Quote:
Originally Posted by DJCarbine
Found this, its got some more technical explainations
http://www.purcellperformance.com/Te...13%20FR-S).pdf
Specifically this passage
Sounds like its still hydraulically controlled with the addition of a detent for "locking"
There is actually a lot of good info in there if it is indeed accurate |
Just found this thread today, and lots of good info here. I just wanted to clarify that while cam actuation is controlled by oil pressure, it is initiated by valve spring pressure. The spool valve controls the ability of oil to flow into and between the advance and retard chambers, but the oil is only there to hydraulically lock the cam adjuster.
From the Subaru Chain Driven Engines TRB:
Quote:
The new system does not depend on a hydraulic rotor to function. Instead oil is moved from
one chamber to the other which reduces the volume of oil needed to operate the AVCS.
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and
Quote:
A spool valve pressed into the Camshaft rotor controls the oil flow into and out of the Advance
and Retard chambers. The force needed to rotate the Camshaft within the Camshaft sprocket
is delivered by the valve springs.
The oil in the sealed chambers holds the Camshaft rotor into a fixed position. If oil is transferred
from one chamber to the other, the Camshaft rotor and Camshaft rotate within the Camshaft
sprocket.
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Subaru's service info is generally not well organized. Looking for info on the function of this system in the actual online service manual turns up information on how the EJ AVCS works, so...