Engineering English
Bore
Mechanical Engineering · Last updated: July 30, 2026 · How this entry was written
Definition: Bore is the inner diameter of an engine cylinder. It determines the cross-sectional area of the combustion chamber and is a key variable in engine displacement and power calculations.
Example in context
“Increasing the bore by 2 mm raised the engine displacement from 1998 cc to 2125 cc, requiring a revision of the piston ring design.”
“Silindir çapını 2 mm artırmak, motor hacmini 1998 cc'den 2125 cc'ye çıkardı ve piston segmanı tasarımının revizyonunu gerektirdi.”
Where engineers use it
Bore is used alongside stroke to define the engine's displacement. During engine design, engineers select bore to achieve target displacement and combustion characteristics. It also affects the sealing of piston rings.
Synonyms: cylinder diameter
Antonyms: stroke
Practice: can you use “Bore” at work?
You are evaluating an engine upgrade. The new cylinder head requires a larger bore. Determine the impact on the existing piston ring grooves and recommend a new ring setup.
Show a model answer
“Could you verify the bore dimension on the blueprint?”
“Bore” in 21 languages
| English | Bore |
|---|---|
| Turkish | silindir çapı |
| French | alésage |
| German | Bohrung |
| Spanish | diámetro del cilindro |
| Chinese | 缸径 |
| Arabic | تجويف الأسطوانة |
| Portuguese | diâmetro do cilindro |
| Russian | диаметр цилиндра |
| Japanese | ボア |
| Italian | alesaggio |
| Vietnamese | đường kính xi lanh |
| Hindi | बोर |
| Thai | เส้นผ่านศูนย์กลางกระบอกสูบ |
| Indonesian | diameter silinder |
| Korean | 보어 |
| Bengali | বোর |
| Dutch | boring |
| Swedish | borrning |
| Finnish | poraus |
| Ukrainian | діаметр циліндра |
Frequently asked questions
What does Bore mean in engineering?
Bore is the inner diameter of an engine cylinder. It determines the cross-sectional area of the combustion chamber and is a key variable in engine displacement and power calculations. In Mechanical Engineering, the term carries a usage-frequency rating of 10/10 in the Engineering English library.
How do you pronounce Bore?
Bore is pronounced /bɔr/ (IPA). The Engineering English app plays audio for the term and checks your pronunciation with speech recognition.
How is Bore used in a sentence?
Example from an engineering context: “Increasing the bore by 2 mm raised the engine displacement from 1998 cc to 2125 cc, requiring a revision of the piston ring design.”
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