Quote:
Originally Posted by aagun
what is the secret on avcs? this is high technology knoledge on engine operation . on ur map there are 44° of overlap duration at uncontrollable area 4K rpm. that's mean in FA20 that the intake and exhaust cams opened 2mm at same time. in that error will push the air from intake to exhaust Directly without burn it . that air is full charge of fuel . (thats why it coz jumping afr to rich at that dip)
this is first reason .
2nd season there is low exhaust back pressure on aftermarket headers .
the 3rd is timing advance . it makes intake vacuum
4rd is where is the top of overlap
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How can I calculate the overlap from the two tables? And wouldn't it be on purpose that the intake and exhaust valves are open at the same time to help scavanging?