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<blockquote data-quote="lemosley01" data-source="post: 1810003" data-attributes="member: 17775"><p>The oil mist question has already been addressed a couple pages back.</p><p></p><p>For cars using forced-induction (no Nitrous), breathers appear to be a good idea, even necessary. </p><p></p><p>Some pretty good arguments against the PCV system have been made:</p><p>1) It sucks oil into the intake tract and deposits it in the lower intake</p><p>2) It becomes part of the A/F mixture thereby lowering the octane of the charge and increasing your chances for detonation. The question is, how much does it lower the octane rating. In reality, it can't be pulling in that much oil or our cars would eat the stuff quarts at a time (my car does not burn oil). </p><p> a) I would think that Ford would have accounted for this. If so, perhaps you can increase your timing slightly more by using breathers instead of the PCV?</p><p>3) It pulls hot air from the crankcase into the TB and raises the temperature of the air charge. This could be significant because the crankcase is going to be fairly hot. The air charge on an N/A engine should not be all that hot when it enters the intake - how much does the PCV system raise? Enough to be significant?</p><p></p><p>Arguments for keeping the PCV:</p><p> 1) Oil misting on the engine (addressed already in that it doesn't happen and there are fixes for it if it does)</p><p> 2) The engine was designed that way and therefore it must need them (the engine was also designed with water pump, crank, and alternator pulleys of a certain diameter and how many of us have replaced with different size pulleys).</p><p> 3) You need it to evacuate the blowby gasses from the crankcase or risk sludging up your engine and contaminating the oil (thereby reducing the service life of the engine). </p><p> a) How much will NOT evacuating the gases reduce the engine life by? 10s of miles, 100's of miles, 1000s? </p><p> b) Do breathers allow this evacuation to occur in significant quantities compared to the PCV?</p></blockquote><p></p>
[QUOTE="lemosley01, post: 1810003, member: 17775"] The oil mist question has already been addressed a couple pages back. For cars using forced-induction (no Nitrous), breathers appear to be a good idea, even necessary. Some pretty good arguments against the PCV system have been made: 1) It sucks oil into the intake tract and deposits it in the lower intake 2) It becomes part of the A/F mixture thereby lowering the octane of the charge and increasing your chances for detonation. The question is, how much does it lower the octane rating. In reality, it can't be pulling in that much oil or our cars would eat the stuff quarts at a time (my car does not burn oil). a) I would think that Ford would have accounted for this. If so, perhaps you can increase your timing slightly more by using breathers instead of the PCV? 3) It pulls hot air from the crankcase into the TB and raises the temperature of the air charge. This could be significant because the crankcase is going to be fairly hot. The air charge on an N/A engine should not be all that hot when it enters the intake - how much does the PCV system raise? Enough to be significant? Arguments for keeping the PCV: 1) Oil misting on the engine (addressed already in that it doesn't happen and there are fixes for it if it does) 2) The engine was designed that way and therefore it must need them (the engine was also designed with water pump, crank, and alternator pulleys of a certain diameter and how many of us have replaced with different size pulleys). 3) You need it to evacuate the blowby gasses from the crankcase or risk sludging up your engine and contaminating the oil (thereby reducing the service life of the engine). a) How much will NOT evacuating the gases reduce the engine life by? 10s of miles, 100's of miles, 1000s? b) Do breathers allow this evacuation to occur in significant quantities compared to the PCV? [/QUOTE]
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