dj_chaos007

hi i just was given a 87 rx7 N/A and the motor has 160k on it. i went searching through the forum to find out as much about engine swaps as i could but it still left me kinda confused. the main thing im confused about are the engine codes and horse power. from what i have read so far is i can swap a turbo motor from 86-88, diffrent turbo motor from a 88-91 or a 20b.

anyways my question is, is the information i have just stated correct?
and what are the engine numbers for the turbo models of these engines?
and what is a 20b, s4 , s5

i know thats alot of questions and im sry if i overlooked these in the forum or just didnt search hard enought but thanks in advance for any answers

vipers

iTrader: (8)

s4(zenki)= 86-88 rx7s

s5(kouki)=89-91 rx7s

yes, you can swap any of those motors into your car, you can also swap 13b-re's... those are alot easier than 20b's

13b-re and 20b-re motors are motors that came out of the japanese eunes cosmo which was never offered here in the states... the 20b is a 3-rotor whereas all the rest are just 2 rotor..... 20bs are very costly to swap, 13b-res are more feesable w/ plenty of opportunity for power.... the 13bt is by far the easiest swap.. it can be done in a day if you have the right tools and knowledge, 2-3 days for a shade tree mechanic.... you can swap an s5 motor into an s4 (most jdm motors are s5, since they are more popular)..but modifications are nescesarry... front cover has to be swapped due to the electric omp, throttle body has to be swapped back to s4 since tps sensors were different, and a few more things that im leaving out

the s4 13bt came w/ 186hp from the factory along w/ a twin-scroll turbo whereas the s5 13bt came w/ 200 and a different turbo

Twofer

Let me break it down a little...

Series 1 / S1 = 1979-1980 RX-7 (1st gen) (Chassis code: SA)
Series 2 / S2 = 1981-1983 RX-7 (1st gen) (Chassis code: FB)
Series 3 / S3 = 1984-1985 RX-7 (1st gen) (Chassis code: FB)
Series 4 / S4 = 1986-1988 RX-7 (2nd gen) (Chassis code: FC)
Series 5 / S5 = 1989-1992 RX-7 (2nd gen) (Chassis code: FC)
Series 6 / S6 = 1992-1995 RX-7 (3nd gen) (Chassis code: FD)

(For reference the RX8 is a SE, according to the VIN. Or FE by hearsay.)

Basically, you can swap engines between the same series without too much trouble. S4 NA to S4 Turbo.... S5 NA to S5 Turbo. S5 engines will bolt into S4 cars, but the wiring and other details are different. (Pain in the butt!)

2 rotor Cosmo engines (13b-RE Twin Turbo) will bolt up to 2nd Gen cars, but requires modification to the twin turbo system and wiring work. (Reted's site has a good writeup.)

3 rotor Cosmo engines (20b-REW) bolt up to 2nd gen transmissions but require custom engine mounts.

The "REW" designation means "Rotary Engine Double" (Twin Turbo).

The "13" in 13B is it's displacement. 1.3 liters. 12A = 1.2 liters and 20B = 2.0 liters.

References (INFO)
1st gen FAQ: https://www.rx7club.com/1st-generation-specific-1979-1985-18/1st-gen-rx-7-faq-page-237777/
2nd gen FAQ: https://www.rx7club.com/2nd-generation-specific-1986-1992-17/frequently-asked-questions-2nd-generation-rx-7-faq-fc-494667/
3rd gen FAQ: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/
RX-8 info: http://autos.yahoo.com > Mazda > 2006 RX-8
13B-RE info: https://www.rx7club.com/20b-forum-95/13b-rew-vs-13b-re-94984/
Conversions: http://www.onlineconversion.com/power.htm
JC Cosmo info: http://cp_www.tripod.com/rotary/pg09.htm
1st Gen info: http://www.geocities.com/MotorCity/S.../firstgen.html

References (SWAPS)
13B-RE swap: http://fc3spro.com/TECH/SWAP/COSMO/13b-re.html
13B-REW swap: http://fc3spro.com/TECH/SWAP/FD3S/rew.html
20B-REW swap: http://fc3spro.com/TECH/SWAP/COSMO/20b.html

One of these days I'll get bored and work on some stuff for the FAQ.

Icemark

that would be 1993-1996 model years for the S6
Think you got that backwards... The RX-8 Vin is FE.

The SE or SE3P is what the product is often called by people that don't pay attention to the Vin.

It was started in Japan by the tuners there (maybe some Japanese have trouble saying "F"s???).

Of course the SE also follows the Japanese nomiclature for the Rotary power sports cars

SA = SA
SB = FB
SC = FC
SD = FD
SE = FE

dj_chaos007

wow guys thanks the replys were extreamly helpful.

dj_chaos007

i read that the 13RE bolts directly to tho stock transmission the problem there is i have an auto transmission and i would like to swap that for a manual transmision. should i just buy a manual tranny from a s4 and then do the swap, or is there another tranny i should swap since im in the market for one anyway.

thx again 4 any help u guys can give

vipers

iTrader: (8)

s4 or s5 turbo tranny will be more than adequate... the only difference between the 2 were the 5th gears.... s4 had .762 ratio and 89-95 transmissions had a .719 ... other than that, there are no differences

Twofer

Hey you're right. That works for me. I probably remembered the SE (SE3P) from all the Best Motoring and Hot Version videos. You're also correct about the Series 6... I copied that from the 2nd gen FAQ without really reading it.

One question about the 20B, from what I looked up last night there is only the 20B-REW (Twin Turbo) and a 20B N/A Race P-Ported motor. Is there a production N/A 20B?

MaczPayne

iTrader: (5)

I don't think there were any Non-turbocharged 20B's produced.

Icemark

They built some non turbo 20B versions as test beds for the 10thAE and GTUs, but it is my understanding that they never put it in retail production even in Japan.

dj_chaos007

well im pretty much sold on the idea of a 13b-re (read the link posted by twofer witch was pretty helpful) with a tranny from a turbo s4. so i tryed 2 find a relyable source from witch i could buy these items. what are some ligit places to get the engine and the tranny from