Quote:
Originally Posted by NachtRitter
Would it burn any more oil in DFCO than not? Seems that it'd be the same amount of oil getting sucked in whether fuel is coming in or not... the valves still open the same...
|
Combustion pressure casues the rings to seal the cylinder walls more closely, because the pressure increases the force applied to the cylinder walls by the rings.
This is the same reason you will see a certain amount of blue smoke between gear changes in an engine with significant wear.
DFCO with your foot off the throttle creates highest engine vacuum readings, which combined with no combustion will cause higher amounts of oil to be sucked past the rings and valve seals, as was previously mentioned.
regards
Mech