Charosenz
Member
- First Name
- Charlie
- Joined
- Jun 12, 2019
- Threads
- 4
- Messages
- 14
- Reaction score
- 2
- Location
- Longview, Washington
- Vehicle(s)
- 2016 Civic Type R
- Thread starter
- #1
I understand that VTC varies cam degrees (phasing) by way of varying the oil pressure that goes to the cam gear by movement of the spool valve. In other words, I understand that when the VTC spool valve is energized it moves so the oil is routed to the oil passage that puts pressure on the cam gear to rotate and advance the timing of the gear.
The part that I don't understand is how it varies the oil pressure to the cam gear, since the spool valve is either "on" or "off". (I would think that the cam gear would simply go from zero degrees when the spool valve is not energized to be fully advanced when the oil control valve receives power, but I don't believe this is true, as I know the cam gear can be advanced anywhere in between zero to the limit (25-30 degrees).
Is the spool valve is pulsed quickly (on and off several times a second) to cause a variation in the pressure of the oil that feeds the cam gear?
Or is there some other mechanism that varies the oil pressure that the cam gear receives which causes the incremental rotation that the ECU desires?
The part that I don't understand is how it varies the oil pressure to the cam gear, since the spool valve is either "on" or "off". (I would think that the cam gear would simply go from zero degrees when the spool valve is not energized to be fully advanced when the oil control valve receives power, but I don't believe this is true, as I know the cam gear can be advanced anywhere in between zero to the limit (25-30 degrees).
Is the spool valve is pulsed quickly (on and off several times a second) to cause a variation in the pressure of the oil that feeds the cam gear?
Or is there some other mechanism that varies the oil pressure that the cam gear receives which causes the incremental rotation that the ECU desires?
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