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In order to successfully complete the swap, you must be able to mount the engine in the car. in this section, we will discuss some options.
Engine mounts generations
Through the generations, there are 3 main engine mount configurations.
- 12a front cover mount (can be swapped to 13b engines)
- S4/S5 middle iron mounts
- S6/S7/S8 rear iron mounts
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Stock Subframe
I’ve seen some folks chop up the stock subframe, box it in, make custom mounts, etc., and this avenue works great for the experienced fabricator, or those with a bit more time on their hands. In the Stock Subframe section, I’ll share photos of some stock subframe examples, but be prepared to cut up your stock subframe. THE ENGINE WILL NOT FIT ON A STOCK SUBFRAME. Although the 12a/13b is a small, compact engine, it is substantially wider than the stock 1.6L/1.8L.
Tubular Subframe
The next option for those looking for a bit less work is a replacement tubular subframe. Currently, the market leader is v8roadsters’s mount less subframe. While their namesake is their LS and other v8 swap kits, they offer a “mountless” solution for custom swaps. This is what I have used.
Disclaimer: While they are a leader in the bolt-in tubular subframe Miata market, I have heard from several folks of poor QA historically from the v8roadsters team. While it is typically something that can be corrected (rack and pinion nut askew/misaligned), bent control arm mounts, etc), there have been some folks to complain. This being said, they have many satisfied customers and provide their subframes out to be included in various swap kits for Miata’s.
Swap kits
There have been a few kits to hit the market over the years, but they have all come and gone. In the US, the most commonly found swap kit is a subframe from lucky7racing. The subframe is currently listed at $1,999 and is made to order with a significant lead time.
In recent time, on the Rotary Miata Club Facebook page I have learned of someone who has purchased this kit. Lucky7 claims the kit is ready to go for a middle iron mount engine. However, it seems that insufficient information is provided in the kit, as the user claimed that it placed the engine FAR too far forward.
I am not familiar with this kit personally, and will try and update if I hear of others with success using this kit.
Rotary Miata 