SoundTraxx Tsunami Installation - Manual (Page 22)

Tsunami Installation Guide Page 19 Tsunami Installation Guide Page 19
Step 7. Install the Cam
(Optional, Steam Only)
If you are intending to synchronize the steam exhaust chuff using a
mechanical cam switch, you have a little more work to do. Otherwise, if you
are planning to use the Tsunami’s Auto-Exhaust feature, you may skip this
step.
SoundTraxx offers its P.N. 810038 Exhaust Cam Kit as an easy to install
alternative to traditional axle mounted sound cams. The Exhaust Cam
set provides nine different synchronizer disks of varying diameters and
configurations. Installation is straightforward and unlike the traditional sound
cam, has the advantage that the drive wheel does not need to be removed
from the axle.
Begin by selecting the synchronizer disk pattern appropriate for your engine:
2-Cylinder Steam Locomotives
In all conventional 2-cylinder steam engines,
use a synchronizer disk with 4 foil segments.
You can achieve the proper prototypical exhaust
chuff timing by aligning the foil strips of the
synchronizing disks to the crank pin on the driver
wheel.
Articulated Steam Locomotives
Articulated engines come in two flavors, simple
and compound. On simple articulated engines,
the cylinders on the front and rear are the same
size. On compound engines, one set of cylinders
is considerably larger than the second set.
For compound articulated engines, 4 chuffs per
driver revolution is correct. Install the same as for
regular locomotives.
For simple articulated engines, a synchronizer
disk is available that provides 8 chuffs per driver
revolution.
Geared Locomotives
Geared engines require a larger number of
chuffs due to multiple cylinders and gearing of
the drive wheels. Due to the large number of
contacts required for each wheel revolution, it is
usually impractical to achieve the prototypically
correct number of exhaust chuffs per revolution.
The Shay disk (supplied with the Exhaust Cam set) will provide a
reasonable compromise. Optionally, you may elect to use the Auto-
Exhaust feature.
Installation