What is a timing chain phaser?
A “cam phaser” is just an adjustable camshaft sprocket that can be turned by means of a computer-controled servo. Rather than just setting a certain amount of advance or retard, the computer can advance the cam or cams at low rpm to enhance driveability, and retard the cam or cams at high rpm for more horsepower.
How does oil pressure affect intake cam timing?
Oil pressure from the oil pump goes into a solenoid valve on the engine block. This valve controls the oil pressure that reaches the cam phaser. The cam phaser is the adjusting mechanism which controls intake cam timing. The cam timing changes depending on the oil pressure inside the cam phaser.
What does variable cam timing on intake cams mean?
The first generation of Prince (THP) engines features variable cam timing on the intake cam. This means that it can be advanced or retarded based on what is requested by the ECU calibration software. Newer engines like THP200 feature variable cam timing on both cams. Oil pressure from the oil pump goes into a solenoid valve on the engine block.
What does variable cam timing on thp200 mean?
This means that it can be advanced or retarded based on what is requested by the ECU calibration software. Newer engines like THP200 feature variable cam timing on both cams. Oil pressure from the oil pump goes into a solenoid valve on the engine block. This valve controls the oil pressure that reaches the cam phaser.
How does a VVT change intake and exhaust timing?
On SOHC and pushrod engines that have VVT, the same cam operates both the intake and exhaust valves, so advancing or retarding the cam simultaneously changes both the intake and exhaust timing. Volkswagen camphaser: The rotor inside the cam phaser changes position when oil pressure is routed into the chambers.
How does the phaser control the valve timing?
The phasers use directed oil pressure to manipulate camshaft position relative to the sprocket and therefore vary valve timing. Notice there is a spring on the exhaust cam phaser.
How do you get to the camshaft phasers?
To gain access to the camshaft phasers, various engine accessories must first be removed. This is actually the most time consuming part of the whole project because of the amount of intake plumbing, wiring, and vacuum lines stopping you from getting to the valve covers and cam chains. Disconnect and remove the intake tube.
On SOHC and pushrod engines that have VVT, the same cam operates both the intake and exhaust valves, so advancing or retarding the cam simultaneously changes both the intake and exhaust timing. Volkswagen camphaser: The rotor inside the cam phaser changes position when oil pressure is routed into the chambers.
How does a variable valve timing engine work?
Notice there is a spring on the exhaust cam phaser. Variable valve timing (VVT) engines have become rather common in the last decade. Different versions of VVT technology exist, but the version this article will focus on is using a phaser to manipulate camshaft position and, therefore, valve timing.