2011年9月20日 星期二

Engine Harmonic Damper for Eclipse 4G63

前陣子翻了維修保養紀錄之後, 就開始準備正時皮帶及周邊零件採購, 準備一次工, 把引擎右半邊所有的耗材全部換新.
在把零件清單列出來的過程中, Crankshaft Pully(曲軸皮帶盤)勾起了過往的回憶, 記得去年貳號機進行 例行保養 20100630 Crankshaft Damper Pully 的時候, 發現曲軸皮帶盤脫膠而進行更換, 事後特別查詢過那層硬橡膠功用.
它的作用是平衡減震, 緩衝曲軸承受活塞及連桿推動所引發共振, 要是緩衝不良, 引擎運轉相對會不順暢, 震動也會比較大, 連帶引響的就是車身抖動.
靈光一閃, 似乎有在哪看過曲軸皮帶盤的高檔升級品(不是輕量化曲軸皮帶盤喔, 麵包對那東西沒興趣), 馬上又再度啟動搜尋引擎, 終於找到了相關的資料, 大概介紹一下.
FLUIDAMPR Engine Harmonic Damper.

匯集FLUIDAMPR官網的產品說明如下:
Why your engine needs a damper:Each time the air/fuel mixture inside a cylinder is ignited, the combustion that occurs creates a torque spike that is applied to the crankshaft through the piston and rod. This torque spike is so severe that it not only turns the crankshaft, it actually twists the crankshaft ahead of its normal rotation and then the crankshaft rebounds. This twisting action is known as torsional vibration. When these torque spikes and forces get into phase with the natural frequency, critical torsional harmonic vibrations occur and can be seriously destructive to the bearings and the crankshaft. Dampers are designed to control those destructive vibrations.

Rubber VS Silicone Fluid:Critical harmonic vibrations occur numerous times in a engine’s operating range. Stock rubber and elastomer-type dampers are frequency sensitive “tuned absorbers”, and work at only one critical frequency. In the case of a stock rubber damper, it is tuned for a factory engine’s critical harmonic vibrations. If you change the mass of pistons, rods, or the crankshaft, you change the natural frequency of the crankshaft assembly; therefore, the stock damper is no longer tuned to the new frequency of vibration, and you may be headed for early failure of expensive engine components. Dampers also create heat while they work, and rubber is a poor dissipator of heat. This heat and the exposure to the elements deteriorates rubber, causing it to crack and change durometer, which then leads to inertia ring slippage, damper failure, uncontrolled torsional vibration, and costly engine parts breakage.

Damper Facts:
1.) Most stock dampers are actually tuned absorbers and do not work when the the engine is modified from the original set-up.
2.) The damper is not a balancer. It's job is to control torsional vibrations.
3.) The silicone inside a Fluidampr will not expire and is not effected by temperature change.
4.) An externally balanced assembly should be balanced with only the counterweight or stock damper installed.

Notes: Street Series, Internally Balanced, Anodized Aluminum.
Harmonic Damper可不是輕量化普利盤, 它的重量跟原廠產品差不多, 產品的重點是皮帶盤中心有著液態矽膠, 使得它的動態平衡非常之好, 也更提升吸震平衡的功能, 這個差異在引擎高轉速或增大馬力的之後更明顯.
這裡有一段從Youtube上翻出來的影片, 可以看到它與原廠曲軸皮帶盤明顯動態的差異.

當然, FLUIDAMPR並不是市面上唯一的廠牌, ATI Performance Products也有類似產品, ATI Super Damper® Harmonic Dampers.
它除了跟FLUIDAMPR有著一樣的功能之外, 本體還附上了曲軸齒輪盤, 整體性更高了, 但相對地, 價錢也就更高出許多.
經過一番天人交戰, 最後還是決定買FLUIDAMPR, 慣例的開箱.

豐厚緊實的外箱, 比想像中的要大很多.
驗明正身, Mitsubishi 4G63T  DSM用.
內容物有產品全罩軟泡棉包妥的FLUIDAMPR Engine Harmonic Damper本體(難怪這麼大一箱)、安裝說明書、貼紙及SFI SPEC 18.1認證證明.
FLUIDAMPR Engine Harmonic Damper本體正面.

FLUIDAMPR Engine Harmonic Damper本體背面.

FLUIDAMPR Engine Harmonic Damper本體側面.


質感很棒, 找機會再安裝上車吧.

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