Join Date: Jun 2001
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Re: TFI Upgrade from Cape Conversions
While I am by far not an electrical or ignition genius, I can tell you from experience that Splitfire plugs are worthless in a stock application. I'd stick with a basic copper plug, such as an Autolite or Champion. Platinum plugs are about as far as I would go. I ran just about every type of plug available on the market, and when I ran the Champions it ran the best.
As far as the gap goes, who told you that gapping your plugs to .045 would "blow a hole in your pistons"? Pistons get holes like this from an overly lean condition or timing that is too far advanced. Overgapping your plugs will either cause 1.) near complete combustion of fuel (ideal) or 2.) a no-fire condition (which would be rich since the fuel is not being burned at all in the combustion chamber). The recommendation for the TFI upgrade is .045, unless your Jeep doesn't "like" it. There are some here who only run .035 on their plugs with the TFI setup, but only because their engine doesn't perform well for one reason or another with a larger plug gap.
And BTW, in case you haven't performed the "Cape Conversions" upgrade yet, do a search here for "team rush upgrade". It's the same thing you get from CC, except you buy the parts (from a Ford application) at your local parts store and save some $$$.