After much experimentation and some encouraging results , I filed a provisional Patent for the rotary engine to help with fuel economy and emissions .
Please come onto my Facebook page and like the page to lend your support .
Cheers
Brett

https://www.facebook.com/rotarypatent/

 

Very interested to see where this goes....

 

Cheers . I wont be holding my breath over it but now that I've come this far I thought I may as well throw it out there and see what comes back .

 

Interesting indeed, how long have you been working on this for?

 

It started about a year ago when I fitted a small bridgeport to my turbo Renesis. I wanted to see what it did for fuel economy and got some promising results on that (but poor performance with it ) . I then bought a second rx8 and built an N/A engine with a similar design to the patent . Following on from that I had another turbo engine built which incorporated the patent design exactly as pictured . That is what I'm currently testing. So 2x cars and 3x engines ...so far !

Initial discussion started here :
https://www.rx8club.com/series-i-tec...enesis-264156/

 

are you tuning it with a cobb or is this just a stock engine you gained 10% fuel economy from?

yes, from looking at your patent papers it looks like a very small bridgeport type of addition, which can improve power but any economy gains likely came from a tuned ECU, which is possible with a catless car and a way to lean out fuel trims because there is no catalytic converter that needs to be saved from enrichment.

in stock form, i'd assume this would add to emissions instead of take them away as well. problem is, that's still a low velocity area and you likely are pulling more overlap and intake duration than pushing inert gases into the intake via the addition. in other words, more pulling than pushing is being done.


one thing i have always been more curious about than anything else is how the addition of reed valves to the engine might affect power output. turning a valveless engine into more similar version of a piston engine but with less RPM restrictions, mostly based on the intake and reed valve sizes. that's a simple concept used in 2 stroke engines and air compressors to eliminate moving valves, so it's nothing new but i always wondered why mazda never incorporated it. i assume because you trade some top end for torque and mazda has always been proud of the high revving rotary.

 

I do have tuning software (mazdaedit) but the gains aren't from tuning . The RX8 ecu maintains afrs at 14.7 under light loads ..... there is no cat protection mode that I have overridden. As far as power goes ... without the ability to block flow there is a definate LOSS of power at full throttle .
Remember this is a Renesis engine with ZERO overlap . The overlap I have created is before top dead centre ..... not after as can be achieved with a bridgeport on a PP exhaust engine.
At light loads the exhaust gas at top dead centre has a slight positive pressure and the adjacent chamber has a fairly strong negative pressure . So there is only one way the gas can go and that is into the chamber , increasing egr .

 

I have Changed the Slideshow at the top of the Facebook page to try make it easier to understand . Click on each page individually.

 

So it uses an actuator to control the EGR or not?

what sort of dilution are you seeing at cruise? Did you push unril missfire or just took a guess as orifice sizing and it worked?

 

Great questions ... thanks !

Yes , there is a valve that controls EGR. I have piggy backed onto the stock APV valve to achieve this but the patent is written to cover any other possible way to achieve a controlled outcome . At cruise I would estimate egr jumps from around 10% for the stock engine to around 15% ...but that is a complete guess based on the volume available to drag EGR from as the port opens.
I really wanted to push the amount until it misfired but due to constraints within the stock engine design I was unable to achieve this. I think the benefits could well be considerably more than the 10% fuel saving I have achieved to date if I was able to do that.

 

Bump

 

even if it works, unfortunately the 13B-MSP is mazda greatest abortion in the last 40 years. mostly because they just wear out faster than any other rotary aside from the antique carbon seal engines, which is a major design flaw.

 

Not the most successful engine ever I would agree .However, If there ever is another rotary engine car ever built , it has to be a side port.

 

Their newest patent for the generator shows a peripheral intake port with a side exhaust port.

 

Are we counting that as a car engine ?

 

I would generally say no as it's going to be the electrical generator for an electric motor but it still needs to meet emissions standards. I have no idea what rpm they intend to run it at, or if it's in an rpm range.

 

Lot easier to get efficiency from an engine at constant speed - which is what it will be doing I assume.
What did you make of my patent RG ...do you see potential there ?

 

I think the idea certainly holds merit. It's awesome that you decided to think out of the box. It's a creative solution. I'm not sure that the patent will be granted but it would be really cool if it was. It would be interesting to get the car on an emissions dyno to see what the results are.

 

Thanks for that . I have a bit of time to decide on if I take it further but the next step is very costly so I need to decide if it's a waste of money or not.

 

Bump

 

Im not trying to be the debbie downer of the group but I thought mazda already tried this in efforts to continue the rx8 line and they still failed epa standards? My uncle is a patent examiner for the uspto ill see if he can dig anything up, but im pretty sure it did work as stated its just unfortunately not enough. Im more interested in the whole fcr? Dpf style exhaust in the diesels...they flow alot of air naturally so i assume something of the sort could be adapted to rx7s to possibly make partial or zero emmissions

 

I did get a patent search done before filing this and it showed up nothing like that. Very interested to hear if they did try it out ............. where did you see this sloppy79sa ?

What's fcr ?

 

Yeah! Uncle came up with nothing, this really excites me as far as potential rotary legacy expansion.

It was GMs fancy acronym for emissions reduction it was habit to say haha. But all I was talking about an alternative possibility to emissions reduction, egr is so much more efficient and effective

 

Mazda u.s. patent 24
Did you see this?

 

Yes .... gives us some hope they are still planning a rotary for the future !