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I was going to order a set of plugs for the POS on the Mazdaspeed fast moving catalog they show two different part numbers for a '92.
BP03-18-110 - BKR6E-11, STD
BP01-18-110 - BKR5E-11, Hot Type
So what would be the advantage or disadvantage of the Hot Type??
http://www.ngksparkplugs.com/images/...ngflowpath.gif
I found this on NGK's Website.
never mind
I did they are both $3.00 each! :shock:Quote:
Originally Posted by onething
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Originally Posted by horse
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Originally Posted by horse
That pretty much covers it! :shock:Quote:
Originally Posted by from NGK
Where can I get professional guidance?Quote:
Originally Posted by POS Racing
There are pros here?Quote:
Originally Posted by brock
This is great?
The red/black MIATA got magnacore 8.5 wires and 6E done thsi week. one more thing to through into the mix on sunday. The old plugs were 5E and Blue ngk wires, plugs were very Black
Hummmmm?
The difference in the plugs is quite simple.
The lower the number, the LONGER the distance between the tip of the center electrode and the base of the ceramic insulator.
Contact between the ceramic insulator and the steel body of the plug causes heat to be conducted away from the tip and out to the head where the heat can be removed by the cooling system.
What we're really looking at here is: How hot do you want the tip to stay during normal running conditions.
Let's say that you lived in Toronto and you only use the Miata for commuting in heavy traffic. Lots of low engine speeds and moderate acceleration. If you pulled the plugs after 5k miles, you'd have black sooty plugs that might tend to misfire. In this case, you might want to go from a "6" all the way down to a "4" so that the tip stays hot enough to burn off carbon deposits.
Conversely, if it's an open track car only, with heavy accleration and lots of high rpm use, you might find that the "6" induces a bit of preignition after the 2nd or 3rd lap. Pulling the plugs might show some signs of plug overheating and damage because the tip is getting (and staying) too hot under these conditions. Thus, you might want to go up to an "8".
Does that make sense?
One of my motorcycle race engines ran a CR of about 13.5 to 1. We constantly ran it between 9,000 and 12.500 rpm. We had to go up 4 steps on the plugs before it stopped melting them.
I hope this was the answer you were looking for.