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Old 09-18-2018, 06:25 AM   #91
equ
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Incredible... I've always loved the body shell, the handling and feel of the RX-8..
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Old Yesterday, 06:54 PM   #92
John V
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I got my engine brackets made. It took me pretty much all day Saturday to get them cut and tacked in place. It was a lot more difficult than I thought it would be. I think the first issue was that I made them out of much thicker steel than I probably should have. I bought 3/16" steel which is pretty hard to work with, especially since I don't have a professional tubing notcher. I could have made them out of square tubing but round is stronger for this application and well... it looks better.

Anyway, I started with a piece of 1.5" OD steel tubing and made a riser off of the engine mount on the subframe. I welded a bottom piece to it that I cut out of a flat plate of 3/16" steel. I drilled a hole in the bottom for the engine mount stud.

Then I notched another piece of tube to mate up with that vertical tube. This was tricky since the bracket on the engine is about three inches forward of the engine mount, and about an inch and a half up. I ended up having to tweak the notches I put in the tube quite a bit to get the angle right. Then I had to cut the other end of that tube so that it would line up with the engine plate. I cut an oblong hole in each plate for the tube to slide into so it could be welded from both sides.

Anyway... lots of words. Here is what I ended up with on the driver's side (passenger's side was too hard to get a picture of).



Ugly tack welds but my machine really struggles with 3/16" steel. On the other side I pre-heated the brackets with a torch which helped a lot and gave me stronger, smaller tacks.

I took the brackets to my buddy Larry who is an expert TIG welder and he finish welded everything. I was pleased that the gaps were all tight enough for him to TIG, and that the tacks I made had good penetration.





This week I'll clean these up and paint them so they don't rust, but I'm really happy to get this step done. The engine has been supported by a above-engine support bar and it's in the way of getting a lot of stuff done. Tack welding these with that bar in place was a bear. I ended up doing what I could from the bottom with the car on the lift, but access wasn't great under there either and I'm such a novice welder I'm nervous doing anything not on a bench.

Next up... transmission mounts and ... a turbo!
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Old Yesterday, 08:23 PM   #93
rumatt
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Those suckers are long!
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Old Yesterday, 08:38 PM   #94
John V
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Yeah, about 5 inches long each.

I couldn't resist going out to the shop and making sure they fit correctly. Driver's side:



Passenger's side:

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Old Yesterday, 09:28 PM   #95
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I'm surprised by the black thing that it attaches to - in the first picture. Is it braced from underneath and I just can't see it? It looks so long that the torque would rip it off the frame.
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Old Today, 05:35 AM   #96
John V
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Quote:
Originally Posted by rumatt View Post
I'm surprised by the black thing that it attaches to - in the first picture. Is it braced from underneath and I just can't see it? It looks so long that the torque would rip it off the frame.
The black thing is a factory Miata engine mount, and yes it's braced from below but will be getting another cross brace. The aftermarket subframe I'm using is not known for being super strong.
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Old Today, 06:05 AM   #97
Nick M3
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Speaking of, are you going to gusset the engine mount arms?
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Old Today, 06:47 AM   #98
John V
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Yes, but I need the turbo, manifold and downpipe first so I can be completely sure where things will end up. I should have all of that this week and I can start mocking all of that up.
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