Bigyellowcat, I'm curious what led you to choose the rotary engine for your boat application?

I think the prices are reasonable considering the time it takes to develop things like these engines and the small volume that is turned out, regardless of price. After all, we are all trying to earn the skrilla and the sad truth is that not everyone can afford to pay-to-play at the levels they want to. Suppose the 4-rotor kits were half the price, or even less; most rotary enthusiasts still wouldn't even come close to being able to afford the project as a whole, let alone a piece of the puzzle.

Also, not that I own one, but I'm pretty sure the 4-rotor "kits" are all 13b based and not 12a.

On a side note, with news that Mazda is ramping up manpower/R&D on the new 16x engine, the future is in the development of parts for that application, not 13b based platforms and especially not 12a based engines. Three and four rotor 16x based applications (for cars) should be a breeze to those that are already ahead of the game. Bigyellowcat, are you listening

 

there is technically no oil sump... there is just a port under the stationary gear where the oil drains to then the dry sump sucks it out from there.. that way i did not have to have any kind of oil pan which would have made the engine larger.

spark plug fouling at rest with the spark plugs on the bottom.. we put alot of thought into this engine to make it as small and good looking as we could and this was the best way to make it for our application, we did some testing with a normal rotary engine laying on its side and running it and shutting it off and pulling the plugs real quick and letting it sit with a towel in the hole or under the hole and some times they would get something on them some times they would not. but rarely did they both have something on them... with a two rotor engine this would probably be a bigger problem but with 12 rotors most are going to fire then the others that did not will be cleaned almost instantly. and in most of the boats this would go in the engines are leaned out a slight bit so there would not be any problem.

hopefully you will hear this in the next couple weeks... waiting on cermaic tip seals to show up.. to reassemble it.

this is based on the idea of how a 13b works but we planed on making every part but the rotor and we were going to use factory rotors (now we are building those also so we really could have started from scratch).. so the only thing you can put into a normal 13b would be the rotor every other part of the engine is designed around what we wanted not what would fit in a mazda.. we were going to make the stationary gears also but i found them cheep enough that we bought them and modified them to what we wanted. in the end the only thing that is mazda spec is the rotor, even the shape it follows is not mazda spec(sleve), the stationary gear we changed the bolt pattern, the oil hole sizes and location, the diameter, and how it seals the oil pressure, and hardness.. there is nothing else that is comparable to 13b.

yep you can come see my shop anytime just let me know in advance to make sure i will be around.

 

here is something that may help enthusiasts... we took one of my sleves and fixed a stock housing that was ruined. just machined out the factory sleve and pressed mine in..

 

Do you have a guestimate on the weight of that thing?

I'm sure someone would be froggy enough to shoe horn one of those in a car....

 

Oh hell, you're going to get spammed with emails now!

Pretty cool seeing a local doing all of this...

 

That is a really nice option to have...

 

Would you be interested in replacing sleeves for customers? If you could do it for less than a new set of housings you would be up to your eyeballs in rotor housings!

 

No doubt about it.

 

$100 per housing sounds reasonable.

 

Don't scare him off Eric, he doesn't know how cheap we are yet.

 

the raw piece of material costs me quite a bit more then that..

again this may not be cost effective for a stock housing, but if you already had your exhaust housing ported alot and did not want to buy a new one and do it again then this may be worth it.

how much is a new housing going to really cost someone?

 

If this dude can do housing inserts....OMG, hes F-ed in the A . everyone will be nut swing no doubt. This guy may jsut "re-invent the wheel"

 

A new set cost in the 1000-1200 range.

 

Aint that the truth!

 

the 1000 range would probably not be worth the amount of work on small scale doing them,, that would be 500 each, there may be 150 for the material for the sleve and 200-300 for tooling. then you have electric and time.. and we have not touched the factory part yet.. I will probably have in the 1000 range in each of my sleves with the amount of work we have in them and the coatings on them.

but if there was enough demand for it we could work on a faster cheeper way to do it.?

but for stock i would say its not going to be cost effective unless we made hundreds or thousands of them..

 

Well hell, screw the 4 rotors, 5 rotors and 12 rotors, becuase this is what is important! You've just done something that for some reason, no one else has done. The demand for re-sleeving housings is going to be huge. How huge? Try finding an OEM 12A or early 13B housing. If the volume demands, and it will, and you can get the price down to say $250 a housing, then you have a massive winner here. These resleeved housings are likely the most important development in the rotary world since the Renesis.

 

Major praises from me my friend keep it up

When you have the time I would very much appreciate your input in my replaceable sleeve thread,with regard to what your doing with those sleeveshttps://www.rx7club.com/rotary-car-performance-77/press-sleeve-replacement-rotor-housing-935110/
A lot of naysayers on that thread,i know it's possible i just don't have the money or equipment to do it and prove them wrong.it looks like you beat me to it and once again keep up the good work

 

Thts exactly what i was thinking. If he can get the price down....This dude would have more money flowing at him (than he already has) he wouldn't know what to do with it all.

 

From someone like me who is very limited in the fabrication department, I can't even grasp what goes into designing something like this, but I too can tell you that your hands would be full just from the die hard 12a guys like myself. A true contribution! I hope all the regular vendors such as racing beat etc sit up and take notice instead of listing part numbers in their catalogs with the words next to them..."no longer available".

 

guestimate...?? you dont know us very well.... 839.95 lbs... maybe take an ounce of sanding material away .. to polish it...

 

Bravo!

Did I read that right, 6,114 cubic inches?

 

+1 billion

I have 10 housings that are trashed and can use a resurface or a new sleeve.

 

awesome work doing a lot of helpful things for us rotary guys

 

There are housings that Mazda will never make again, like the 13A housings from the Luce R130, or the 10A housings from a Cosmo. This is a good alternative to hunting for decent housings for years.

 

That is the displacement of materials in the engine.. aluminum, tool steel, titanium, magnesium, unobtanium, ect. ... not engine stroke.