N/A 20b build

aaron_bc · 06-15-2010, 07:02 PM

I wonder what I could even get out of fully stock block with ITB's?

Hrmmm... maybe I should to that FIRST to get the car up and running, set up the way I want then get it built for more power?

RETed · 06-16-2010, 11:42 AM

Mazda Competition (now Mazdaspeed) used to sell "race bearings"...
Guess what they were?
Stock Cosmo bearings...which your 20B already has.
These are the "3 window race bearings" that you see.
I believe Racing Beat sells them as such also?

The only better bearings are the stock FD ones which are "9 hole" bearings and, I believe, deeper groove?

Sorry, I can't recommend anyone for your 20B build.
I do all the work myself.

-Ted

project86 · 06-16-2010, 12:13 PM

Quote:

Originally Posted by RETed

Mazda Competition (now Mazdaspeed) used to sell "race bearings"...
Guess what they were?
Stock Cosmo bearings...which your 20B already has.
These are the "3 window race bearings" that you see.
I believe Racing Beat sells them as such also?

The only better bearings are the stock FD ones which are "9 hole" bearings and, I believe, deeper groove?

Sorry, I can't recommend anyone for your 20B build.
I do all the work myself.

-Ted

I think the reason they were talking about race bearings is because they were gonna build a 3 rotor istead of using a 20B block to start with. Just FYI

sending you a PM btw

aaron_bc · 06-16-2010, 03:45 PM

Quote:

Originally Posted by RETed

Mazda Competition (now Mazdaspeed) used to sell "race bearings"...
Guess what they were?
Stock Cosmo bearings...which your 20B already has.
These are the "3 window race bearings" that you see.
I believe Racing Beat sells them as such also?

The only better bearings are the stock FD ones which are "9 hole" bearings and, I believe, deeper groove?

Sorry, I can't recommend anyone for your 20B build.
I do all the work myself.

-Ted

You interested in building mine?

RETed · 06-17-2010, 05:07 AM

Quote:

Originally Posted by aaron_bc

You interested in building mine?

Interested?
Sure.

You do know I'm from Hawaii, right?

-Ted

gmonsen · 08-15-2010, 11:10 PM

Sounds like a good general plan to me. I would suggest you go with a 90mm throttle body instead of ITB's with a large street port. The street port runs out of steam at around 7500 rpm. You are totally constrained by the stock throttle body. There are plenty of 90mm throttle bodies you can mate to the intake. You should be able to make close to 350 with that. If you want to go higher, you really want to go pport (or semi pport)and ITB's.

Gordon

GtoRx7 · 11-08-2010, 10:11 PM

Late to the thread, but figured I would throw in some info. I have been doing 20b n/a R+D for over 6 years, and over the past 6 months its really coming together. This is mostly to put a bunch of facts on the board. And to produce some of the most powerful n/a 20b's in the world for my customers (Christopher is a big one that comes to mind!)

Proven 313 rwhp 20b spec sheet-

20b with our circuit port on intake and exhaust
USED not new 9.7:1 rotors
Balanced assembly
Stock 20b stationary gears and bearings (identical to fd bearings)
110psi regulator
new stock oil pump
Our stainless 20b equal length header
Stock intake manifold, shortened stock lower manifold
Standalone of your choice
3" exhaust from header back
8000rpm
Stock apex seals
stock used rotor housings

Thats it, good to go. If you want 350rwhp+ we have done this as well, and I can help guide you in the right direction from facts and actual results.

08-15-2010, 11:10 PM	#6
gmonsen The Ancient One Join Date: Mar 2008 Location: Eastern Pennsylvania Posts: 144 Rep Power: 18	Sounds like a good general plan to me. I would suggest you go with a 90mm throttle body instead of ITB's with a large street port. The street port runs out of steam at around 7500 rpm. You are totally constrained by the stock throttle body. There are plenty of 90mm throttle bodies you can mate to the intake. You should be able to make close to 350 with that. If you want to go higher, you really want to go pport (or semi pport)and ITB's. Gordon __________________ 1993 Rx7 R1 20b NA 1994 Rx7 20b supercharged project 1991 BMW 850 6 speed 1991 BMW E30 M3 Evo II

11-08-2010, 10:11 PM	#7
GtoRx7 Rotary Fanatic Join Date: Jul 2008 Posts: 151 Rep Power: 18	Late to the thread, but figured I would throw in some info. I have been doing 20b n/a R+D for over 6 years, and over the past 6 months its really coming together. This is mostly to put a bunch of facts on the board. And to produce some of the most powerful n/a 20b's in the world for my customers (Christopher is a big one that comes to mind!) Proven 313 rwhp 20b spec sheet- 20b with our circuit port on intake and exhaust USED not new 9.7:1 rotors Balanced assembly Stock 20b stationary gears and bearings (identical to fd bearings) 110psi regulator new stock oil pump Our stainless 20b equal length header Stock intake manifold, shortened stock lower manifold Standalone of your choice 3" exhaust from header back 8000rpm Stock apex seals stock used rotor housings Thats it, good to go. If you want 350rwhp+ we have done this as well, and I can help guide you in the right direction from facts and actual results. __________________ DEFINED AUTOWORKS Where concept meets results Black 1994 FD 4-rotor 610rwhp all motor Red 1970 Mazda R-100 with 10a Black 1974 Mazda Rx4 Black 1984 Gsl-SE 13b-re streetport 230rwhp

06-15-2010, 07:02 PM	#1
aaron_bc Rotary Fan in Training Join Date: Mar 2009 Posts: 33 Rep Power: 0	I wonder what I could even get out of fully stock block with ITB's? Hrmmm... maybe I should to that FIRST to get the car up and running, set up the way I want then get it built for more power?