Doc Holiday wrote:Here is a plug from my engine after a nitrous pass. Let me see if I have this right. Where the brown ends on the ground strap is my heat mark, correct?
This is where you start watching closely what you're doing, yes it might be able to take 1 or two degrees more, however I'm not all that familar with those plugs or that type of engine. I don't think I would put much more in it from where you're at. Maybe try 1 more and see how the car performs. Most people recommend stopping at the curve on the ground strap (in reference to the plugs in the earlier pictures). Some will chase it a bit more past the curve if the car responds to it, but got to remember you're on the upper end of how much timing you should be running at that point. If you see black specks show up, take timing back out.Doc Holiday wrote:So, since its so high on the strap, that means I should try to add a couple degrees of timing, right? I'm shooting for the heat mark to be about where the strap meets the base if I understand correctly.
Doc Holiday wrote: I'm not sure how to tell if the plug looks lean or not though. My thoughts is that it looks good, but I'd thought I'd throw this picture on here to get a second opinion. This is using C16 gas. Whats the verdict? How do I know if the plug is too cold or too hot?
Beyond wrote:Nothing personal but your pictures kinda suck. I can't see real well what's going on there. The soot on the porcelain I can see, I'm guessing these plugs were some you drove around on then made some nitrous passes with?
If so it almost looks like those areas were shielded from the heat a little by the electrode and didn't get hot enough to burn off the carbon. Notice how they look like a shadow of the electrode... Kinda interesting actually if you think of the heat in the combustion chamber radiating out like light would. The timing mark on the strap looks pretty good.
Anyway, that's my take on it. I'd suggest starting out next time with fresh plugs with no driving on them, then pull them after a pass and take pics.
Beyond wrote:Did you make a motor pass first before the nitrous pass or something? Surely those pictures aren't from a plug that only made one nitrous pass and were fresh at the start of the pass were they?
You might try taking your pictures outside in the sun or with a flash next time, that might help.
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