Here is a picture of a new, larger streetport I am using on my latest rebuild. I only hit 452hp on my last version, and hope this porting will help me extend beyond that number. I have extended about 3/8" beyond the last porting job -- being very careful with the water jacket. As you can see, I did not extend towards the corner seal to any great extent, but might get bored and start grinding some more if other parts I am waiting for do not show up soon! (2 Months of waiting for COMMON parts... ugh!) For reference, the stock port roughly covered the area that is in the shadows of this picture.

 

Nice work, do not forget to make your primary the same closing timming as that secondary port.

Also the same goes for the opening timming, make both the primary and the secondary open at the same time, this is governed by the edge of the port closest to the o'ring groove, from the inner edge of this groove to the edge of the port should be no less than 11mm to be safe, or if you put the rotor housing on the side plate and lightly scribe the inner edge onto the plate the distance to the opening edge should be no less than 7.5mm maximum. Any less than this and the leading edge of the side seal will drop into the port and fail.

Making primary and secondary ports the same timming will give heaps more mid range and top end power, you do loose a small amount of low end due to lower air speed at low rpm from greater duration. That is basically what my intake ports are like...oh and make the exhaust ports LARGE too

Regards

 

my porting

 

primary port

 

Rice,
Is that the exhaust port on the lower right in your first picture!? ...sorry I don't know much about rotary ports but that thing is huge!

 

Yes, I have been told "a few times" that it is large.

Oh, the exhaust port ! Yes that is large too

 

exit13B:
nice looking work

 

Hey, what are the specs of that port, and how safe is it? Probably really safe when run properly judging by your posts. What type of power are you putting down, and what are the power-adders? Thanks.

Spyder420
Id rather have an FD over a woman because an FD can give you a kick in the ***, but a woman can give you a kick in the *****.

 

RR, your exhaust porting is more agressive than mine! I should have taken a picture before I sealed things up last night. I am still waiting on the rear housing, so the entire engine is together except for it -- so I might be able to take a picture. I am scared to have more exaust duration for the turbo's sake! I have a Turbonetics Q-Trim, which is manufactured by TIG welding additional material to a P-Trim, and then grinding and balancing. This wheel is a bad choice for 'blow-torch' rotaries that tend to erode the additional material. It is accelerated by agressive port timing even more, since the wheel is exposed to more direct flames! (Wouldn't it be cool to have a VIDEO looking up the exhaust into the turbo?? ) <br>
Yes, I have been waiting 2 MONTHS for a rear housing!! I won't name the vendor, but I am sooooo angry. The first one that arrived was NON-TURBO, and now I am waiting again.... all in an effort to save a buck... arghh.. I finally got impatient and started assembly last nigh, sans rear housing! It will probably sit in this condition for another week before the housing arrives. If I get bored, I might pull it back apart and port some MORE! Rice Racing, how do you like the BP on the F&R housing only? I must tell you I was tempted to do it last night, but felt an extreme urge to move forward with the project. I am still tempted to try it out!<br>
Mods List? I'll list two versions: pre-current rebuild, and after current rebuild.

Original Setup:

Produced 452HP @ 15PSI. Killed by EVC I stepper motor which failed on the dyno; boost went to infinity, which caused multiple vacuum lines to pop off, namely the FPR line. Bad combination. Estimated 30PSI with no additional fuel. I was logging on the TEC, and had a broadband -- but this happened INSTANTLY, and there was no time for reaction. Cracked the rear housing at the tension bolt below the oil filter -- a weak point on the engine at high HPs. All internals were fine; no cracked apex seals, etc -- just lots of OIL spraying from the side of the engine <br>

Engine:
Street Ported 13B w/3MM seals (Mazda)
'87 low compression rotors, balanced assembly
3 Window main bearing, tapered eccentric, oil bypass mod
Hardened stationary gears
RB Oil Pan Baffle

ECU:
Electromotive TECII with pafz2g, split timing ROM
HKS ECV I - (Blown up, and took my engine with it!)

Turbo:
Turbonetics T04 Bigshaft Q-Trim exh/H-Trim comp
Tri-Point Manifold
HKS Wastegave/BOV
Spearco Core with custom end tanks, custom 2 1/2" piping
Custom 4" downpipe -> RB Exhaust
Tilton external oil pump on return line (turbo sits low!)

Fuel:
Factory tank - Sumped with dual 1/2" outs, and re-lined
Bosch inline fuel pump, rated 500HP (not quite!)
1/2" Stainless supply/return to -8 under hood
SX FPR
Injectors: (4) 550's, (2) 720's (alt, simultaneous! - not staged!)

Driveline:
Lightweight Steel Flywheel (cracked it!)
ACT 6-Puck
TII Tranny (Also junk - spreads linkage above ~400HP)
Custom Driveshaft
Torsen LSD
BFG Drag T/A
Hurst Line Lock

Etc:
SRX7 Aluminum Radiator
Black Magic 2800cfm electric fan
RB Dual underdrive pulleys
Gauges: Boost,h20 Temp, Oil Pres, Fuel Pres, EGT, A/F


New Setup:

Engine changes:
BIGGER Streetport
Water jacket modification

ECU Changes:
Electromotive TEC II, with WinTec II upgrade
Custom injector staging using SSR's to drive secondaries
APEXi AVC-R
T-Handle mounted Linelock / Scramble boost button
(Will lower boost during linelocked burnout)
Broadband 02 w/emulation to TEC for logging

Fuel changes:
Weldon 2015 Fuel Pump 107GPH @ 40 PSI!
All lines upgraded to -8
Paxton inline fuel filter
Nitrous Oxide (NOS, wet); 50 to 60 shot initially
Injectors - (2) 720's + (2) 1600's

Driveline Changes:
Pro-Shifted Richmond 4+1 Sequential Transmission
(aka, Doughnash)
Long Verti-Gate Shifter
G-Force Straight-up TII 4" adapter (nice piece!)
Custom Chrysler 727 to TII pinion driveshaft
One Rx-7 with a giant hole cut in tunnel to accomodate above.
(I'll post pictures in another thread or reply!) '
SRX7 9.5# Aluminum Flywheel
ACT 4 Puck


I am omitting a TON of details that are either obvious, negligible, or forgotten! Here's a pic of the old setup: