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When that cylinder is not operating, the engine speed should drop.
The drop in engine speed is recorded and compared to the drop
when other cylinders are eliminated.
If all cylinders in an engine produce the same amount of power,
the drop in engine speed is equal for all engine speeds in the
cylinder power balance test. If one cylinder does not contribute
much to the total power output of the engine, then the speed drop
for that cylinder will be more than the speed drop for the other
cylinders during the power balance test. When an engine is
running poorly, it is usually caused by one or more cylinders not
producing as much power as the other cylinders.
A cylinder power balance test can identify cylinders with low
productivity. Ignition or fuel is disabled for each cylinder and a
drop in RPM is recorded at a specific speed (800-1000RPM).
The engine analyzer does the same thing as this manual cylinder
power balance test. It tests each cylinder and compares the
results. When the analyzer is not available, the technician can
disconnect the plug bushing from its corresponding spark plug or
distributor connection long enough to disable the desired cylinder.
Please note that the RPM will drop when that cylinder is disabled.
If the drop in one cylinder is not consistent with the other cylinders,
this is an indication of a problem with that cylinder.
This feature is suitable for power balancing when replacing or
repairing cylinders.
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