Regular balancing of your carbs with the TWINMAX will ensure your engine performs at its best at all times.
Other balancers use either dial gauges with one gauge per cylinder or tubes containing mercury or spring loaded weights and any adjustments to the carburetors are made according to the readings. This means that not only is there the potential for errors to due to the moving parts of each gauge, it is very difficult to ensure that each gauge gives exactly the same reading on a given amount of vacuum, due to variances in manufacturing tolerances, friction differences, volumes of mercury or tension of springs.
The TWINMAX is different. The TWINMAX works by comparing the vacuum present on either side of a single pressure sensor and shows this difference as a meter reading. The carburetor being calibrated at that time is then adjusted until there is no deviation on the meter! No potential errors and only one reading to make at any time. It is accurate within 1mm of Mercury. And you don't have to determine if the bouncing columns are moving the same amount up and down.
The Twinmax is a differential gauge. It looks at two sources of vacuum and tells you if there is a difference.
There are many factors that can influence that difference.
Here are a few:
1) Valves not adjusted equally, i.e. an exhaust valve out of adjustment in relations to the other exhaust valves or intake valves out of adjustment. With an exhaust or intake valve not at the same adjustment more or less intake charge/exhaust charge influences the intake pulse (vacuum) for that cylinder.
2) Spark plugs not all within the same spec. A closer gap requires less time for the spark to cross and requires less energy to cross, thus starting the combustion process quicker that the other cylinders influencing the intake pulse (vacuum).
3) A difference in compression between cylinders. The higher the compressing in a cylinder the stronger the intake pulse (vacuum).
4) If there are more than one set of points a difference in gap will result in unequal firing of the spark plugs. One set firing before the other will result in uneven intake pulses (vacuum).
5) Restriction in the exhaust system on a one exhaust per cylinder
will result in insufficient back pressure upsetting the intake pulse (vacuum).
Spark plugs without the same burn color will
indicate a problem with a cylinder that should be addressed before a good
balance can be achieved