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The Mazda factory p-port housings go straight in from the side and the Racing Beat housings go in at a downward angle. When I talked to David Haskell from Speedsource last year at Sevenstock about their 3 rotor RX-8 race car, he said that they found in testing that the Mazda housings made slightly more peak power but the RB housings made more average power. There is more different between them than just the angle of the porting though. The RB housings constrict slightly as they go into the engine in a sort of venturi shape. The angle itself doesn't seem to be very critical as long as everything else is done nicely.
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"Torque is a variable. Horsepower is the answer!"
"If you aren't testing, you are guessing."
"Cheap usually costs more and rushing things usually takes more time."
i have made many peri port engines like this before using the same method..they work just great, I dont know if my racing beat housings are any less or more than my zig budget specials....i know i misssed a few pages here jjust letting you guys know i have done this and it works fine..........actually i used a cheap drill press my first time..LOL what fun that was...
I know the r26b housings are specially made. But I figure a hole is a hole, and I wasnt sure with that angle what the port timing they had figured it to be
I used my MFR housings as a "template", a few milimeters below center of the water passage block-off is pretty damn close to the MFR holes.
NOTE: Previous owner ported the fuck out of the MFR housings
I love this thread. it is everything I love about the rotary world
I was just having a crazy idea the other day. Is there any way to use the original side ports, not as intake, but do a form of direct injection? obviously it would take a lot of tuning, fabrication, and a standalone, but direct injection seems to be where engines are going these days. At the same time you could also think about using it for direct injection for water/alcohol while running a turbo. or you could have both.
as I said it's just an idea, I haven't really thought it through
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"Don't quote me boy, I ain't said sh*t" - Easy E
I used my MFR housings as a "template", a few milimeters below center of the water passage block-off is pretty damn close to the MFR holes.
NOTE: Previous owner ported the fuck out of the MFR housings
what the fuck was that guy doing with that housing?
I woulda have loved to have seen the dyno on that thing, no power before 9k.
I also wonder what the VE on a motor with ports like that looks like.
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88 Black Turbo II - 150 rwhp @ 7500 rpm - Corksport 80mm DP, Corksport 80mm MP, HKS SSQV, S5 turbo upgrade, FCD
Coming soon - Standalone and a LOT more boost and fuel. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
91 Blue CRX - Beater
94 Green Corolla Station Wagon - Absolute Race Car
What do you mean? That's a stock Mazda peripheral port housing.
Yeah... actually, it looks about what the baseline in that paper I keep flaunting was (IO 100BTDC, IC 75ABDC) which puts the torque peak around 7.5-8k RPM. Incidentally, it's also rather bigger than the numbers Yaw has on his site... hrrm.
Question. I've heard talk of at least two different styles of MFR housings (qualifying with more square ports, race with rounder) and I've come across at least three different port timing configurations... anyone have any data on when the various setups were run? Were the MFR housings supplied as-cast to people and then various teams did their own porting setups on them? Well, okay, rather did Mazda provide data on where to port to; I know that Downing at least makes mention of reworking the MFR housings.
'course, there's the NA drag guys who keep occasionally making vague comments about port sizes and horsepower levels that came from developing far past MFR bits, but I don't think any of them are going to talk about their setups in detail...
Wow, sorry then, I have just never really gone to much into PP housings.
Nice stuff there.
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88 Black Turbo II - 150 rwhp @ 7500 rpm - Corksport 80mm DP, Corksport 80mm MP, HKS SSQV, S5 turbo upgrade, FCD
Coming soon - Standalone and a LOT more boost and fuel. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
91 Blue CRX - Beater
94 Green Corolla Station Wagon - Absolute Race Car
square ports are used on endurance races bringing peak HP at about 8.5 to 9 k
round or oval ports are used for sprint or high rpm aplications such as short road course...port timing depends on fuel mixture but generally it is about 20 10..on the newer housings that may be different and as i said fuel and stuff too willl make a differnce
NA drag guys who keep occasionally making vague comments about port sizes and horsepower levels that came from developing far past MFR bits, but I don't think any of them are going to talk about their setups in detail...
It's not that they don't want to talk about their setups but the level they are at it takes takes a lot of time and dedication not to mention money and R&D to get there. The NA dragracers dont have anyone else to a certain point to hand them the combination on a platter. The NA dragracers are the ones that are willing too and are taking it to the next level. Mazda was very nice in supplying the public with a MFR PP rotor housing that had most of the early R&D done for you allready. There's notting the NA dragracers are doing that no one else can do but thinking you will come on a forum or read about it in some factory racing, preperation manual then you're wrong. Eventually as time go by what is being done today by the NA drag guys would be probably the norm tommorow for the general public. Instead of relying on what Mazda and a couple of other racers/companies have done 20 yrs ago go out there for yourself and firgure out what it takes to take it to the next level. Look at what Speedsource did. They went out with what's available on the market today and developed it to suit their needs. That's the best way to do it when you have no prior experience with the said combination. Now to take it to the next level that's where the hard work starts. When I visted Seedsource shop so time ago and after speaking to a certain individual there for some length of time he was quite surprised at the power level I could acheived with a PP motor on the very same type of dyno they use for thier own cars. He was also surprised when I nailed the exact power levels they were at because I've been there with the same very combination before. It's all proven technology available to the general public anyway.
When I first started messing with PP motors I never knew what I did today and never thought we could acheived the results that we do now back in the beginning.
