20B Rotary - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Staf00 · 01-27-2015, 04:44 AM

So why hasn't anyone dabbled with the idea of doing a 3 rotor 20B? I know it would be hella expensive, but that doesn't mean we can't discuss the how-to aspect of it. I mean it's compact, light-(ish), and high revving...wut's not to like? Someone here's gotta at least thought about this at one point or another right? I'm assuming an adapter plate would be required. Also, anyone know the weight of a 20B? What if aluminum side housings were used? Preferences?: N/A, Turbo, Twin Turbo, Rotrex, Twincharge? lol. I figure if someone is gonna dump this kind of money for such a build, wouldn't they go all out?

raven1231 · 01-27-2015, 06:13 AM

Well needing to dump oil in the engine on a daily basis may be a turn off for some. Or getting 3 miles to a gallon. Then there is the low torque that the boxer already suffers from. Going to a rotary won't help that either.

Teseo · 01-27-2015, 07:04 AM

There are plenty of threads about the idea of doing that op.

ZDan · 01-27-2015, 07:15 AM

Quote:

Originally Posted by raven1231

Then there is the low torque that the boxer already suffers from. Going to a rotary won't help that either.

20B rotary puts out about 50% more torque vs. 2.0 liter piston engine.

raven1231 · 01-27-2015, 08:01 AM

Quote:

Originally Posted by ZDan

20B rotary puts out about 50% more torque vs. 2.0 liter piston engine.

Does it suck at holding boost as well?

Shit Luck · 01-27-2015, 10:14 AM

I toyed with the idea...
unfortunately I have to pass emissions where I live so I would have to make the ecu read it...
that is what kept me from trying this swap for now.

swarb · 01-27-2015, 01:08 PM

you're either into rotary or you're not. people don't want to experiment with their money. for the same amount of work, you could/would get something more reliable/tested/proven, aka 2j, ls, etc?.

TEDDER1 · 01-27-2015, 01:21 PM

I just did an LSx swap on my rx7 instead of the 20B.

Now I get 30+mpg while having 500whp/500whtq.

raven1231 · 01-27-2015, 02:08 PM

Quote:

Originally Posted by TEDDER1

I just did an LSx swap on my rx7 instead of the 20B.

Now I get 30+mpg while having 500whp/500whtq.

and get the same gas mileage

TEDDER1 · 01-27-2015, 02:20 PM

Wait are you making fun of something I said or agreeing? lol

As much as I still like rotaries, theyre just not practical.

BUT, IF I hit the lottery, I would get an N/A 4 rotor PP, and put it in an SLC kit car.

Again if money was of abundance.

hmong337 · 01-27-2015, 02:36 PM

Quote:

Originally Posted by TEDDER1

Wait are you making fun of something I said or agreeing? lol

As much as I still like rotaries, theyre just not practical.

BUT, IF I hit the lottery, I would get an N/A 4 rotor PP, and put it in an SLC kit car.

Again if money was of abundance.

Rcr Slc. A dream car of mine! I'll take one with a Lexus V8 TT though.

rlpaul · 01-27-2015, 02:38 PM

I like the 20B a lot, one of my favorite engines. That said, the only chassis I've ever thought about putting it in is an FC RX-7. Still would like to at some point if I have the garage space and extra funds lying around...

I briefly thought about what it'd be like to put a 20B in the 86 chassis, but not seriously. While the FA20 isn't the best sounding engine, I have no serious complaints about its capabilities at this point. I think other engine swaps, such as the LSx or 1UZ have a lot more to offer than the 20B.

cdrazic93 · 02-02-2015, 01:46 AM

Quote:

Originally Posted by rlpaul

I like the 20B a lot, one of my favorite engines. That said, the only chassis I've ever thought about putting it in is an FC RX-7. Still would like to at some point if I have the garage space and extra funds lying around...

I briefly thought about what it'd be like to put a 20B in the 86 chassis, but not seriously. While the FA20 isn't the best sounding engine, I have no serious complaints about its capabilities at this point. I think other engine swaps, such as the LSx or 1UZ have a lot more to offer than the 20B.

that is under the guise of being boosted, 26B rotaries can be one hell of an engine with about 500 whp NA that revs like a golf cart.

http://www.definedautoworks.com

idk about you but thats $39,925 well spent for 630 plus hp.

lol thats the 3rd time Ive posed their website

M23 · 02-02-2015, 02:06 AM

I don't know jack sht about rotaries. But, what are the whp levels for each of these setups: 1-rotor NA, 2-rotor NA, 3-rotor NA??

Or, do those (1, 2 or 3 rotor) not exist in NA form, and have to be FI to pull of any decent numbers?

