Catch Can
Tuesday, June 3rd, 2008
Positive Crankcase Ventilation and oil issue.
A common practice on many modern engines is the plumbing of PCV (positive crankcase ventilation) lines back into the intake - this is done in accordance with emmissions regulations.
The issue with this is that many engines have this excess air bled from the rocker covers where there is lots of oil flying around, so this excess air becomes heavily contaminated with oil before entering the intake……as you may know oil retards the ignition process and therefore dampens power.