An End-of-build Retrospective on my Rx7 Evo GT by gmonsen

7 minute(s) of a 280 minute read

ogan has finished the intake manifold and just has to add the throttle bodies and we're good to go. Logan says the flow is even better than his manifold on his 3 rotor. There is quite of bit more to the inside of these than is apparent, but he would prefer I don't show the insides for proprietary reasons. He wanted to be sure that, if I posted these, I mentioned a) the welds needed to be thick in order to keep the inside flow as smooth as possible, given the very thin walls and "what's inside". Once smoothed, they will be painted wrinkle finish black. I told Logan, being the horny old bastard I am, that they looked like 3 girls on their knees with bikinis on bending over backwards... You'll see them too.  

I included a picture that shows the holes in the intake flange for the ball bearings and butterfly end rods that will control the opening and closing of the secondary throttle butterflies. Its really exciting to see this fairly complicated design finally coming together.

G

Here are my 3 girls... 

Note that the wiring (harness coming across the fuel rail and seen going down the front and rear irons, for example) is all encased in Snakeskin to eliminate any visible wires or wires wrapped in tape of some sort. And speaking of the fuel rail, it now stands out like a sore thumb. We'll polish it.

If you look at the flange where the secondary ports are, you can see the holes for the secondary throttle butterflies inside the openings and at the top of the flange (bottom in the picture) where the rod extends out for the actuators. 

5-5-2013

Ha. I got censored in England for that... And, yes. We are putting a gold leaf covered aluminum heat shield between the exhaust and the intake runners. Damn. Its necessary, but I wish it wasn't. It will fire Monday or Tuesday. By then he will have replaced the AST by building the function into the front cover and hooked up the oil reservoir where the ABS went. The whole thing, including the entire exhaust will be complete except for the actuation of the a) secondary throttle butterflies and -- I think -- the actuation of the exhaust cutout. When we start it up Monday or Tuesday, that will be handled manually. 

The exhaust has been a lot of work, because it is very complex in its entirety, what with the multiple pipes and mufflers, the electric cutout controlling the opening an closing of the second pipe, plus the dual in-bumper exhaust. While this is not going to be a very powerful motor in the scheme of things, it is probably the most sophisticated rotary motor that's been built and certainly the exhaust is as well. (After all this, I have to be able to lay claim to something being special about it... )

5-7-2013

Here are some pictures of the intake setup fairly complete. Some grinding and wrinkle finish on the runners and the actuator for the secondary butterflies. But its looking pretty good. I still need to test the wide and narrow (black) mouth air horns when we dyno, so I won't be choosing for a while.

G

5-8-2013

More foreplay... Here's the finish intake flange. You can clearly see the 3 secondary port butterflies on the inner housing side of the flange. They run in ball bearings and Logan says you can blow on them and they move. Again, these will be opened and closed based on manifold vacuum. 

So, the entire intake should be back on tomorrow and I'm hoping we start it up by tomorrow evening. There is very little left, though its several or maybe a few more that need to get done still.