Mazda Brought Back The Rotary Engine!
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- Опубликовано: 16 фев 2023
- The Wankel Rotary Engine Is Back In Production Thanks To Mazda!
How Rotary Engines Work - • This 3D Printed Rotary...
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From Mazda:
"With the discontinuation of the RX-8, Mazda ended mass-production of the rotary engine in June 2012. Today, some 10 years later, the rotary engine is making a comeback. This new rotary engine has been adapted to meet the needs of our times and is now being used to generate power rather than as a drive unit.
While the 13B Renesis engine used on the RX-8 was a 654 cm3 two-rotor engine, the MX-30 e-Skyactiv R-EV uses an 830 cm3 single rotor format for the rotary engine generator. With a 120 mm generating radius (R) and 76 mm rotor width, its compact size enables coaxial placement and integration with the electric motor, decelerator and generator to achieve a unit with an overall width of less than 840 mm that fits on the same body frame as the MX-30 BEV. We also successfully reduced the weight of the engine by over 15 kg by using aluminium for the side housing section of the engine structure instead of the iron used on the Renesis engine.
The main contributor to increasing fuel economy and reducing emissions on the MX-30 e-Skyactiv R-EV rotary engine was the use of direct fuel injection. When fuel is injected into the ports on a conventional rotary engine, a lot of the air-fuel mixture ends up at the back of the combustion chamber, not fully combusting and eventually being expelled as unburned gas. This has a negative effect on both fuel economy and engine output.
The rotary engine on the MX-30 e-Skyactiv R-EV uses direct fuel injection, making it possible to distribute the air-fuel mixture to the main combustion area and achieve more efficient combustion. Additionally, direct fuel injection atomises the fuel at the time of injection making it possible to sufficiently vaporise fuel even at lower temperatures. This also helps prevent the injection of excess fuel.
The engine also adopts an exhaust gas recirculation (EGR) system to improve fuel efficiency. Adding an EGR system that operates mostly at low rpm and low loads improves fuel economy by preventing cooling loss caused by rotary engine combustion chambers having a greater surface area than those of a reciprocating engine.
Apex seals are attached to the tip of each rotor to ensure the combustion chambers are airtight. For the MX-30 e-Skyactiv R-EV, we increased the width of these seals to 2.5 mm to improve wear resistance. We also changed the plating on the trochoid surface inside the housing to reduce wear and frictional resistance. For the sides of the housing, we use aluminium for the surface of the side housing and have added high velocity oxygen fuel coating to add a ceramic coating which also reduces wear and frictional resistance."
Related Videos:
Why The Rotary Engine Died - • 4 Reasons Why The Rota...
Mazda's Hydrogen Rotary Engine - • Mazda Built A Hydrogen...
References:
MX-30 Press Kit - eu.mazda-press.com/forms/logi...
RX-8 Press Kit - newsroom.mazda.com/en/cars/11...
BMW i3 Press Kit - www.bmwusanews.com/newsreleas...
VVT Study - doi.org/10.1016/S0360-5442(02...
Rotary Engine Intake Timing Study - doi.org/10.2298/TSCI180504058Z
Mazda Patent - patents.google.com/patent/US2...
Hat Tips:
Mazda VVT Patent - carbuzz.com/news/mazdas-new-r...
MX-30 R-EV Background - www.greencarreports.com/news/...
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*Common Question!*
Gotta love Mazda’s resilience with keeping the rotary alive.
I appreciate how engineers can complicate simplicity
Will it last over 100k miles before needing rebuild?
I love how when you really break down the complexities of a system like this, even if the device is boring or lame, once you understand the system, it suddenly becomes fascinating. That being said, I can't wait to see what Rob Dahm does with these rotors and housings haha
Quick somebody tell Rob Dahm!
You've mastered the art of explaining complicated technical subjects in a way anyone can understand. I love every minute of your videos.
How...meh. Zero interest in hybrids or EVs. A shame, rotaries were pretty cool but it seems that they are truly dead. An excellent video as always.
Funny story: Many years ago I worked with a large team of engineers who were submitting analysis of car motors for the EPA. We wrote the study you mentioned 😁. Also your white board is concise and easier to read compared to the 10 or 12 we had in our office. Also, our paper found according to the current rotary engine schematics that Mazda provided at that time, we found so many issues with operation and inconsistencies with their EPA readings. I hope Mazda has found a better way this time. I'll remain skeptical for now
I have to say, this is EXACTLY what I've been saying the Wankel engine should be used for. A single-rotor range extender that can run at a more-or-less constant RPM takes the best advantage of all that the Wankel has to offer. Granted, I also believe Mazda should seriously consider throwing on a big-ass turbocharger because turbo lag doesn't matter on a range extender, but maybe in the future. Of course, I would love to see non-hybrid rotary car at some point, too, but I'll take my wins when I can. A range-extender is a great way to keep this fascinating technology alive, and I support Mazda 100%.
Why is anyone investing in ICE engines in 2023. Do they hate money? 😂
I had an 87 rx-7 and it's the least surprising thing in the world to read that a lot of the fuel went out the exhaust. You could stand behind it and see/smell it happening. It was my favorite car ever.
Fascinating how using the rotary as a hybrid actually improves the efficiency of the engine itself rather than just the efficiency of the overall system.
I love knowing that Mazda has not given up on the rotary. Mazda is a very special company, if you look at their history, people and passion in that company - they are so impressive.
What an awesome video. I posted a comment concerning the added vibration of this (angular deceleration must be transferred into some (small) linear acceleration) but then I un-paused and you answered my question. I love how you anticipate what your viewers are thinking so well.
Honestly, I really love this idea, I drive a Chevy volt, so I’m obviously biased, but most trips are short electric trips. And so it works perfectly fine. You can make 4 plug-in hybrids with the same amount of batteries as 1 full EV with decent range. And the overall salts in more electrical miles driven..
This is the second of your videos i've watched, and I'm absolutely blown away!! Subscribed, think i'm going to enjoy binge watching your previous videos!
I been wondering for years, close to decades now, why rotarys aren't used in hybrids. Seems like a great pairing to me.
Absolutely love Mazda's dedication to keeping the rotary alive and even improving it out in these times. I can't help but feel another rotary beast is on the cards, but we can only be hopeful
The amount of joy I got from this video is substantial. I can't wait to see what Japan really brings to the EV market.