คว้านกระบอกสูบ ทำเพื่ออะไร มีประโยชน์อย่างไร กับเครื่องยนต์ (รถมอเตอร์ไซต์)

วิชาญอะไหล่ คว้านกระบอกสูบ คว้านเสื้อสูบ

คว้านกระบอกสูบ ทำเพื่ออะไร มีประโยชน์อย่างไร กับเครื่องยนต์ (รถมอเตอร์ไซต์)

ที่จริงแล้วเป็นการคว้าน “กระบอกสูบ”  ไม่ใช่คว้านลูกสูบ  สาเหตุที่ต้องคว้านกระบอกสูบมีอยู่สองสามประการ
1. สำหรับเครื่องยนต์ที่ใช้งานมานานและสีกหรอไป  การสีกหรอของกระบอกสูบจะเป็นมากในส่วนบนของกระบอกช่วงที่แหวนลูกสูบเดินทางขึ้นสูงสุด  เมื่อกระบอกสูบสึกหรอมากก็จะทำให้กำลังอัดรั่ว  ประสิทธิภาพการทำงานของเครื่องยนต์ก็จะตกต่ำลง
2. การสิ้นเปลืองน้ำมันเชื้อเพลิง-น้ำมันหล่อลื่นเพิ่มขึ้น  การคว้านกระบอกสูบก็เพื่อลบรอยสึกนั้นออกไป กระบอกสูบก็จะมีขนาดโตกว่าเดิม ก็จะต้องเปลี่ยนลูกสูบให้โตขึ้นเท่ากับขนาดกระบอกสูบ  เรียกว่าโอเวอร์ไซซ์ (oversize)  สาเหตุอื่นที่ต้องคว้านกระบอกสูบเช่นเมื่อกระบอกสูบเสียหายเนื่องจากลูกสูบติด-ลูกสูบไหม้ ทำให้ผนังกระบอกสูบถูกครูดเป็นรอยชำรุด  ส่วนการคว้านกระบอกสูบเพื่อเพิ่มความจุของกระบอกสูบนั้นต้องคว้านออกไปมากซึ่งก็มีข้อจำกัดขึ้นอยู่กับความหนาของเสื้อสูบ โดยปกติแล้วการคว้านโอเวอร์ไซซ์จะเป็นขั้นละ 0.020 นิ้ว จนถึงสูงสุด 0.060 นิ้ว ซึ่งจะไม่เพิ่มความจุของกระบอกเท่าไรนัก

คว้านเสื้อสูบ โดยช่างชำนาญงาน
คว้านเสื้อสูบ โดยช่างชำนาญงาน

 

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78 Replies to “คว้านกระบอกสูบ ทำเพื่ออะไร มีประโยชน์อย่างไร กับเครื่องยนต์ (รถมอเตอร์ไซต์)”

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