T-Rex86

I'm not doing it myself, but someone i sort of know claims he has a 20b in his FC. I want to know, how much is it to swap this engine in?

MtnRacer

It can be done for around $6000 if you do ALL the work yourself.

Steve

T-Rex86

Alright, thanks for the info.

j9fd3s

iTrader: (3)

i claim to have a 2b fc. its about a 10k project, depending on how you build it

mike

RX-Heven

iTrader: (1)

$6000 is a "little low", even if you do all the work youself and keep the mods VERY limited. A few people have done it for 10,000 or slightlty less. Expect 20,000+ to have someone else do it. I've got more than that into mine and I've done all the work myself so far except the engine build and I still have a VERY long ways to go.

RX-Heven

iTrader: (1)

Beat me to it j9...

j9fd3s

iTrader: (3)

hurry up! i wanna see that thing run.

btw we have your flanges

T-Rex86

ok i figured it was something like over 10 grand lol. Thanks for the info, now i can call BS on this guy and run him in my SR 240.Well hopefully he doesnt have it lol...

j9fd3s

iTrader: (3)

if this involves turns you'll lose no matter whats under the hood of the fc

T-Rex86

nope, no turns.Although i do auto-x so i like to think im an ok driver

1987RX7guy

iTrader: (3)

I think a good core for a three rotor goes for around 3k plus a rebuild you already have ~4k dollars. I think you were a bit low. Some people on here say it can be done for around 15-20k dollars. BUt most people with this done quote more around 30-45k dollars.

$150FC

If you already have a mild-to-heavily modded FC you've already got a lot of the components. Going from how my car is now to a 20B would basically only cost the price of the motor, a few fuel upgrades, turbo stuff, and a new standalone. (or about $6k, like we said)

MtnRacer

Yeah, yeah, I know was I low, sheesh. I've had 8 hours of sleep in the past 2 days and I forgot a few important details(like an intercooler, radiator, etc). I think if you penny pinched though, you could do it for under 10k, maybe 8-9k? Not ALL the parts have to be store-bought....

Steve

T-Rex86

What exactly makes the swap so expensive?I did my SR swap for about 3k lol. Is it just because its a rotary and it needs to be babied, like gettin everything in the car up to snuff? or The rebuild? or the aftermarket parts like IC's, standalones?

Obviously im not Mr.rx-7 lol. I have a FC but got it for a project. Dunno wut to do with it yet so it hasnt been touched.That and my 240 is taking all my money lol.

1987RX7guy

iTrader: (3)

Well like I said the engine alone is ~2500 and I would hope he rebuilds the core/j-spec. No matter what they say about mileage I am not beleiving them that it only has ~50k miles. A rebuild if the itnernals are perfect(rotors and housing etc) is around 1k+ depending on what you buy and replace. A standalone will run you atleast! 1-2k dollars for the cheaper systems.(I wouldn't go cheap) you will have to get a custom exhaust for it as the one for the FC might not be the proper size design, etc. Custom mounts have to be made to fit that sucker in there aswell. If there isn't a good IC on it that also has to be bought/made. Maybe even a Turbo upgrade also. Fuel for all of this will need some upgrades. The list goes on. I bet its all the little things that make the tag keep going into the 20k+ range

hpram99

ahh, I like to look at it this way:
pretend you had your car in the garage right next to a 20b cosmo.
1. Go open the hood to your rx-7
2. take a good long look at all the intricate components and the shitty vacuum lines and the, nevermind....
3. Ok, now all that stuff from step 2? Take it out.
4. and toss it out.
5. the repeat steps 2-3 for the cosmo.

THATS why it costs a lot more than just an engine.

SPiN Racing

Umm DOnt post a Lot.. But have to raise the BS flag here... (Was looking for a post with Cork SPort Exhaust sounds and saw this....)

Talk to Evil Aviator about the Cost of the 20B swap.

NO you CANT do it for under 10K. REMEMBER... you are talking... 10K... That would be AT BEST if you REALLY knew your ****... A STOCK 20B.. Non-Sequential.. with a Midas Muffler generic Custom Exhaust.. The Cheapest EFI you could Find.. The Cheapest Radiator you could Find.... to Fit Vertical... then there are the motor mounts you have to Buy/Fab... and we go into the Sway bar issue.. the Water Pump/Thermostats issue.. etc.. etc.. etc..

There is a LOT more to this than meets the eye. Yes You COULD do it for prolly 10K... BUT... WHY??? You would have a 300HP Max engine that prolly needs a re-build.. running Non-sequential etc. To get performance.. you need to undo all you did.. and do it right.. Which=Big $$

Not to be a kill joy... But yeah.. it will take money. And yes it can be done somewhat cheap.. But.. you get what you pay for. You would be better off spending 10K on a Crate 13B with a LOT of work and a aftermarket EFI. You would then WAX the 10K 20B project from Junkyard Wars.....

And for looks........ well.. Pop the hood on the 10K 20b and see all the work... eeh.... mediocre. The 10K 13B project Will be MUCH nicer.. cause you will have a lot more money available to get the right parts.

Anyhow... Going back to looking for the different thread

SPiN

sub9lulu

iTrader: (7)

http://fc3spro.com/TECH/SWAP/COSMO/20b.html

go to the 20b forum you will find way more info

T-Rex86

Ok i talked to the guy with the 20b today and im confused again. He says his motor is NA. I was under the impression that 20b's were twin turbo? Please help i know very little about rx-7's and rotaries obviously

Evil Aviator

20B is the block designation. The engine installed in the Japanese JC Cosmo is a 20B-REW, which has two turbochargers, and is the most common 3-rotor engine used as an upgrade to street cars. As you may know, just because an engine starts out life in one configuration, it doesn't mean that it will stay that way. The turbos can be upgraded or removed, the engine can be run non-turbo, or with a larger single turbo, or with a supercharger, or whatever anybody wants to bolt onto it.

There is a 20B Race engine available from Mazda Motorsports. It is non-turbo to comply with racing rules, and makes about 450-500hp. Of course, it is extremely expensive, and it would never be able to make full power on a street car due to noise levels, so it is not a likely candidate for a street car.

Additionally, a very skilled machine shop can make a custom 3-rotor engine using a lot of the regular 13B parts along with a few custom parts.

I have a feeling that this guy doesn't really have a 20B. Have him open his hood. A 20B has 6 spark plugs and a "3-cylinder" exhaust header. A regular 13B has 4 spark plugs and a "2-cylinder" exhaust header.