Building Peripheral Port housings
#426
Rotors still spinning
iTrader: (1)
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.
#427
Senior Member
iTrader: (1)
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...
#428
OBEY YOUR MAZDA
NOTE: Previous owner ported the **** out of the MFR housings
#429
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
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
#430
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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.
#432
spoon!
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...
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...
#434
Senior Member
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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
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
#435
The good thing about PP's are that they can be tuned to make power anywhere you want it.
#436
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.
Enjoy the videos.
Quest for 9's
http://videos.streetfire.net/video/a...9f001d9653.htm
Personal best. 10.04@130.64mph.
http://video.google.com/videoplay?do...89993962740345
Some in car video here. Check the oil pressure gauge.
http://videos.streetfire.net/video/w...7d003dab94.htm
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.
http://videos.streetfire.net/video/b...740074e603.htm
Crash vids.
http://www.savefile.com/files/649571
http://www.youtube.com/watch?v=5KgF2C8Rt9c
Last edited by crispeed; 06-21-07 at 02:47 PM.
#437
spoon!
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.
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.
#440
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?
#441
spoon!
Intake ports are plugged by filling with some sort of epoxy; Devcon being the most commonly cited one.
One piece seals... I thought that was just a bridgeport thing. Can't see how it wouldn't work with peripheral ports.
One piece seals... I thought that was just a bridgeport thing. Can't see how it wouldn't work with peripheral ports.
#442
Thats what I thought.
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?
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?
#443
Rotary Motoring
iTrader: (9)
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.
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.
#444
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.
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.
#446
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.
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.
#447
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.
#448
Building my car...
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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.
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.
#449
Building my car...
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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....
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....