Tuck's 20B

65pb736 · 10-21-2011, 11:12 PM

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:

speedjunkie · 10-22-2011, 07:18 AM

Mmmm, this is going to be a nice project lol. Can't wait to see it finished...I like progress pics too though haha.

RotorDad · 10-22-2011, 01:27 PM

Well you have an interesting project ahead of you, good luck man.

Trout2 · 10-22-2011, 01:34 PM

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.

Jack

65pb736 · 10-22-2011, 08:38 PM

Touche'!!!!

speedjunkie · 10-22-2011, 08:58 PM

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.

N.RotaryTech · 10-23-2011, 06:09 AM

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.

Ian · 10-23-2011, 04:04 PM

Sweet. Subscribed. Interesting build..

65pb736 · 10-23-2011, 04:38 PM

Here is what I kinda invision the end result looking like. With the exception of the paint scheme.

Tuck

diabolical1 · 10-24-2011, 01:08 PM

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.

Force13b · 10-24-2011, 01:12 PM

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.

65pb736 · 10-24-2011, 09:05 PM

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.

RX-Heven · 11-07-2011, 05:15 PM

Awesome project. I too almost went this route but decided on the SL-C instead.

speedjunkie · 11-08-2011, 05:25 AM

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

65pb736 · 11-17-2011, 09:55 PM

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!

10-22-2011, 01:27 PM	#3
RotorDad Big Ugly Join Date: Apr 2009 Location: Fredericksburg, Va iTrader: (1) Posts: 591 Rep Power: 16	Well you have an interesting project ahead of you, good luck man. __________________ *Boosted Big Body On 335's* PS3 ID: Rotordad 1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect. 2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect. Last edited by RotorDad; 10-22-2011 at 01:33 PM..

10-23-2011, 06:09 AM	#7
N.RotaryTech Home-brew Rotary Join Date: Feb 2008 Location: GooseCreek SC iTrader: (0) Posts: 552 Rep Power: 17	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. __________________ '89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior. '83 RX7, The "this might take awhile" project. '87 RX7 GXL, Rest In Pieces. '98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair. '94 Ford Ranger, daily.

10-23-2011, 04:04 PM	#8
Ian REIAN Join Date: Feb 2008 iTrader: (0) Posts: 112 Rep Power: 17	Sweet. Subscribed. Interesting build.. __________________ 1989 Turbo II. Track Car 1988 10thAE. Garage Queen 400+rwhp

11-07-2011, 05:15 PM	#13
RX-Heven The Newbie Join Date: Feb 2008 iTrader: (0) Posts: 20 Rep Power: 0	Awesome project. I too almost went this route but decided on the SL-C instead. __________________ -Dave 20b RCR Superlite Coupe 91 Widebody Turbo Vert...RIP

10-22-2011, 07:18 AM	#2
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	Mmmm, this is going to be a nice project lol. Can't wait to see it finished...I like progress pics too though haha.

10-22-2011, 01:34 PM	#4
Trout2 Rotary Fanatic Join Date: Mar 2008 iTrader: (0) Posts: 104 Rep Power: 17	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. Jack

10-22-2011, 08:38 PM	#5
65pb736 Rotary Cone Killer Join Date: Sep 2011 Location: South Carolina Coast iTrader: (0) Posts: 21 Rep Power: 0	Touche'!!!!

10-22-2011, 08:58 PM	#6
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	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.

10-24-2011, 01:12 PM	#11
Force13b cxxxx\|::::::::::::> Join Date: Nov 2009 iTrader: (1) Posts: 315 Rep Power: 16	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.

10-24-2011, 09:05 PM	#12
65pb736 Rotary Cone Killer Join Date: Sep 2011 Location: South Carolina Coast iTrader: (0) Posts: 21 Rep Power: 0	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.

11-08-2011, 05:25 AM	#14
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	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

11-17-2011, 09:55 PM	#15
65pb736 Rotary Cone Killer Join Date: Sep 2011 Location: South Carolina Coast iTrader: (0) Posts: 21 Rep Power: 0	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!