Rotor housing question during rebuild
 

Hi all,

Maybe I'll have better luck posting this here.

I have been rebuilding a series 5 turbo engine to swap into my Gtus.

I took the engine all the way apart last weekend, and found that the irons, one housing, and rotors all looked pretty good. However, one housing has a questionable gouge in it, and I don't know if the housing can be reused in it's current condition.

I would find a replacement.

GTUs is a pretty rare bird. Are you sure you want to turbo it instead of restore?

Yeah I've decided to turbo it, I was hit a year ago in it and the passenger side is dinged up a bit, and has a mismatched door on it now, so it's fairly ratty now haha. Also the na 13b in it just blew a coolant seal, so it's time for a swap haha.
Looks like I'll be using the rotor housing out of my NA, as I assume those are in better shape. The baffles in the exhaust port on the NA housing can be knocked out, right?

Just swap the inserts from the turbo housings. They're held in by two small roll pins. Methods on removal are to try and tap them and insert a screw or weld piece of wire onto them. I've removed them after the tap kinda felt like it might break if I tried and further.and using the tap to pull them (taps break easy, especially small ones). If you have a drill press, drill them out but, go slow because they have some hardness to them. They're standard metric roll pins.

If you can feel it with your fingernail it needs to be replaced or you will have low compression.

FYI turbo and NA housings have slightly different spark plug locations and should not be mixed due to timing differences if you can avoid it. Exhaust sleeve is also different, as are the coolant ports.

They can be mixed though... it just isn't ideal.

S4 and S5 have different spark plug locations, it's not a difference of turbo versus NA.
The spark plug difference also has no effect on timing. Timing is a value of when the spark plug fires in correlation to the rotor and eccentric shaft position. Moving the spark plug up or down does not change this. Moving the spark plug changes where the flame front propagates from, not engine timing.

You're batting 0.500 Scathcart.

Okay, I was planning on just using my NA housings with the baffles drilled out. How difficult is the process of drilling the housing for the coolant port?

I have access to a drill press, tig welder, etc. so I am thinking about trying to drill the NA housing.

If you do some searching, you'll find people have used other ways to get coolant to the turbo.