blowby
/ˈbloʊˌbaɪ/
noun
- Gas or fluid that leaks past a piston or seal in an engine, often reducing efficiency.
- Excessive blowby can cause oil to enter the air intake system.
- The mechanic said the engine had too much blowby and needed new piston rings.
- We measured the blowby to check the health of the old diesel engine.
Synonyms