Can a broken rocker cause bad compression?

[Earendil]

There is surprisingly little on the internet about this, probably because if someone breaks a rocker they don't try a compression test first thing. But I'm curious.

Intuition tells me that a broken rocker on the exhaust side would not cause bad compression, because the cylinder is still filled with air prior to compression.

However I can imagine that a rocker on the intake side wouldn't allow air in, causing a vacuum on the down stroke, and thus zero compression on the up stroke. Is that legitimate reasoning?

[bimmerteck]

There is surprisingly little on the internet about this, probably because if someone breaks a rocker they don't try a compression test first thing. But I'm curious.

Intuition tells me that a broken rocker on the exhaust side would not cause bad compression, because the cylinder is still filled with air prior to compression.

However I can imagine that a rocker on the intake side wouldn't allow air in, causing a vacuum on the down stroke, and thus zero compression on the up stroke. Is that legitimate reasoning?

Broken rockers can certainly cause wonky compression test results, just depends on the size of the broken piece and where it ends up.

[dnguyen1963]

Slow day at work?

[Earendil]

Slow day at work?

In the sense that I actually get a lunch break, yes :)