Adjustable Cam Timing

[Dave Balfour]

you  can purchase off set chain wheels for many engines 

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| From: Frederic Breitwieser
<frederic.breitwieser at xephic.dynip.com>
| To: diy_efi at coulomb.eng.ohio-state.edu
| Subject: Adjustable Cam Timing
| Date: Friday, March 27, 1998 2:53 PM
| 
| >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