Joff and MrsJoff's Chaste White BorgWarner FD build

[joff]

Originally Posted by TitaniumTT

Another way to do it would be to soak a towel in acetone and pull it through with a line. Has always worked well for me.

Yep, I was doing exactly that with the shop towels. The acetone just was not cutting it as a solvent. I must have pulled about 5 towels through that way and each time the rags were coming out dirty from the PCV gunk. Whatever is in that brake cleaner is some strong stuff.

Originally Posted by TitaniumTT

I've thought about extrude honing the manifolds, but can't really justify the near $700

I wondered how expensive that would be. I would think there would be a lot to gain by simply polishing the inside passageways to get rid of the casting texture, but I didn't see an easy way get a sander in there.

One thing about that UIM is that even after porting it, pulling stuffed towels through it it definitely seems the biggest constriction is right at the UIM exit as thats when I had to use the most pulling force. I'll bet that since using the Xcessive LIM, this spot is the 2nd most constrictive point after the engine ports themselves.