NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)
-   Engine Swaps (https://www.nopistons.com/engine-swaps-35/)
-   -   What Is A 20b? (https://www.nopistons.com/engine-swaps-35/what-20b-11192/)

turborotor 01-29-2003 02:52 PM
http://members.tripod.com/~grannys/4rotor.html



Granny's shop, which makes v8 conversions for rx7s made a 4 rotor engine. Here is the link,

j9fd3s 01-29-2003 02:53 PM
i'll list the differences by housing.

front cover: looks like an 89+ fc

front iron: similar to an fc casting, except larger runners, and the front rotor tension bolt holes

rotor housings: 89 fc with a different exhaust sleeve

rotor: 89 turbo

2nd steel: double thickness of standard, it has an oil drain and a stationary gear

3 and 4 steels: similar to s5 t2, except larger runners and larger tension bolts.



mike

Racer X 01-29-2003 08:56 PM
Originally Posted by InfiniFC3S' date='Jan 29 2003, 12:37 PM
If I'm not mistaken, aren't the 20B ports larger than those of 12As and 13Bs? What the advantages be on using 13B housings? Just curious.
the biggest thing is the price of a 3 rotor 13 as opposed to 20B.Thats why the hitman did that.He wanted something on a budget that could take the high power levels on a daily basis.The biggest things needed is the custom e-shaft from austrailia and the 12a housing with stationary gear integrated into it.

Racer X 01-29-2003 08:58 PM
OH and a 13b 3 rotor needs a custom lower intake and exhaust manifold I forgot to mention that too.

r_xplicit 02-01-2003 02:22 PM
and all this time i thought someone revealed a bra size https://www.nopistons.com/forums/pub...#>/biggrin.png

drifter 02-03-2003 12:57 AM
Originally Posted by rx7machine' date='Jan 25 2003, 12:20 PM
If a 20b is the same thing as a 13b, but with an extra rotar, that means if I have 2 13b's i can build a 3 or maybe even a 4 rotor motor?

Ill just run it on an stand alone ecu of some type?

OR AM I JUST CRAZY
Yea, the 3 rotor and 4 rotor motors have been done before.. I guess you could make one yourself.. but alot of things come into play. The main thing that comes to mind is housing, but not sure.. https://www.nopistons.com/forums/pub...IR#>/dunno.gif

12a = 1.2 liters

13b = 1.3 liters

20b = 2.0 liters



i hope im right, please feel free to correct me if im wrong.



good luck building that motor. i see that happening real soon
That's correct. :bigthumg:
I know this is way down the thread now, but the 12a isn't 1.2L, its 1.1L. Well actually, its 1146cc which is rounded down to 1.1L. :bigthumg:


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