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Old 10-10-18, 08:08 PM
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And now for something completely different

So, my bridge port is "f*cked":



And all I have left are some scrody 6 port stuff and a seriously hacked-up Pro-Jay (JW? Non-RB) 6-port manifold that I acquired a while back.

Figure 2: Porting through to air




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Old 10-10-18, 08:13 PM
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It has to get worse before it gets better...







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Old 10-11-18, 10:30 AM
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You've always done so interesting and far-out things for as long as I've been here. So I look forward to what you're doing with this. I think I was able to follow all the photos so far, but I do have one question. In the first photo of Post #2, are those hole for you to make some kind of anchor for the epoxy or are they there for something else?
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Old 10-11-18, 12:56 PM
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Exactly. I had epoxy come loose in an intake manifold once, so I anchor it whenever I can. I drilled a couple holes through with a counterbore for extra overkill, then pushed the epoxy (Quiksteel) through and then mooshed it over like a rivet. Then more on top for good measure.
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Old 10-12-18, 12:35 PM
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The one that came loose, was that the 6-port manifold that you had converted to your T2 block? If so, I guess I missed that somehow. Did the broken piece get ingested?
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Old 10-12-18, 02:05 PM
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No, it was a 6 port FC lower that I added epoxy to the primary port roofs to match up to a GSL-SE, since the -SE ports are lower. Maybe 2-3mm difference. The engine was pulled to install the 4 port engine I'd been building all summer, when I got around to disassembling it, besides a broken apex seal (still ran and had compression, it didn't FOD itself, just had one seal broken and looked like it was like that for a while) I noted that the epoxy in one of the ports was loose. Not fully fallen off yet, but touching it with my finger made it break away.

SO much bad could have happened but didn't!
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Old 11-02-18, 03:22 PM
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Any progress with this, Peejay?
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Old 11-02-18, 04:54 PM
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So you are just adding epoxy to the aux port?

I figured you were going to open them up and make a big port then epoxy it down to something more reasonable.
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Old 11-03-18, 10:20 PM
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Originally Posted by diabolical1 View Post
Any progress with this, Peejay?
Not really. I cleaned up my bridge port's intermediate housing and found that it has .005" step wear. So i cleaned up the unported intermediate that came with the engine that donated the two end housings and found that a dime sized section right in the corner seal track in the combustion area rusted away to leave a deepish pit. So my only options for assembling the engine are questionable.

GSL-SE intermediate is required, as I need it for the injector bungs and for the engine mounting. Even if I had any 12A intermediates (I don't) they would leave me with no way of putting the engine in the car due to the FC front end.

I *could* deconvert it to FB front end and keep the FC struts with some Mazda3 ball joints, and I do have all the stuff to do this, but when I do this I want to get a steering box that has had a plastic pin locator failure, and splice a 2:1 steering quickener in it.

It's depressing and a continuation of all of the issues I had trying to get my '81 on the road. I am thinking more that the next step is a LS4, since you can easily find those engines for $600-700, and whatever TH350 I can find. I already have acquired a 2.75 gearset for the 9". I'll save all my remaining rotary stuff for the '81 and for the RX-3.

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Old 11-04-18, 04:31 PM
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Oh man, that sucks! If I had some, I would surely send you a housing to get this thing together, but alas, I'm sort of parts-poor myself at the moment with the pre-'86 stuff. I can't wait to be able to start stockpiling whenever I am finances allow me to. Re-converting the front sounds like moving a couple steps back to take one forward. I mean, surely you converted for a reason in the first place.

So you're thinking of crossing over, huh? Well, definitely post whatever you do. You always have an audience with me. I mean, if I'm hearing you right, it makes sense.

On a separate note, I didn't realize you had an Rx-3 now. Congratulations on that.
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Old 11-04-18, 07:50 PM
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The main problem with V8s is they don't accelerate worth a crap. They can make power but they aren't very drivable. I do like the idea of a 3400 or 3800 six, or a nice 2.4l Duratec, but any time I think about any of that, I end up spending way more money than buying a pair of new rotor housings and getting a set of side housings ground/lapped/rehardened. So, project stall.

The reason I converted is that I more or less ran out of strut housings. The snouts would bend a little and then there would be no way for the bearing to adjust properly. The FC has a much beefier spindle. The rest of the suspension is not as good, I think, as the roll center is way wrong for the rest of the chassis. Works fine with the ground-level rear roll center in the FC but not so much with a solid axle. I never really liked the way the FC front handles.

I made an interesting discovery today: Most of the apex seals in the engine were way overlong. The rotor housings both measure 3.148" and the shortest of the apex seals was 3.149, most were in the 3.150-152 range and one was 3.158! How did I screw that up? I spent a lot of quality time clearancing the lengths, clearly not enough!

Ironically the thing that got me motivated to work on this mess was discovering a 4 lug hub that will work on the suspension I want to slide under the RX-3...

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Old 11-04-18, 10:17 PM
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Oops.





That rust. Still not as bad as my bridge ported intermediate, so we're going with this one.





Stock GSL-SE primary ports. TOINY!!





Port taking shape.

The original "something completely different" was going to be a half bridge with the intermediate bridged (because It Was There) and the ends opened up to huge volume and stock untouched port windows. With that no longer possible, I'm going to do another one of my ports that are based on the theory of maximizing port energy. I tentatively call this the "peejay port". The opening line gets raised a lot, while the corner seal track line stays right where it is, so the "closing" line almost points at the center of the engine.

Why do I do this? Let's get the help of Rotor-san:





This is approzimately the point of fastest volume expansion. I want the port to be aimed more or less at the center of volume. Incidentally, MFR peripheral ports are aimed this way, and they work better than P-ports that angle down...

The aux ports in a 6 port are so high up that you get the same angle of attack flowing "straight in", which is the reason why I am not bothering to touch the port window.
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Old 11-13-18, 09:52 PM
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Originally Posted by peejay View Post
This is approzimately the point of fastest volume expansion. I want the port to be aimed more or less at the center of volume. Incidentally, MFR peripheral ports are aimed this way, and they work better than P-ports that angle down...

The aux ports in a 6 port are so high up that you get the same angle of attack flowing "straight in", which is the reason why I am not bothering to touch the port window.
This actually makes sense to me ... I think. Is this sort of another take on how Mazda did the secondary runners in the REW - with that pronounced angle?
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Old 11-23-18, 06:37 PM
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The REW ports go the opposite of ideal. I think Mazda only did what they did to make room for the turbos without putting a bad kink in the lower manifold like the FC had.


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