法國的雙缸平衡錶，我最常用如圖TWINMAX The Electronic Carburettor Balancer
注意大聲讀一下英文「Balancer」，
這就只是一個「平衡儀」，不談精度，只要把汽缸平衡好的儀器。
這儀器只有一個錶頭的設計，對應兩汽缸的力量工作，在設計上就已經是一百分，所以一個錶就是零誤差。
兩個錶就已經有兩個誤差，怎麼校正誤差？麻煩哩。
和傳統機械式的比較，當然電子式的比較容易故障，然而十五年過去了，TWINMAX The Electronic Carburettor Balancer
還是非常靈敏。
我有個習慣，買東西會買兩個。
其實英國的Carbtune Synconiser是最傳統的物理性結構，精度也非常好，這一個放著當備品(可用在四缸)。
法國的雙缸平衡錶，我最常用TWINMAX The Electronic如下
Twin Max Carb Sync Tool~說明書如圖
http://ascycles.com/detail.aspx?ID=2146
With use, the chain of cables, rods and linkages that connect the throttle to the carburetors will stretch and change their tolerances which results in the carburetor sliders or butterflies operating at slightly different times from one another. This produces an imbalance in the carburetion of the engine due to unequal amounts of air entering the cylinders at any given time. Carburetor balance, or synchronization, is essential for the efficient running and longevity of your engine. Any imbalance in the timing, or amount of, throttle opening amongst the carburetors on your engine will result in reduced performance, poor throttle response, excessive fuel consumption, increased vibration and increased stress on the crankshaft and bearings.
THE ADVANTAGES OF THE TWINMAX BALANCER Other balancers use either dial gauges or tubes containing mercury or spring-loaded weights with one gauge per cylinder and any adjustments to the carburetors are made according to the readings on each of these gauges. This means that not only is there the potential for errors 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! Synchronizing carburetors with the TWINMAX is simple, quick and gives professional level accuracy every time! Regular balancing of your carbs with the TWINMAX will ensure your engine performs at its best at all times.
o Use with virtually any machine!
o Suitable for fuel injection systems
o Use with any number of cylinders
o Absolutely accurate
o Electronic-no moving parts
o No mercury or springs or weights
o Unit not position sensitive
o Compact
o Portable
o Easy to use
如下~英國的Carbtune Synconiser是最傳統的結構，精度也非常好。
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