Variable valve timming

["Daniel Brideau" <dan@hobbyetc.com>]

When I put new timing belt on my 16V, I managed to install it "a tooth off".
This happened, because I aligned the timing marks with the tensioner set in the
loose position.

Tightening the tensioner moved the timing, quite a lot.  The power difference
was considerable.

This got me thinking, how difficult would it be to make a tensioner assembly
that could move?  If two tensioning cam-pulley things were mounted to a sliding
plate, you could manage the cam timing 'on the fly'.


My specific question to you guys is: how much force would be required to move
the timing while the engine is at full speed?  I think quite a lot, but haven't
taken the time to study the dynamics involved.  Some sort of vacuum or
oil-pressure controlled servo would be needed, or perhaps an electric motor
driven actuator.


Any thoughts?

Dan Brideau
http://www.type53.com/




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