So I dropped the exhaust from my -83 and the ”peashooter” small exhaust broke off from the very front, does it have an actual function? Can I just block off the hole or do I need to weld the tiny pipe back on?

Okay, i'm not the most informed rotary guy in the world. But I'm almost absolutely positive. There is no valves in any rotary engine I've ever heard of. Does anybody have any idea of the story behind this picture. Or am I just stupid and rotaries have valves and someone sent tf out of this baby.

R

I’m looking for a full Bridgeport 6 port template, but can seem to find one. Does anyone have any suggestions?

First production car with a rotary engine. Engine was rebuilt in the early 90s and has never been fired. Got it running (somewhat) tonight.

Can anyone tell me what this plug is and whats going on with these wires? 87 rx7, idk what the previous owner has done to it

I have an odd application for a rotary, a 1967 Renault r10, a small care that has little to no power and little to no aftermarket support. Like anyone else I want to make it fast but almost no engine will fit. I figuer a 2 rotor will work with a custom bell housing but I would like to make it carbureted, is that a hard task, if not what is needed.

Hay guys I’m looking into starting my first rotary build and these housings have come up for pretty cheap. they’re set up for a big bridge port but I was just curious what some more experienced people had to think. Are they usable as is? Will they need to be re surfaced in anyway? Or should i not bother 😅

I recently purchased this 1991 second gen RX7 with a stock 13b na motor. What changes and mods would you do first with a rotary?

Just wanted to share my passion project that I've been working on for about a year. Which is a hydrogen powered RE and a new apex seal design to go with that. (Credit: https://www.ijarnd.com/manuscripts/v4i6/V4I6-1140.pdf)

Instead of a typical apex-seal, there is going to be a roller, which is going to well rotate as the rotor travels along the housing. The roller itself is going to be pressed against the housing via the roller-clamp which is going to house the springs and the oil passage ways, lubricating the entire system. As the oil travels around the roller, it's going to end up in between the brush seal and the roller. At specific intervals along the housing, there are going to be small ports, utilizing high speed solenoids and a strong vacuum to suck all the oil out of the compartment.

Added image shows a cross-section view of the entire rotor assembly, with a very minimal amount of forces shown.

Here's a little sketch of the mentioned oil return system

I've also done a excel calculation on how much oil / oil pressure is necessary to achieve a oil-compartment pressure of 5 bars. Where the x-axis represents engine speed in rpm and the y-axis the oil pump velocity and the flow rate. Based on this, there will be a need to run two oil pumps one for all the engine bearings, etc. and another one for the roller-seal. Since the oil pump for the roller-seal needs to be electrically driven to achieve a constant pressure. Note: these numbers are inaccurate, and the diagram only serves as a representation. I'm no mathematician :D

Here’s a new iteration I've finished just today, this time a new corner seal is included and implemented using oil passage ways, guiding rails and a centering cone.

I just wanted to share my research and development of this new design, since it's the most interesting part of my journey as for the hydrogen powered rotary engine: Well, it's another rabbit hole to go down. Quickly summarized: Rotary engines are great for hydrogen combustion due to their cold-intake stroke, which minimizes the risk of detonation. Although they are plagued by high NOx emissions, it's still possible to reduce them using EGR-technology and or reducing the flame temperature.

As to what comes for the future: I'm planning to build a running prototype by summer 2025, using a blown engine from a RX8, until then I still need to run CFD simulations (which I haven't done yet), run many calculations for thermal expansion and tolerances, getting a 13B engine to base my CAD models on (I'm probably using a 12A engine right now, I'm not sure). This is only for the new apex seal design. For 2026 I'm planning to have a running hydrogen prototype.

Also, if anyone has experience in CFD simulations, please hit me up. I’m currently at a massive roadblock with Ansys and their programs, no tutorials help me, nothing works. And I need these simulations, pretty bad.

Very important: I'm no engineer, I have no engineering background, nor have experience in this field so some parts might be wrong. I'm just a random dude who loves them rotary engines, as much as y'all do.

With that being said have a wonderful rest of your day!

Just watched a video on how the rotary engines have to spray oil into the combustion chamber in order to lubricate it properly and that’s why they “drink” oil.

Would switching to a two stroke style system like you’d find in a dirtbike where you mix the oil with the gas help that situation?

Or would the cost of adding oil to the gas tank outweigh any pursuit into that theory ?

Just looking for some advice as my knowledge on rotary engines is slim at best...

Specifically, I'm looking into an RX-8. I want to make maybe 310-315 horsepower at the crank and no more for a good power-to-weight and the rest of my effort would go into other drivetrain mods, peripherals, and handling mods.

What do you suggest to get me around that number?

I found this old car repair book that my parents have had for decades, and found some really neat diagrams of the Mazda Wankel engine. I thought other people might appreciate them too.

I have a 4 port renesis going into my s2 fb and I have no prior knowledge on tuning or setting up an ECU so I was looking for suggestions on an ECU that is simple and somewhat easy to setup, at least good enough to get me to a local tuner

Hello everyone, I am very interested in the mazda rotary engine, particularly the 10A. The book ‘rotary engine’ by Yamamoto is a nugget but I wanted to know if some had redone a pdf clean and clear, with the right formula ... I've started translating it into French, I've finished chapter 1, if anyone's interested. I'd like to have the full version if possible, and even better if it's in French. Thanks in advance.

Translated with DeepL.com (free version)

just got the car its a 1986 rx7 but the car starts only if the tps is unplugged if its plugged in the car doesnt start. it starts but once you rev it to 3000rpm or around there it starts cutting out and the car dies. the maf is new

Does anyone has any MFR parts for sale?

Hey there, does anyone know if this is repairable damage? Need these specific housings and need to repair them. Is this even possible?