Quote:
Originally Posted by ps2cho
So the F8DC4 run one notch "colder" than the H9DC0's...Under what conditions are colder/hotter sparks favorable?
Also, can you explain the last # in the part number (Special Shell or Electrode)?
Just trying to understand which would be best for me as it looks like this spark plug has a lot of sources compared to the H9DC0
I switched from the H9DCO's which were fouled to new Denso non resistor and I cannot be 100% sure, but I feel like it seems to be idling a tad
rougher...That is why I want to get a spare set of Bosch plugs to test it out as the old ones I had were fouled up from past leaking stem seals.
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I cant speak directly to the conditions for hot/cold sparking, however this article from NGK might shed some light on it for you
http://www.ngksparkplugs.com/tech_support/spark_plugs/p2.asp
I also found another Bosch Decoder:
http://imgur.com/Lyy6S.png
So H9DC0 vs F8DC4
The 0 and 4 in the end seem to be:
4 seems to have an extended insulator nose
0 just says "deviations from basic version"
So I take that the 0's were the basic version and anything above that is an "enhanced version" which whatever the number corresponds to...
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