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A problem that can occur due to human error is mounting the exhaust manifold backwards on the outlet
valve. This might be done routinely if running an engine in reverse rotation, but if forgotten, and you now
run the engine in normal rotation with the ports in the reverse rotation configuration, you will have loading
issues. Typically, you’ll have to pinch off the water flow tremendously to get a successful acceleration test
pull. You may also experience loading while the engine is idling. This is caused by water being unable to
exhaust from the absorber properly. Here are some photos showing the proper orientation of the exhaust
manifold for standard rotation engines (clockwise):
Figure 7.8 Outlet Manifold
Figure 7.9 Slotted Bolt Hole
Figure 7.8 to the left shows the outlet manifold
installed correctly for normal operation. The left side
of the photo is towards the engine, the right side of
the photo is towards the rear of the dyno stand.
Figure 7.9 to the right shows the slotted bolt hole
on the manifold towards the front or engine side of
the dyno. This would be correct orientation of the
manifold for normal operation (clockwise engine
rotation).
7.0 Troubleshooting