01-27-2015, 04:44 AM	#1
Staf00 Member Join Date: Mar 2013 Drives: SWP DZE Location: SoCal Posts: 31 Thanks: 12 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	20B Rotary So why hasn't anyone dabbled with the idea of doing a 3 rotor 20B? I know it would be hella expensive, but that doesn't mean we can't discuss the how-to aspect of it. I mean it's compact, light-(ish), and high revving...wut's not to like? Someone here's gotta at least thought about this at one point or another right? I'm assuming an adapter plate would be required. Also, anyone know the weight of a 20B? What if aluminum side housings were used? Preferences?: N/A, Turbo, Twin Turbo, Rotrex, Twincharge? lol. I figure if someone is gonna dump this kind of money for such a build, wouldn't they go all out? Last edited by Staf00; 01-27-2015 at 05:09 AM.

01-27-2015, 06:13 AM	#2
raven1231 Senior Member Join Date: Aug 2013 Drives: 2013 Firestorm FR-S, 2016 DGM WRX Location: Cincinnati, Ohio Posts: 4,580 Thanks: 8,264 Thanked 3,118 Times in 1,667 Posts Mentioned: 24 Post(s) Tagged: 1 Thread(s)	Well needing to dump oil in the engine on a daily basis may be a turn off for some. Or getting 3 miles to a gallon. Then there is the low torque that the boxer already suffers from. Going to a rotary won't help that either. __________________ http://www.ft86club.com/forums/showthread.php?t=59870

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01-27-2015, 07:04 AM	#3
Teseo Senior Member Join Date: Jun 2014 Drives: frs Location: Gunsai Posts: 4,877 Thanks: 7,146 Thanked 2,922 Times in 1,769 Posts Mentioned: 23 Post(s) Tagged: 2 Thread(s)	There are plenty of threads about the idea of doing that op.

01-27-2015, 10:14 AM	#6
Shit Luck Senior Member Join Date: Oct 2012 Drives: red frs Location: pa Posts: 1,031 Thanks: 244 Thanked 229 Times in 140 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	I toyed with the idea... unfortunately I have to pass emissions where I live so I would have to make the ecu read it... that is what kept me from trying this swap for now.

01-27-2015, 01:08 PM	#7
swarb Senior Member Join Date: Sep 2014 Drives: BRZ Location: Los Angeles Posts: 3,053 Thanks: 1,773 Thanked 2,451 Times in 1,271 Posts Mentioned: 79 Post(s) Tagged: 0 Thread(s)	you're either into rotary or you're not. people don't want to experiment with their money. for the same amount of work, you could/would get something more reliable/tested/proven, aka 2j, ls, etc?.

01-27-2015, 01:21 PM	#8
TEDDER1 Killer For Hire Join Date: Dec 2014 Drives: 93 Rx7 LSx 383 Location: Orlando Posts: 10 Thanks: 0 Thanked 14 Times in 7 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I just did an LSx swap on my rx7 instead of the 20B. Now I get 30+mpg while having 500whp/500whtq.

01-27-2015, 02:20 PM	#10
TEDDER1 Killer For Hire Join Date: Dec 2014 Drives: 93 Rx7 LSx 383 Location: Orlando Posts: 10 Thanks: 0 Thanked 14 Times in 7 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Wait are you making fun of something I said or agreeing? lol As much as I still like rotaries, theyre just not practical. BUT, IF I hit the lottery, I would get an N/A 4 rotor PP, and put it in an SLC kit car. Again if money was of abundance.

01-27-2015, 02:38 PM	#12
rlpaul Senior Member Join Date: Oct 2014 Drives: point A to point C. Screw point B! Location: NC Posts: 228 Thanks: 30 Thanked 139 Times in 87 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I like the 20B a lot, one of my favorite engines. That said, the only chassis I've ever thought about putting it in is an FC RX-7. Still would like to at some point if I have the garage space and extra funds lying around... I briefly thought about what it'd be like to put a 20B in the 86 chassis, but not seriously. While the FA20 isn't the best sounding engine, I have no serious complaints about its capabilities at this point. I think other engine swaps, such as the LSx or 1UZ have a lot more to offer than the 20B.

02-02-2015, 02:06 AM	#14
M23 Banned Join Date: Sep 2014 Drives: 86 Location: Penisville SoCal Posts: 344 Thanks: 197 Thanked 88 Times in 58 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I don't know jack sht about rotaries. But, what are the whp levels for each of these setups: 1-rotor NA, 2-rotor NA, 3-rotor NA?? Or, do those (1, 2 or 3 rotor) not exist in NA form, and have to be FI to pull of any decent numbers?

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