Spark plugs

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JAMMAN
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Spark plugs

Post by JAMMAN »

Naturally aspirated 5.0 from a 97 mountaineer, no EGR, headers so only 2 mods.

Has autolite AP104's in it now, they look like they have been replaced recently.

Is there another plug that you recommend?
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cgrey8
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Re: Spark plugs

Post by cgrey8 »

Autolite 768s are the typical copper plug for GT40p equipped Explorers (according to Autozone's website). However if you are looking to go to a slightly cooler plug, that would be an Autolite 103. Although unless you are high compression or boosted, you likely don't need cooler plugs.

I dont know what Autolite 104s are.

I used to use Bosch platinums but I've had 3 of them go bad on me with less than 50k. So I've sworn them off and now just use copper cheapo plugs. The only other plug I've ever had that was bad was a Champion I put in the old v6...and it was bad out of the box...cracked porcelain. My guess is it was probably dropped.
...Always Somethin'

89 Ranger Supercab, 331, ported GT40p heads w/1.6RRs, Crane Powermax 2020 cam, ported Explorer lower, FMS Explorer (GT40p) headers, aftermarket T5 'Z-Spec', 8.8" rear w/3.27s, Powertrax Locker, A9L w/Moates QuarterHorse, Innovate LC-1, James Duff traction bars, iDelta DC Fan controller

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MalcolmV8
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Re: Spark plugs

Post by MalcolmV8 »

I always go with copper plugs on projects, hot rods or any sort of toy car. They're cheap to replace and I like pulling plugs to read what the engine's doing when tinkering.
92 302 Ranger - sold
94 302 Ranger AWD - sold
07 BMW 335xi - tuned, boost turned up, E85 - sold
04 911 TT - to many mods to list. Over 600 All Wheel HP on pump gas - sold
2015 Coyote - daily driver
03 Cobra - 2.3 TVS on a built 12:1 CR motor with ported heads, cams, long tubes etc.
MD Racing Lean Protection Module
E85

Tuned by MD Racing

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