Here's a little hint. Stop concentrating on exact port timing and size because that mainly affects the powerband but not the power/torque level you can acheive if you concentrate on intake and exhaust tuning. Port timing is not to make more power and I don't consider peaky motors as powerfull motors because that's just a number on a dyno sheet because in the real world you have to concentrate on the entire poweband the motor has to operate in. You guys would be surprised as to how similar the port timing and port dimensions that the NA dragracers are using to what's shown above in the pics. No secret there. The secret to making over 350rwhp/180rwtq on a two-rotor lies elsewhere and that power level is considered as average among the top NA drag guys. I've seen a particular 13B PP motor make close to 380 RWHP something which I never thought would have been possible a couple of years ago. Do the math if you don't believe me. Look at the times the top NA dragracers are doing an plot it into a simple calculator.
Long in car video of a test pass. Video showing important gauges. Run was done without the two step and too low of a launch rpm which resulted in a huge bog off the line all of which can be seen in the video.
It's not that they don't want to talk about their setups but the level they are at it takes takes a lot of time and dedication not to mention money and R&D to get there. The NA dragracers dont have anyone else to a certain point to hand them the combination on a platter. The NA dragracers are the ones that are willing too and are taking it to the next level.
*nod* I'm sorry if what I said sounded like I was bashing the drag guys... I didn't mean it that way. I really have to respect the work that some are doing in advancing these things; I'm a relative newbie and there's obviously no reason to expect to be handed this stuff on a platter.
I'm an engineer; my way of thinking is trying to figure out how Mazda developed the things in the past to provide a guideline on where to develop to, y'know? In boinger terms... I can look at where 4-valve stuff has developed through production stuff and older racing parts, and while I can't get a look at current F1 bits either I can maybe make some educated guesses what directions they developed in. Maybe come to some better guesses on where to start tinkering (or maybe not!) before it gets to cutting metal.
I appreciate the hint on where to look though... I'm really going to have to just start making dyno mules.
Thanks for the vids too... that seems like... uh... rather more oil pressure than I'm used to seeing at idle.
Stupid question- After pporting the housings, what do you do with the original primary and secondary ports in the irons? Do you just plug them up and if so how? Thanks
This is a very interesting thread. Another question for you. I have read that you have to run 1 piece apex seals with a PP is this true? If so why? They can cope with passing over the exhaust ports why can`t they cope with the PP?
My idea at the moment is to keep the Primary ports (Street ported) block the secondaies off and run PP instead of the secondaries. This would be on a 13bREW with a GT42.
I would run the PP as high as possible without interferring with the oil injectors but what sort of diameter port? I was thinking of something like 1.5" or 1.25" any ideas?
Several Japanese shops sell lower intake manifolds and rotor housings to do exactly what you are planning- primary sideport and 2ndary converted to P-port.
They also have lower intake manifolds and rotor housings for primary sideport, 2ndary sideport and a small tertiary P-port off of the 2ndary runner.
I saw these in the products section of a Japanese RX-7 Magazine.
Several Japanese shops sell lower intake manifolds and rotor housings to do exactly what you are planning- primary sideport and 2ndary converted to P-port.
They also have lower intake manifolds and rotor housings for primary sideport, 2ndary sideport and a small tertiary P-port off of the 2ndary runner.
I saw these in the products section of a Japanese RX-7 Magazine.
I had seen the semi PP that scoot had (both sideports and small peripheral) I didn`t know anyone had done what I wanted to but thanks for the heads up, guess I`ll keep searching and see if I can find more.
Several Japanese shops sell lower intake manifolds and rotor housings to do exactly what you are planning- primary sideport and 2ndary converted to P-port.
They also have lower intake manifolds and rotor housings for primary sideport, 2ndary sideport and a small tertiary P-port off of the 2ndary runner.
I saw these in the products section of a Japanese RX-7 Magazine.
I would like to see some Links or names to look up.. Interesting idea.
I would like to see some Links or names to look up.. Interesting idea.
Check this thread out.--> http://www.ausrotary.com/viewtopic.php?t=115759
Lot's of pics in there of different setups. If you thought you were confused before after reading that thread you will be even more.
PP+Primary ports.
Stock MFR PP housings.
Modified PP housings.
Semi PP Jaytech Intake Manifold.
Semi PP Factory FD type intake manifold.
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CRISPEED Rx-7 9.204@150.47
TRAVIESO RACING Rx-3 10.04@130.86mph ALL MOTOR
AWD MOTORSPORTS 8.75@163EVO8 GSR E85
AD TURBO 2JZ S2000 8.69@163 E85
CHARLES/RAW 2JZ S2000 8.7213@157
BIG DADDY PERFORMANCE SUPRA's MKIII 8.70@170/MKIV 7.95@180
Good god ,ausy bastards...stealing Paul Yaws pictures.... I learned all of my race secrets from Paul and to say the least, it makes sick power in any application if done right.(that is the secret( go just a hair and you will not run right...hahahaha I love that.
So anyway www.yawpower.com you can find the port pictures I am talking about. Look at azrotaryrockets.com in the about us section and see the car.
Any way cool site I was just kidding around in the above post but ....Yes azrotaryrockets is Paul Yaw's aprentise Glen Weaver .... Cool P ports check out azrotaryrockets soon for new pport tech.......
Pics I was talking about in above post.
Oh and the last one is azrotary rockets extreme race port next to a fd3s stock port after Paul trained a bitch meaning me....
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