Question about 1994 Nissan Altima
If you are referring smaller air outlet on the cam cover of the engine, it would not add HP. You can add a little HP by making the engine "breathe" better by having better air filters like the washable cone type ones found in car shops. Another is by ensuring you are getting cold air. Others would put covers on one side of the air filter so the warm air from the engine will not go back to the engine. Other extreme ways are getting a cold air intake and adding turbo but may need further modification and tuning to make it efficient.
Posted on Jul 16, 2009
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Posted on Jan 02, 2017
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If you mean the crankcase breather filter, I've looked into this, but I haven't found any reference to this existing on a 1994 Taurus (at least with a with a 3.8L engine), except for some online parts companies that list it for the
1994, but either they're wrong, or if there were 1994 Tauruses that have a
breather filter, I suspect it's for an engine other than the 3.8L. It's used on earlier Taurus models, but
only up to 1991. Some people say
the PCV valve performs the function of the earlier breather filter, but I don't
see how, since the PCV valve just opens and closes, and does no filtering once
it's open. On one web page where breather filters
are discussed (http://www.taurusclub.com/forum/82-maintenance-repair/79542-bad-pcv-valve.html),
it's said that adding one to an engine that didn't come with one, doesn't help
increase horsepower or mileage, and can bring in air that's not metered by the
MAF, which can actually reduce horsepower and mileage.
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