Put the coil pack together last weekend
Didn't get any pics of the bore in the adapter, but had the first iteration of the single plate throttle adapter cut
It still had serious clearance problems. The water manifold is *NOT* in place in this photo.
Got this measurement over to Eric, who confirmed that the 8 wire throttle actually has a larger dimension than the 6 wire unit, so I won't be able to switch to improve clearance.
And this measurement was a big PITA to get.
After evaluating the fit of this first iteration of the adapter, I'm pretty sure I can make it work this way, but not this revision. The bore in the manifold is 3.120" while the edge on the throttle is 3.030". The bore in the adapter is 3.030 to match the throttle. The bore in the adapter ended up tangent to the BOTTOM of the bore in the manifold, so I can move the adapter bore up until it is tangent at the TOP of the manifold bore. There wasn't really any room to move the throttle around on the adapter; I did a decent job getting that right the first time.
I ALSO noted that if I angle the 3.030" bore in the adapter such that the long axis of the resulting ellipse is 3.120" on the adapter surface, that angle is 14 degrees. Angling the bore to offset the throttle gives me another 0.90 in a 3/8" plate. I think between moving the bore up to tangency at the top of the manifold plate and angling it 14 degrees further up, I should have "plenty" of clearance to make everything work.
However, the bolt holes are overlapping awkwardly, so I need to put some more thought into how to deal with that.
I do need to test fit with the motor on top. That's the original orientation, so it's actually "right-side-up" that way. However, I need to counterbore the adapter plate and get (cut/make) shorter M6 screws in order to do that.