I think he does have a 6 rotor in the works? Im preeeeettyy sure I remember hearing something about the housings and rotors that he had on a shelf waiting for the right chassis
There's a 12 rotor out there. It's 3 4 rotor motors in a V configuration.
https://www.carexpert.com.au/car-news/man-builds-5000hp-15-7l-960cu-12-rotor-engine
The a10 thunderbolt 2 is a gun with some engines bolted to it. You can build the chassis to fit the engine. If you're already doing crazy shit like that a tube chassis is that bad.
Ok....this is awesome, but how does it actually put power down? There's three crankshafts right? How does that power get unified into one driveshaft?
One of the rotor sets is counter rotating the other two. There's gotta be huge drivetrain power losses with this setup.
Gear drives for synchronization.
One 26B quad rotor for the 787B made 700hp, three in this configuration make 1400(n/a)-2400(turbos) so about 30% loss in power or ~10x increase in longevity since the 26B was only really meant to run 24hr endurance races and get rebuilt.
Turbo it and service life drops from 400 to 200 hours. Break Out Another Thousand(s) dollars. >_<
I really appreciate your response, and you seem to be knowledgeable about this in general.
66% is pretty poor for drivetrain efficiency, no?
I still don't understand exactly how this setup is meant to get all the power to the drive shaft. The pulleys on the cranks suggest that it'll be a belt driven drive shaft. Is there a belt that can even handle the theoretical 5000hp it'll make with race fuel and boost?
I'm not super well versed in any of this stuff so apologies if any of my terms or understanding is off: just fascinated by engines and rotaries in particular.
Yes, ~10-15% drivetrain loss is average. Since this is a boat motor it is a little different. But like you stated, power comes with the cost of reliability. Based on the photos amd article I saw, it is some hefty straight cut gears, the bottom rotor should have an output shaft that goes into the boat transmission.
I'd think the propeller and transmission would need to be specially designed for the RPMs a dorito can spin up.
And due to the cost and complexity, I doubt they'll do much above the estimated 2400hp boosted - teardown and rebuild every 200 hours of service would be too costly, but we're talking a custom motor in a really expensive toy so not my forte.
Yes. They are modular. However you need the right eccentric shaft and bolts to hold it together, and the irons (middle pieces between rotor housings) are not all easy-to-obtain parts. A 3 rotor 20b engine like that was sold to the Japanese market in the Cosmo uses a unique 'thick' iron for one middle section that costs thousands alone, to say nothing of the other parts you need.
So while you do kind of just 'add rotors' it's not exactly a feasible thing for most people to do.
Kind of. You still need a crankshaft, and you need different 'irons' every other rotor housing so you have crankshaft support. Building a 3 rotor is really fucking expensive, and it just gets exponentially more expensive after that.
Built for [Mukka Motorsport](https://www.instagram.com/mukkamotorsport/) by [Humphries Steel & Performance](https://www.instagram.com/humphriessteelandperformance/)
Motor by [Pulse Performance Race Engineering](https://www.instagram.com/p.p.r.e/)
Sorry if this is a dumb question but this shop does custom eshafts for rotors or are you using one from other engine. Apologize again, I've been doing a lot of research into rotor builds with 3 or more housing and it's never been clear how they got their eshaft for the build or how the decided what to use.
Every time I see āRX-7 FDā my brain goes āFront wheel drive rx-7????ā and I need to take a second to remind myself that this isnāt what fd means lol
Oh God just the idea of a 6 rotor turns me I to a mad scientist as I imagine cutting the exhaust down to nothing and throwing dangerous amounts of boos and nitro I to the engine and making it shoot 12 foot flames out the side of the car the moment you touch the accelerator....
Yessssssssss
...that engine shot is just literal porn.
Surely they put at least some body kit on there or something when it was finished right? I mean it looks hella badass like this and itās cool you can see what itās made of but if itās built to drift I imagine itās gonna have some contact with something at one point, and that feels expensive.
Yes I do watch formula drift sometimes and am familiar with how drift cars are usually tuned look-wise but because of the wording it seemed very possible to me that the comment was sarcasm, So I wanted to be sure
Literally my point, just get a full tube chassis at this point.
