Spark plug match
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Postmaster
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From: Broken Arrow, OK
All Ford engines used to have 18mm spark plugs. The first I can think of that went to the smaller 14mm plugs was the 429 when they released the CJ and the larger ports required a smaller plug. I don't know why they switched everything else over to the smaller plugs
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From: Lost
Originally Posted by chief2007
So I could buy these plugs (at $24.95 a piece :P ) for a 1989 5.0 and they will fit in my 1989 300? Sounds good to me, I just have to come up with $150 for all 6 of them...
$150 for a set of plugs. They better be able to increase MPG by at least 300%, and last forever, to even be worth the purchase price..........
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I have the link at the top post if you didn't already notice it. I would like to see some hardcore proof before dropping that much money on them. It would be a good investment though judging by what I read about them.
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If your ignition system is healthy and timing ok, coupled with good fuel delivery, then I don't think you are going to see a significant increase in performance and gas mileage with any aftermarket sparkplug change unless your existing plugs are really bad. Afterall if the fuel is all ignited by spark, there is only so much power available.
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From: Broken Arrow, OK
I'm calling BS on those plugs for any kind of real world improvment in anything. The big problem with them is that plugs do not determine how much power goes into the spark. Their site says that a normal plug produces 50W of power and theirs produce 1 million W of power. The plug can only pass on what it is provided. Most performance ignition sysems run on less than 10A at 14V. The most power available is 140W. The plug can't amplify that without an external power source. The second problem is that your engine only needs what it needs. High performance ignition systems don't add anything to an otherwise healthy ignition system in 90% of all applications. What they do accomplish is allowing your system to perform at higher levels after the parts have begun to wear out. A high output ignition might not be worth any power at all when the tuneup parts are new, but when those parts have 30k miles on them it probably helps considerably.
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From: Lost
Originally Posted by Silver Streak
I'm calling BS on those plugs for any kind of real world improvment in anything. The big problem with them is that plugs do not determine how much power goes into the spark. Their site says that a normal plug produces 50W of power and theirs produce 1 million W of power. The plug can only pass on what it is provided. Most performance ignition sysems run on less than 10A at 14V. The most power available is 140W. The plug can't amplify that without an external power source. The second problem is that your engine only needs what it needs. High performance ignition systems don't add anything to an otherwise healthy ignition system in 90% of all applications. What they do accomplish is allowing your system to perform at higher levels after the parts have begun to wear out. A high output ignition might not be worth any power at all when the tuneup parts are new, but when those parts have 30k miles on them it probably helps considerably.