Adjustable Cam Timing

[Frederic Breitwieser]

>Never thought about the economics of this, low fuel consuption is quite
>important when I am off boost, I want a nice run around motor, buzz to

There is a solution to this - and a friend of mine and I tried to make this
work, but we struggled with the mechanicals of it.

You add several chain links to your timing gearset.  Then, taking two
additional smaller gears, you pinch the timing chain, so there are now four
gears involved.  The two smaller gears are fixed in relationship to each
other, and on a sliding mechanism, they can slide left and right, thus
shortening/lengthening different sides of the timing change. In one
position, your camshaft is dead-on.  In the other position, the camshaft is
advanced a certain amount of degrees.  By adjusting this on the fly using a
hydraulic cylinder as a movement mechanism, the adjustability is very
flexible.  We skipped the hydraulic unit and used a large metal bar, with a
long worm screw in it, which we adjusted using a wrench.

Lower RPMs its advanced, higher RPMs its neutral.

It was a great idea, however we wiped two cams in the process and decided
to bail on the idea for the time being, which has now become about 2 years.


Frederic Breitwieser
Bridgeport, CT 06606

Homebrew Automotive Website:
http://www.xephic.dynip.com/

1993 Supercharged Lincoln Continental
1989 HMMWV
2000 Buick-Powered Mid-Engined Sports Car