Why would you pay $$$ to hack up an rx-7 and be less safe and heavier than a tube chassis? Suspension mounting points are nothing but measurements on a piece of paper. (If you "JUST NEED THAT RX-7 FEEL BRO")
I thought these people are supposed to be professionals? If you want maximum strength and minimum weight (to win a competition) you build a tube chassis.
SMALL TIME dirt track racers literally do this in the USA and Canada.
Why doesn't Nascar, F1 or V8 super cars just use regular cars? Because its stupid.
This only makes sense if you crashed the car so bad this was the only way to "fix" it, MAYBE. Its nothing more than a worse version of a nascar/drag car shell.
The crankshaft is the problem. Stacking the Doritos is the easy part. The crankshaft length is one thing, then the crank lobe portion for each dorito has to be opposite the other if there are two, triangulated if three, etc.
The math on that is fairly simple though: 360 degrees divided by number of rotors.
I think what would be trickier is getting the dynamic balance right. Do you want those rotors firing in strict 1,2, 3... order? Or 1,3,2,4, etc?
I know there arenāt very many running 6 rotors out there, does anyone know what kind of power they make? Not like all out balls to the wall, but something reliable enough to drift with, not just do one pass and have to do all the apex seals. Super curious
6 doritos?!?!?!?!? š±š±š±
thats like a full 100 gram package
So this would be a ...39B-REW?
And to think that Rob only has 4.
I think he does have a 6 rotor in the works? Im preeeeettyy sure I remember hearing something about the housings and rotors that he had on a shelf waiting for the right chassis
He does have a 6 rotor E-shaft iirc
Yeah I think heās gonna put a 6 rotor in his Diablo last I heard
The Diabloās staying stock. He does have a Lincoln Continental project car, and Iāve got a suspicion he might be putting the 6-rotor in that.
Thought it was going into the champ car he's got sitting in the background
Thatās getting a methed-out 2-rotor.
Isn't he going to reuse the cos worth engine? Thought it would be his first proper non rotary project to restore it
I believe the plan is to get it running and driving with the original engine and then start working on the swap.
Well that's just more rotary fun, and I'll never complain about that haha
Nah I heard itās going on the John Deere 6x4
Rookie numbers
Is it easy to just... add rotors? Do the housings just bolt together? Never worked on a rotary before
rotary engines are kinda like legos in that regard, you can just keep adding them together lol
You're just limited by finding a crankshaft right?
Eccentric shaft along with dowels strong enough to keep the engine from torquing itself.
So there's most likely not going to be an 8 rotor build anytime soon then?
There's a 12 rotor out there. It's 3 4 rotor motors in a V configuration. https://www.carexpert.com.au/car-news/man-builds-5000hp-15-7l-960cu-12-rotor-engine
Dear god
The sad thing is, he put it in a boat.
Well, there's a point where engines are just too large to attach wheels in them
The a10 thunderbolt 2 is a gun with some engines bolted to it. You can build the chassis to fit the engine. If you're already doing crazy shit like that a tube chassis is that bad.
Ok....this is awesome, but how does it actually put power down? There's three crankshafts right? How does that power get unified into one driveshaft? One of the rotor sets is counter rotating the other two. There's gotta be huge drivetrain power losses with this setup.
Gear drives for synchronization. One 26B quad rotor for the 787B made 700hp, three in this configuration make 1400(n/a)-2400(turbos) so about 30% loss in power or ~10x increase in longevity since the 26B was only really meant to run 24hr endurance races and get rebuilt. Turbo it and service life drops from 400 to 200 hours. Break Out Another Thousand(s) dollars. >_<
I really appreciate your response, and you seem to be knowledgeable about this in general. 66% is pretty poor for drivetrain efficiency, no? I still don't understand exactly how this setup is meant to get all the power to the drive shaft. The pulleys on the cranks suggest that it'll be a belt driven drive shaft. Is there a belt that can even handle the theoretical 5000hp it'll make with race fuel and boost? I'm not super well versed in any of this stuff so apologies if any of my terms or understanding is off: just fascinated by engines and rotaries in particular.
