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20B/3 Rotor Conversion.. All things to do with 20B/3 rotor... Post pics, video, tech, etc..

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Old 10-21-2011, 11:12 PM   #1
65pb736
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Default Tuck's 20B

Well here we go! The start of a new project. Where to start? Very simply I'm going to put a 20B in a AC Cobra replica. i know, it sounds weird, but it really makes sense. My last project was a Lotus 7 with a 13B, and after autoxing it for two years I started to think about doing the same thing with the newly acquired Cobra with a bb Ford sitting under the hood. The 7 has almost 50/50 balance and weighs in at 1300 lbs, The Cobra with a 460 that I already had, would be very heavy in the front and be around 2300lbs. By using the 20b I estimated that the car would be about 1600 lbs with close to 50/50 balance. The 460 was to be around 450 hp, 20B n/a I'll be happy with anything over 300hp. Anyway here are a few pics of the car as it is right now, and the 20B as it is:
Attached Images
File Type: jpg cobra.JPG (77.4 KB, 62 views)
File Type: jpg cobra1.JPG (30.0 KB, 56 views)
File Type: jpg cobra2.JPG (148.4 KB, 50 views)
File Type: jpg my20b1.jpg (139.0 KB, 79 views)
File Type: jpg my20b2.jpg (149.4 KB, 58 views)






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Old 10-22-2011, 07:18 AM   #2
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Mmmm, this is going to be a nice project lol. Can't wait to see it finished...I like progress pics too though haha.
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Old 10-22-2011, 01:27 PM   #3
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Well you have an interesting project ahead of you, good luck man.
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Old 10-22-2011, 01:34 PM   #4
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Love it, I've wanted to do this for years. Especially to dig at the piston lovers who tell us how closed minded we are to their molestations of Rx-7's with V8 conversions.

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Old 10-22-2011, 08:38 PM   #5
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Touche'!!!!
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Old 10-22-2011, 08:58 PM   #6
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That's another reason I love this project. If I had the money, I'd also do an S2000/13B-REW, and a Datsun 240Z/20B.
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Old 10-23-2011, 06:09 AM   #7
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That 2c0Bra is gonna be sweet. lol
^That would make a cool license plate.

Anyway GL on the build.
Looking forward to the fished product.
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Old 10-23-2011, 04:04 PM   #8
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Sweet. Subscribed. Interesting build..
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Old 10-23-2011, 04:38 PM   #9
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Here is what I kinda invision the end result looking like. With the exception of the paint scheme.

Tuck
Attached Images
File Type: jpg cobra8.jpg (2.2 KB, 536 views)
File Type: jpg cobra9.jpg (49.1 KB, 47 views)
File Type: jpg cobra10.jpg (2.0 KB, 530 views)
File Type: jpg cobra11.jpg (111.8 KB, 40 views)
File Type: jpg cobra12.jpg (90.2 KB, 27 views)
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Old 10-24-2011, 01:08 PM   #10
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i can't say this is something i've ever thought of, but it does sounds QUITE interesting. also, you're right when you say it makes sense. as a fan of the Cobra, i would go with the archaic 429 Ford, but i probably could be coaxed into something more modern. either way, you have a great project on your hands and i'm excited.
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Old 10-24-2011, 01:12 PM   #11
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Very cool and unique. I'm sure you'll get a lot of hate from the muscle heads but your car not theirs. Love it.
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Old 10-24-2011, 09:05 PM   #12
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Hey thanks for all the positive response everyone. Its kinda 50/50 amongst my freinds on the rotary vs bb Ford on this one. On that note I haven't started a build log on the Cobra forum yet, I may have to chose my words carefully and try to exercise some restraint on my preference for the rotary engine for this project. Of course the success of the 20b powered RX8's limited to 8500 rpm for the Rolex Series and Continetal Tire Series kinda speaks for itself.
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Old 11-07-2011, 04:15 PM   #13
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Awesome project. I too almost went this route but decided on the SL-C instead.
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Old 11-08-2011, 04:25 AM   #14
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Just don't tell the Cobra forum what you're putting in there until the project is complete...all you'll hear if you do is complaining or trying to find reasons why it won't work, etc. "Surprise!" lol
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Old 11-17-2011, 08:55 PM   #15
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Well a little update, got the high compression rotors on the way. It also looks like I am finally going to have time to finish the garage this weekend. That means that I can bring the rest of the car over and get started on it. The engine is at RX7 World in Rock Hill, SC, Ernst did a great job on the 13b in the Lotus 7 and I don't expect anything less from him on the 20B. Logan at Defined Autoworks is doing the intake manifold for the triple Webers, ignition right now is going to be Electromotive XDI2. After seeing the 20B and then looking in the engine bay of the Cobra the 20B is going to look tiny in there versus shoe horning a big block ford into it, That will be a big diffrence from doing the Lotus 7 with the 13B, which fit very well but was still a little tight. Hopefully all the engine rebuilding and intake will be ready by the first of the year, sooo here we go!
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