There are a couple of vacuum lines going through the rats nest into the rotors - one is 4mm and one (under the fuel damper) seems 6mm. Just curious what these are doing?

I see them on the (great) diagrams but couldn't find anything describing their purpose.

 

There's one that looks like it's going into the block but it's actually just a nipple on the LIM
I think that's the FPR line

The operation of which is in F-111 of the FSM



There's these two that go right into the rotor housings for the oil squirters, part of the oil metering pump system.
You'll notice the clear plastic tubes that join them at the injectors full of engine oil.

 

Thanks - the rotor/oil squirter ones were the ones I was curious about.

 

Both squirters wound up being 4mm - felt like 6mm but took the fuel rails off and the remains of the old hose tricked me.

Thoughts and prayers to anyone else doing this job.

 

Without a detailed diagram of the system or its exact context, it's difficult to be more specific, but these are typical roles of vacuum lines in an engine or technical system. If you can give me more information (engine type, precise diagram, make/model), I can provide you with a more detailed analysis.

 

For those that aren't aware, Sakebomb makes this nice big poster with the vacuum / turbo control system:
https://www.sakebombgarage.com/sakeb...system-poster/