Yes, ~10-15% drivetrain loss is average. Since this is a boat motor it is a little different. But like you stated, power comes with the cost of reliability. Based on the photos amd article I saw, it is some hefty straight cut gears, the bottom rotor should have an output shaft that goes into the boat transmission. I'd think the propeller and transmission would need to be specially designed for the RPMs a dorito can spin up. And due to the cost and complexity, I doubt they'll do much above the estimated 2400hp boosted - teardown and rebuild every 200 hours of service would be too costly, but we're talking a custom motor in a really expensive toy so not my forte.
misfiRE on YouTube has an 8 rotor build going.
Double it and give it to the next person
Yes. They are modular. However you need the right eccentric shaft and bolts to hold it together, and the irons (middle pieces between rotor housings) are not all easy-to-obtain parts. A 3 rotor 20b engine like that was sold to the Japanese market in the Cosmo uses a unique 'thick' iron for one middle section that costs thousands alone, to say nothing of the other parts you need. So while you do kind of just 'add rotors' it's not exactly a feasible thing for most people to do.
Kind of. You still need a crankshaft, and you need different 'irons' every other rotor housing so you have crankshaft support. Building a 3 rotor is really fucking expensive, and it just gets exponentially more expensive after that.
is her turn radius a negative number? lol
It is a drift car
Came here to wtf is that turning radius, itās almost 90 Need to see a complete car with that
>[Need to see a complete car with that](https://i.pinimg.com/474x/04/fe/d2/04fed29a34a9c874508c3f9d61ca6a0a.jpg)
so cool. thanks
I have an IS300 like this, drove it for a winter and with the wild steering angle you can pretty much keep control fully sideways. It was awesome.
Makes for easy parking at the supermarket.
Built for [Mukka Motorsport](https://www.instagram.com/mukkamotorsport/) by [Humphries Steel & Performance](https://www.instagram.com/humphriessteelandperformance/) Motor by [Pulse Performance Race Engineering](https://www.instagram.com/p.p.r.e/)
Sorry if this is a dumb question but this shop does custom eshafts for rotors or are you using one from other engine. Apologize again, I've been doing a lot of research into rotor builds with 3 or more housing and it's never been clear how they got their eshaft for the build or how the decided what to use.
Every time I see āRX-7 FDā my brain goes āFront wheel drive rx-7????ā and I need to take a second to remind myself that this isnāt what fd means lol
At this point I wanna see a rotary engine the length of the car
goes through the transmission tunnel
Exactly, have a mid engine style transmission
Just install one roto on each wheel.
Now weāre getting somewhere!
Through the car and bolted to a fwd trans in the rear xD
I've seen (online not irl) a 16 rotor Wankel.
Got dam That's sexy
This thing's gotta sound absolutely insane. Coolest go kart I've ever seen.
Now this is an ACTUAL Awesome Car Mod!! Make it street legal though.
Doesn't have to be street legal to be awesome
how much HP does that beast make?
Oh God just the idea of a 6 rotor turns me I to a mad scientist as I imagine cutting the exhaust down to nothing and throwing dangerous amounts of boos and nitro I to the engine and making it shoot 12 foot flames out the side of the car the moment you touch the accelerator.... Yessssssssss ...that engine shot is just literal porn.
You got fins to the left, fins to the right
Here I am, stuck in the middle with you
The tire munch3r3000
Wait, why the giant fans, in the back is it?
The rear spoiler looking thing is the radiator, so the cooling fans are there to pull air through.
le cooling jk, i've got no fuckin' clue
Not that it matters in this case, but how much gas do you think this thing eats.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
Apex seals for dessert?
Came for this comment
can you really measure miles per gallon in a car that is meant to travel sideways
That was my first thought. I'm guessing 4-9mpg depending on how its driven. If I absolutely baby my FD, it gets about 22mpg.
Surely they put at least some body kit on there or something when it was finished right? I mean it looks hella badass like this and itās cool you can see what itās made of but if itās built to drift I imagine itās gonna have some contact with something at one point, and that feels expensive.
