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1978 12A engine blueprints

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Old 12-13-23, 05:51 AM
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1978 12A engine blueprints

Dear all,
I'm looking for drawings or blueprints of this engine. I searched the web but I found just few references.
Probably in a japanese book or magazine I could find what I'm looking for, but I don't know which one.
I'm not the owner of a car but I bought a model kit that's mostly curbside and I want to add the engine to it.
The problem is to find drawings or blueprints with I can use to build the missing engine by myself.
If any of you got any suggestions I'd appreciate it.
Thank you.
Old 12-13-23, 10:46 AM
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Easiest idea is probably to use a 3d print .stl file which can be scaled for your exact scale.

an example from searching 5 seconds for “rotary engine” on thingiverse. It’s a fd3s engine though with a single turbo.

https://www.thingiverse.com/thing:3006071
Old 12-13-23, 11:40 AM
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Thank you very much for the hint, I know thingiverse but I never used it, also I'd have to find somebody to print the model.
However I haven't found the 12A I need.
Old 12-13-23, 08:44 PM
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i'm not sure i understand what you are actually looking for, but you can download a copy of Rotary Engine (the Yamamoto book) from: Foxed.ca
you might find something useful in it.
Old 12-13-23, 09:35 PM
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You can import STL files into Fusion360 CAD/CAM and generate blueprints.
Old 12-14-23, 05:18 AM
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Thanks alot for the help, guys. Diabolical, that link is great.
I need just a blueprint or even a drawing that show the engine different sides, left, right, above, below, front, back, so I can build one by myself.
The model kit I bought is mostly curbside and I want to add the engine.
Now a question. The best book I downloaded is the one you suggested me, Yamamoto's, however the engine is the type in the Mazda RX-2. I also downloaded Japan RX7 1-2 engine but the views are 3/4. Is the engine in the RX-2 similar or the same as that of the RX-7?
Old 12-14-23, 12:10 PM
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they are the same in that they are both 12A engines, but depending on the year, they could have some slight internal and external differences.
Old 12-14-23, 01:33 PM
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Perfect. The kit is the 1978 RX-7 so if there are some differences I can manage to modify the engine.
I only need the external sides obiously.
One thing: the 12A is different than the one in the '67-'72 Cosmo, right?

Last edited by lleo; 12-14-23 at 01:38 PM.
Old 12-14-23, 02:11 PM
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The STL file imported into Fusion360 will let you rotate the CAD to see all side at any angle.

Here is another solution. Just click to see the 3D model. https://grabcad.com/library/rotary-engine-36. Click the "Load 3D Viewer" hold your mouse down over the 3D object and pan in any direction.

https://grabcad.com/library/wankel-engine-21 (This one is a complete engine with all accessories)

https://grabcad.com/library/tag/rx7

Last edited by KansasCityREPU; 12-14-23 at 02:17 PM.
Old 12-14-23, 06:49 PM
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Originally Posted by lleo
One thing: the 12A is different than the one in the '67-'72 Cosmo, right?
yes. that is a 10A.
Old 12-17-23, 04:42 AM
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Thanks alot guys
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