rotarygod

You could just theoretically swap them into a 13B with all the stock seals and have it work. I would buy new side seals from Mazda. They make a set which are longer so you can clearance them yourself. I would not use these in a Renesis though as the extra clearance is necessary to prevent seal breakage from carbon buildup. The 13B's don't have this problem to this extent.

I would also mill out the apex seal grooves deeper and then use 13B apex and corner seals. The Renesis corner seals have a new special coating on them which makes them very hard. These seals will chew up a 13B side plate in no time. The Renesis side plates have a different coating which is stronger so they don't get chewed up. The 13B corner seals can not be used with Renesis apex seals but they are the one's you'll need to avoid scrapping your engine in short time. Some have reported the Renesis apex seals to flex when crossing the 13B exhaust ports but others have reported them to work fine. My biggest concern is the corner seal wear.

By the time you mill out the rotors for the 13B seals, you will have spent the same amount of money as you would have if you had just bought the S5 RX-7 high compression rotors which require no special attention. Of course they aren't as light. The Renesis rotors have not been able to top the power of the RX-7 rotors in a 13B yet. The compression ratio difference is 9.7:1 vs 10.0:1. This isn't enough to matter in a rotary.

rotary crazy

Thanks for your help RG.

your completly right I call mi mecanic and he said the same thing as you , but he said that in his experience the renesis rotors give 20 more hp and 10 lbf of torque with some tuning, and this is what I saw at the engine dyno when my engine was put together, but not every one has the same luck with things.

drivelikejehu

ive heard this same exact thing. the peripheral exhaust suposidly chews up the seals. but as you did, i heard people both for and against that claim.

agreed also. although the renesis rotors are scalloped a little, you can buy already machined lightened and scalloped (much much more than that renesis also) S5 rotors. supposidly the heavily scalloped rotors on a street port make it sound like a full bridge port with no bridge! theres huge advantages to the scalloping theory, but it seems not TOO many people go that route. cool stuff though.

drivelikejehu

when you add air, you need to add fuel to keep everything happy.

someone else can explain this better... but im way too tired right now

rx8wannahave

^I forget, I've heard the same before...no need for more information...thanks.

But...the people who get the REVi intake consistantly have said they got slightly better fuel economy...

Maybe, it's just that it helps the air flow better into the engine...

rotarygod

Remember if you change the efficiency of the engine, it may take a different amount of air and fuel to make the same power. You only need a certain amount of air in relation to fuel to get a certain a/f ratio. This does not hold true to power though which is why you can get a mileage increase.

rx8wannahave

Ah ha....thanks

rotarygod

On a high overlap engine such as a peripheral port you need to run really rich at idle just to keep it going. Actually you need to ruch them farily rich almost everywhere. You gets tons of exhaust gas dilution at lower rpm's and loads which is devoid of oxygen and very hot. This hurts efficiency. You need to run lots of fuel just to get enough to combust well enough to keep them running. That's true with any engine really as that's how they run but in the case of a large overlap engine, they are very inefficent at low load and rpm levels. Higher rpm's and loads are different. This is where the inertia of the gasses tends to stay more in the proper direction and the overlap can even help build power. At full throttle a peripheral port will make more power almost everywhere in the powerband than an engine with less porting. This isn't terribly usable on the street though. If you drive around in the engine's rpm/load efficiency zones, you aren't going to get good mileage because you are flooring it everywhere. If you drive around like a regular street car, you aren't going to get good mileage because you'l be out of it's efficiency zone. It is physically possible to drive a peripheral port on the street. By some people's standards this means it is a streetable car. Of course we all know that a Formula 1 car can physicaly drive down the street and so can a Cessna airplane but I wouldn't consider them streetable because of it. Port overlap adds eficency at higher throttle settings but suffers at lower. That's the tradeoff. Mileage follows efficency at that load level. Most street driving is at fairly low loads which is an advantage to less overlap when it comes to efficiency.

rotary crazy

my perfect engine would be an engine that uses side ports for normal driving and when you go to wot and over an rpm point it opens peripheral intakes and exhaust ports so you get the drivability and economy of a renesis with the power of a PP.

Red Devil

^^^
The rotary version of V-tech...

drivelikejehu

alot of things would have to change in an instant for that to work without a huge delay from the time you stomp the pedal until you actually feel the car move. entire ports along the entire engine would have to shut and open in perfect timing, fueling and firing would have to change instantly, and the ecu would have to compensate for this huge change.

that would be so cool. it would have to be a FLAWLESS design though. possible if you have the time and money... but thats something better left to mazda IMO.

rotarygod

You're already got that!

tuj

Indeed, the 4 and 6 port engines are like 2 and 3 stage vtec, in that each set of ports effectively changes the intake opening and closing and total area ('lift').

rotarygod

This is what you guys are looking for.

Red Devil

D'oh, my mistake RG. I've even read your write-up before about the variable intake being our version of V-tech...

rx8wannahave

Ohhhh...we now have pic's, thanks RG...lol

Me learn good wit pics...

drivelikejehu

that picture is great! just remember the distance between the 1st and 2nd rotors is not proportional to the distance between the 2nd and 3rd rotors.

rotary crazy

it is the same in the 3 rotors kit they sell in new sealand, remenber it uses only 13b parts

rx8wannahave

BUMP!!!!

Long time no type....anything on this.....ANYTHING...lol.

peloponisios

Like the Handheld Flash Tuner thread.... Patience what else?

rx8wannahave

^yeah, but lately there is NOTHING to report on anything it seems. The site has been rather dead lately...

Renesis_8

I disagree, its been rather alive in the MAJOR HP SECTION With the SUPraAaaaaaa EIght, maybe the supra guy convinced all of us rotor heads that 2JZ owns 3 rotors... maybe drivelikejehu should make a skyline 8 instead of 3-rotor renesis =d

hahahahaha

edit: i meant the aftermarket section
________
SensualJessica

BaronVonBigmeat

no, he should do a 3-rotor-renesis powered Supra, ha ha

rotary crazy

lol

Aseras

more air = more fuel needed to get the correct A/F ratio.. The quicker you burn fuel, the more energy you have and therefore more HP and Torque..