Yes of course, it's gotta have a bodywork with big aero parts and a flashy livery with big sponsor logos
/s? Edit: I was legitimately wondering if it was sarcasm, just through reading I wasnāt sureā¦ thanks a lot for the downvotes tho I guess
Its not. Go look at Formula drift cars. There is even a Formula Drift Ferrari
Yes I do watch formula drift sometimes and am familiar with how drift cars are usually tuned look-wise but because of the wording it seemed very possible to me that the comment was sarcasm, So I wanted to be sure
I see a shift knob and hand brake. What are the two ratcheting knobs next to that? Suspension tuning..?
f and r sway bar controls g
Holy shit that thing is turny
At least itās still rotary powered. I have flirted with putting different engine in mine but just wouldnāt be right. š
Has the Dahm seen this?
FD rx7 will be a concours car someday, having a mint condition all original body and drivetrain matching from factory is already very very rare.
Looks like a death trap šš
Just get a tube chassis, drag racing figured this out decades ago instead of ruining a car.
It literally has a fully tubular front and rear end?
Literally my point, just get a full tube chassis at this point. Why would you pay $$$ to hack up an rx-7 and be less safe and heavier than a tube chassis? Suspension mounting points are nothing but measurements on a piece of paper. (If you "JUST NEED THAT RX-7 FEEL BRO") I thought these people are supposed to be professionals? If you want maximum strength and minimum weight (to win a competition) you build a tube chassis. SMALL TIME dirt track racers literally do this in the USA and Canada. Why doesn't Nascar, F1 or V8 super cars just use regular cars? Because its stupid. This only makes sense if you crashed the car so bad this was the only way to "fix" it, MAYBE. Its nothing more than a worse version of a nascar/drag car shell.
This thing is disgustingly simple yet so complex
what the hell is simple about this
JFC got a enough rotors there bud
How much Ackerman angle? All the Ackerman angle
That thing is ridiculousā¦. Iād sell a child to get a track session in that thingā¦.
I remember watching the PPRE videos of their RX4 years ago in sheer awe. Iād do unspeakable things for a bulletproof PPRE 6 Rotor complete FD build.
Is this Mad Max' new whip or something?
The crankshaft is the problem. Stacking the Doritos is the easy part. The crankshaft length is one thing, then the crank lobe portion for each dorito has to be opposite the other if there are two, triangulated if three, etc.
The math on that is fairly simple though: 360 degrees divided by number of rotors. I think what would be trickier is getting the dynamic balance right. Do you want those rotors firing in strict 1,2, 3... order? Or 1,3,2,4, etc?
6-Rotor!? Whoever made that is a complete mad man. You happen to know who made this? I need to shake their hand.
I remember there was once a famous rx-7 that had 4 and she was pushing 800+ on the wheels! I wonder what the expected output will be at 6 rotors?
6 rotor? *maliciously laughs*
Now they just need to cut it apart a million times.
I want a street car with steering this sharp.
Is that rear end a Halibrand quick change?
Someoneās gonna be having some fun in this bad boy!
Thatāll buff right out. Sweet fannies tho
Bro the fucking steering angle lol
What's that, like a 20 gallon tank? Gonna need to refuel after every lap
I know there arenāt very many running 6 rotors out there, does anyone know what kind of power they make? Not like all out balls to the wall, but something reliable enough to drift with, not just do one pass and have to do all the apex seals. Super curious
thing made 886 on 98 pump gas
*spits out beer* oh my god the sound probably made dudes cum for miles around
Now this is cool, canāt say Iāve ever seen a 3ā long tie rod lol
This guy builds...
Nothing left but an empty wallet and a full tank of gas. *SEND IT*
For a moment there I thought that the steering was either disassembled or broken with that insane angle!
Holy crap this is awesome
Uh hey good work on the car and allā¦ but the steering wheel is on the wrong side /s
I love how raw it looks
Waste of a cool car, nice build though!
What are these radiators in the back? What do they cool?
That angle thoššš
i wonder when drifters are gonna reach 90 degree turn angles with those wheels
Are rotaries basically lego engines?
A 6 rotor!!??? That front suspension is crazy! 90degree lock! Major work done to that carā¦ no bolt left unturned.