A valve job increases compression, but it also increases ____, which can cause more oil to be sucked past the worn piston rings into the combustion chamber.
A) engine vacuum
B) engine knock
C) oil wash
D) piston slap

Question

Quizplus · Accepted Answer

A valve job can increase engine vacuum because it improves the seal between the valve seats and the valve faces, leading to a more efficient draw of air and fuel into the combustion chamber. This increased vacuum can exacerbate the issue of oil being sucked past worn piston rings into the combustion chamber.

A Valve Job Increases Compression, but It Also Increases ____