tooter's manifold adventure...

[tooter]

Originally Posted by CrankyOldMan

Oh, I had intended to cut the runners from the plenum for my design, so I made them concentric.

Ok, I get it now.
I didn't know that you were going to cut apart the manifold runners.

If you look carefully, the runners holes are proportionately wider than the intake holes.

Yes... and no wonder you showed them concentric.

I had considered what you were planning, but decided it was too much of a stretch and would make machining it a nightmare.

Are you going to machine it yourself? It would be a tough job trying to correct the offsets which is good you're not going that route. That's why my friend suggested hiring someone with a CNC machine, because it's a simple matter for it to render the difference between the two arrays smoothly.

The 1NZ has 83mm bore spacing and the intake has (iirc) 87.5mm spacing. I had that written down somewhere...

Note how none of the runners surfaces physically touches any of the other runners. When you cut them apart to reposition them, it would be a good idea to make sure that there is no contact between them as under vibration they can chafe. I worked on helicopters as a mechanic in the Army, and preventing aluminium parts from chafing during flight was always an issue... not that our Yaris' could ever fly!