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PostPosted: November 22, 2019, 12:59 pm 
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I don't think the axle center to seat back would be insurmountable. Perhaps with a thinner seat back? What will be an issue is all of the 13B ancillaries, alternator (I relocated mine to the side), Input manifolds, etc. I scaled the engine to size, flipped it around and placed it at 761mm from the axle c/l. Vertical elevation is a question mark. I couldn't find the dimension for axle center to the input shaft. I took a wild stab at it in the dwg. It may have ground clearance issues?


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PostPosted: November 22, 2019, 5:53 pm 
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You can get rid of all the accessories from the front except the alternator pretty easily by running an electric waterpump, electric power steering, and a vacuum pump for the brakes.
Saves a bit of space at the front for sure.
Alternator, you could get away with a micro size one if you have limited electrical loads.

If you're going 13B-MSP from the RX-8 or 13B-REW from the FD RX7 (or a trigger wheel kit for the FC) then you won't have to worry about the distributor/angle sensor bulging out.

One thing to think about, the starter on the Mazda is mounted from the back, and the VW one is from the front.

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PostPosted: November 22, 2019, 6:43 pm 
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Miatav8,MstrASE,A&P,F wrote:
It looks like you have a little less than 420 mm / 16 inches between the axle center and the seat back.
For the axle center to line up, you need around 761 mm / 30 inches.
A rear engine transaxle will be shorter and below the seat back.

The reverse cut gears are very expensive:
http://subarugears.com/

Late 70s vw bus trans is the one to get (091):
https://ratwell.com/technical/Transaxle.html#091

Should be much cheaper to go bec or back-half a fwd car drivetrain like this:
https://www.youtube.com/watch?v=rSicuaj4hHQ
https://www.youtube.com/watch?v=W3s1DMdVskA
https://www.youtube.com/watch?v=KzK9uIIbjqk
https://www.youtube.com/watch?v=IJ_fM4gLLNw


Thank you so much for the information, I really appreciate it!

I am fully expecting to be pushing the seating position further forward, and have the foot well be above and over the front axle. Deleting the "frunk" is something that is of no consequence to me. That was (and currently is) the plan for space for the drive train.

Also, I have no desire to go with a BEC setup with this chassis, as drag racing a BEC and doing a 1,000 mile roadtrip at the same time is a recipe for disaster that will lead to me on the side of the road with no parts availability.

As for using a FWD setup, spacing for width is a bit of a nightmare as well, as 2stroketurbo's Subaru 360 on youtube shows with the 4G63 swap he's trying to do.

Also, I am excited to see how I can engineer my way out of this space dilemma. A rotary is a bit of a priority for me, so if worse comes to worse, I will consider adapting the rotary to a FWD setup and mounting it in the rear transversely. I know a few people have done it before, just not well documented.


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PostPosted: November 22, 2019, 8:01 pm 
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300D50 wrote:
You can get rid of all the accessories from the front except the alternator pretty easily by running an electric waterpump, electric power steering, and a vacuum pump for the brakes.
DatL24, can you mount the alternator alongside (or on top of) the motor? Might require a reverse rotation alternator from a Honda CR-V, a custom bracket and a non-stock belt. I'm doing the opposite, running a CR-V alternator low and in front of an LS-3 to address width and height challenges.

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PostPosted: November 22, 2019, 8:31 pm 
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The alternator is top mounted on the 13B already.
In this case mounting to the sparkplug side would be the space saver.

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Walt
06 RX-8 Shinka
91 3000GT VR4
01 Tibb
04 RX-8 Touring RIP
Some people never have anything except ideas. Go do it.
Emissions & fuel economy haven't exactly been areas of strength for past rotary power plants, but absolutely no one with a soul has ever cared.


Last edited by 300D50 on November 25, 2019, 1:32 am, edited 1 time in total.

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PostPosted: November 22, 2019, 11:08 pm 
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FYI, The stock 13B alternator fits nicely on the spark plug side with not too much effort.

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PostPosted: November 23, 2019, 5:47 pm 
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2stroketurbo also has a vespa 400 that is vw framed at the rear with vw transaxle. Seems to fit well. A rotary would fit even better:
https://www.youtube.com/user/2stroketur ... =vespa+400

Happened to see this bus 091 to rotary block adapter for $100 shipped:
https://www.ebay.com/itm/Adapter-Plate- ... .l4275.c10

Then you can get the flywheel separately from mazdatrix for around $200:
https://www.mazdatrix.com/product/adapt ... o-cltchcw/

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