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!

[CrankyOldMan]

Originally Posted by tooter

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.

I have access to CNC mills at school and AutoCAD at home, so that's not a big deal. The issue I was considering was the inset channel for the runners being on the opposite side of the machining face. Any time you relocate a part, you're asking for alignment issues. We're not trained/allowed to use edge finders on the equipment at school, so it has to be a single-sided operation. Now if I could just get AutoCAD to stop crashing, I could get this new plate drawn up...

[tooter]

Originally Posted by CrankyOldMan

I have access to CNC mills at school and AutoCAD at home, so that's not a big deal.

All right, Crank! Man, you're certainly going to win the contest hands down of building the cheapest manifold!

The issue I was considering was the inset channel for the runners being on the opposite side of the machining face. Any time you relocate a part, you're asking for alignment issues. We're not trained/allowed to use edge finders on the equipment at school, so it has to be a single-sided operation.

Oh, this is something I know absolutely nothing about. All I know is that the machinists told me that making the adaptor was a simple straightforward job for them.

Now if I could just get AutoCAD to stop crashing, I could get this new plate drawn up...

Good luck... and do keep me posted on how your project goes. Sometimes two people figuring out how to do the same thing can come up with new and different approaches and techniques.