Welcome to Ford40.com (or Ford 4L or Ford 4.0, whatever you want to call it.) I've been driving a 4.0 V6 OHV equipped Ranger for 10 years now and am very surprised at how little info there is on the net for this engine/vehicle combination. So I put up this site to let others know what I've learned. In those 10 years, I've also made some mods to my Ranger that would be good for any Ranger, Explorer or SportTrac with the 4L V6 engine, and I've included them as well.
Common problems and solutions:
I bought the PVC fittings here.
I bought some flex PVC pipe here.
I bought my clone golf clubs here.
I bought the headers & MAS here.
I bought my truck tires here.
What I believe & why:
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Why CAI (Cold Air Intakes) work:
Everyone knows, you get 1% horsepower change per 11 degrees Fahrenheit temperature change of the intake air. Thus, if you raise the air temps by just 55F, you lose about 5% HP due to a less dense air charge. So keeping a "cold air" system is absolutely critical. In fact I think the under hood temperature difference is way more than 55F. The factory thermostat has a 212F setting and that means that all the air coming through the radiator is at least that hot. Add to it the radiant heat from the engine and headers (or exhaust manifolds) and you can see it could be as much as a 100F difference, which would be a 9% loss in HP. So there is no way I'd ever use one of those cone filters which draws air from inside the engine bay. That's why I did the air box modification.
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