2nd Generation Specific 1986-1992 Discussion

Spark Plugs

Old 05-13-2004, 02:11 AM
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OK Im to lazy and Its late out and dark, so Im not gonna go and look to see. How many spark plugs does a 7 use, because I went to auto zone and the only spark plugs they had were the denso Iridium, it was like 39.99 for them and I dunno how many it came with. I herd NGK made some for rx7's, anywhere online where I can get them cheap?
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Old 05-13-2004, 02:22 AM
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2 leading

2 trailing

4 total

use ngk, bur7eq for leading, and bur9eq for trailing, i think... it's gonna be like 50 bones for all of them..
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Old 05-13-2004, 02:26 AM
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thanks Bigturbo74 , is the top leading and the bottoms ones trailing, which are which.
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Old 05-13-2004, 02:32 AM
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I can get them from O'Reilly for like $24 for all 4, tax and all, and the Trailing is the Top, Leading is the Bottom
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Old 05-13-2004, 02:34 AM
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^ thanks alot, im get me some spark plugs tom then.
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Old 05-13-2004, 08:35 AM
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Originally Posted by drunkin_idiot' date='May 13 2004, 02:26 AM
thanks Bigturbo74 , is the top leading and the bottoms ones trailing, which are which.
T = Top = Trailing



L = Lower = Leading



You can get them cheaper than that. 4 Plugs should run you about $30. Do you Have a Discount Auto Parts or Advance Auto Parts near you??



Mazdatrix has them for $7.68 each.



http://www.mazdatrix.com/ign-2.htm
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Old 05-13-2004, 09:45 AM
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One of the Advance Auto Parts stores in Richmond had the NGK's for 4.99 each. You won't find them everywhere, though. That was last year, too.
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Old 05-13-2004, 01:19 PM
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I have heard you can run 4 Leading plugs. Since the trailing don't burn as hot?



Anyways, I got them at Napa Auto Parts for about 31 bucks. Just make some calls. Don't **** up the coils. Next thing you know detonation, kaboom and a bunch of money into your engine.
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Old 05-13-2004, 01:28 PM
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Good reading compliments of Mazdatrix's website, colder isnt always better, I just learned a think or 2 here myself:



A common misconception of many people are the terms "Hot" spark plug, and "Cold" spark plug. The temperature rating of the plug refers to the running temperature of the physical spark plug - i.e. a "Hot" plug will retain more of the combustion heat in the plug itself, meaning not transfer the heat to the engine itself. This is why a "Hot" plug is needed for slower city type driving so the carbon deposits will be burned off the plug, and clean firing will still be possible even when combustion temps are low (idling, stop & go etc.). At the same time a "Hot" plug used in a highly modified engine that is driven hard consistently (racing) will simply retain too much of the extra combustion temperature and burn itself up (usually cracking the porcelain, and potentially doing major engine damage).





A spark plug that is too "Cold" for the engine/application will start harder, foul much easier, and generally be a pain to work with.



For engines that are not significantly modified for racing, we have had very good luck just running the stock plugs. For street ported engines driven hard on the street, the most we have had to do is move one or two heat ranges colder. This lack of change is because the engine is still driven at normal speeds and loads for 99% of the time.





Racing engines, for the most part, are above 7000rpm 100% of the time - these are the ones that require the colder plugs. Quite often a set of "hotter" plugs must be used to get the engine started and warmed-up, because the race plugs will not fire consistently below 4000rpm.



Spark plug choice, for any given engine, can then be stated as "Hot" enough to fire consistently at the lowest RPM and load normally needed (without fouling), and not overheat (and burn-up) at the highest RPM/load for the given application. This translates to : The "Hotter" the engine (modifications, load, usage, etc.) the "Colder" the spark plug needed.
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Old 05-13-2004, 01:49 PM
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Dang thats insane, i can find ngks for 4 bucks a pop everywhere here.
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