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(ENGINE) 20B First Gen RX-7
G'day everyone,
Thought I'd post up some pics of my Series 3 RX-7 20B. Conversion is almost complete. Engine has been rebuilt and extend ported. I'm running it naturally aspirated as first, always been keen to know what a n/a 20B would put out and was like to drive. Plus can't beat the sound of n/a. The computer I'm using is a Microtech LTX12. Exhaust is custom extractors to just before the diff then into a 3" pipe then into a single straight through stainless SelectMaz 3" muffler. I'm still using the diff gears I was using with the bridge port, 4.4s Excuse the dirty engine bay. http://members.optusnet.com.au/rotar...els2-small.jpg Click here for above pic http://members.optusnet.com.au/rotary20b/wheels2.jpg http://members.optusnet.com.au/rotary20b/20b-small.jpg Click here for above pic http://members.optusnet.com.au/rotary20b/20b.jpg http://members.optusnet.com.au/rotary20b/2-small.jpg Click here for above pic http://members.optusnet.com.au/rotary20b/2.jpg http://members.optusnet.com.au/rotary20b/3-small.jpg Click here for above pic http://members.optusnet.com.au/rotary20b/3.jpg http://members.optusnet.com.au/rotary20b/4-small.jpg Click here for above pic http://members.optusnet.com.au/rotary20b/4.jpg http://members.optusnet.com.au/rotar...otor-small.jpg Click here for above pic http://members.optusnet.com.au/rotary20b/3rotor.jpg http://members.optusnet.com.au/rotar...ries-small.jpg Click here for above pic http://members.optusnet.com.au/rotar...ncilleries.jpg http://members.optusnet.com.au/rotar...take-small.jpg Click here for above pic http://members.optusnet.com.au/rotary20b/intake.jpg |
...............wow...............
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using an FB front cover? thats sick.
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Exactly what I eventually want to do with mine. This begs many questions, including:
Which transmission are you using? How far back did the shift lever have to be moved? Can the slave cylinder still be changed out without lowering the trans or pulling the engine partially out? I'm not familiar with that differential. How does it compare strength-wise to stock? Any firewall modifications necessary? How difficult was it to get the 12A front mount to line up? Who about cost invested thus far? Again, very nice car and keep us posted re performance. |
aviator if u look, his front mounting system is custom, u can see the origional subframe a buncha inches back
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Originally Posted by Aviator 902S
Exactly what I eventually want to do with mine. This begs many questions, including:
Which transmission are you using? How far back did the shift lever have to be moved? Can the slave cylinder still be changed out without lowering the trans or pulling the engine partially out? I'm not familiar with that differential. How does it compare strength-wise to stock? Any firewall modifications necessary? How difficult was it to get the 12A front mount to line up? Who about cost invested thus far? Again, very nice car and keep us posted re performance. Not sure of exact measurement, will let you know. I believe so. It's a S3 diff, strongest of the first gens. Hopfully it will hold out a while. No modification to the firewall. Custom front cross member as shown below. http://members.optusnet.com.au/rotar...rossmember.jpg Cost.. around the 12k mark Australian ($9,000 USD) for engine, complete rebuild & porting, modifying of sump, new waterpump, computer, new S4 mounts, cross members, fuel pumps, radiator, gearbox, clutch, exhaust, thermo fan, modifying of gearbox, oil cooler, injectors cleaned, filters, oils, etc. complete. Thank you, will do :) |
Originally Posted by Elysian
aviator if u look, his front mounting system is custom, u can see the origional subframe a buncha inches back
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Anyone else have a 20B in a first gen RX-7?
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Originally Posted by Rotary20B
Anyone else have a 20B in a first gen RX-7?
http://www.msnusers.com/b17s34huh8oq...2FDSC00742.JPG http://www.msnusers.com/b17s34huh8oq...2FDSC00741.JPG |
awesome! let us know how it drives!
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That's incredible. I want more info! How in God's name did you get that in there? Where's the tranny compared to where it normally is? Did you have to shorten the driveshaft? Is it a stock tranny?
Man, I wish I was in Australia.. you guys are nuts. MY kind of nuts! Jon |
Originally Posted by vipernicus42
That's incredible. I want more info! How in God's name did you get that in there? Where's the tranny compared to where it normally is? Did you have to shorten the driveshaft? Is it a stock tranny?
Man, I wish I was in Australia.. you guys are nuts. MY kind of nuts! Jon Tailshaft is standard S3, part of the reason I decided to go with the 12A box first Yes, stock good cond. 12A Turbo gearbox. I was going to go a 13BT box, or a supra, but thought I'd give this a shot first, if it breaks I'll go either 13bt or supra. There's quite a few 20B in RXs over here. Think there's around 15 now, just in Brisbane. I was almost tempted to give up half way and go 13bt like everyone else, glad I didn't. |
So you've got the Diff, the tailshaft and the gearbox in *stock* location, and just attached the engine to it and figured out how to mount it?
That's awesome! There are *no* 20b's around here. Heck, I'd doubt if there were 15 on the continent! Jon |
Originally Posted by vipernicus42
So you've got the Diff, the tailshaft and the gearbox in *stock* location, and just attached the engine to it and figured out how to mount it?
That's awesome! There are *no* 20b's around here. Heck, I'd doubt if there were 15 on the continent! Jon 20B PP in a second gen, it used to race down at SIR. |
Is that an RX-3 front mount on your front cover? I see you had to drill new holes.
Your S4 motor mounts are a little close together for that kind of torque. Any plans to install a torque brace? |
Originally Posted by Jeff20B
Is that an RX-3 front mount on your front cover? I see you had to drill new holes.
Your S4 motor mounts are a little close together for that kind of torque. Any plans to install a torque brace? The mounts have been proven to work well on another setup. |
Originally Posted by Rotary20B
Anyone else have a 20B in a first gen RX-7?
But seriously ! i was about to get an FD ....and I saw your project!!!<<<<Guess whats going trhu my mind now!!!! ARGHH!!! how much money i expect to spend>? |
Originally Posted by TurboSE
NOT ME! But i want one now!!!DAMN YOU!!! <<<JK!
But seriously ! i was about to get an FD ....and I saw your project!!!<<<<Guess whats going trhu my mind now!!!! ARGHH!!! how much money i expect to spend>? Thats including parts & labor |
Perhaps there was some miscommunication. What is the mount that is bolted to the front cover? It resembles an RX-3 mount. It's what I used on my 20B. I think I will need a torque brace due to the narrow positioning of the motor mounts.
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Originally Posted by Rotary20B
Cost.. around the 12k mark Australian ($9,000 USD) for engine, complete rebuild & porting, modifying of sump, new waterpump, computer, new S4 mounts, cross members, fuel pumps, radiator, gearbox, clutch, exhaust, thermo fan, modifying of gearbox, oil cooler, injectors cleaned, filters, oils, etc. complete.
Thats including parts & labor |
My friend wants me to help him do a 20B powered GSL-SE.
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I wish I had never looked at this thread. Now I have to spend more money.
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Damn! Now I want to get one too. This sucks! more money lol =) How much HP dose a 3 Rotor Engine come with out mods?
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Originally Posted by TheLatinHeat
Damn! Now I want to get one too. This sucks! more money lol =) How much HP dose a 3 Rotor Engine come with out mods?
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