud valvetrain?

Maxim_X

Not in the Cobalt. Why?

ShortStack

I was just having some personal issues.. just wondering if you had any insight..

let me know about the ngks you got.. ive been using autolite, havent seen any problems althought i might jut wanna give em a shot.

2K5SS/SC?

At that PSI range I can definitely see the 8's then. You might be getting some blow out with that sort of airflow. The MAF might be maxed out as well. No problem on the part numbers. I'm willing to help anyone that is actually posting something that interests me now a days.

SlowLSJ

i run autolight 103... 26 degress of timing no knock, no blow out no smoke, idk though not every motor is the same haha

ShortStack

autlite 103 = two step colder?

and for the ngk.. is the higher the number (8e instead of 7e) colder?

2K5SS/SC?

Yes, 8 is colder than 7.