LinkBack URL
About LinkBacks
Kiwi made N/A PP'd 6 rotor in the making.
"PPRE6b" Six rotor Tubbed Rx-4 | Facebook
 |  | |||
 |
|  |
Kiwi made N/A PP'd 6 rotor in the making.
"PPRE6b" Six rotor Tubbed Rx-4 | Facebook
Last edited by NVMY R; 12th January 2012 at 01:55 PM.
Originally Posted by domn8r
Sweet baby fuel drinking Jesus. Can't wait to hear it.
Cant imagine what that will sound like but bloody hell that will be sweet!!
Don't listen to what I say, I make shit up as I go.
Imagine the power. Madness.
Like NZ Metal? Check out:
Evil In EdenAftermath
awesome, need a Tri turbo setup now.
that is insane , cant wait for a video of the start up
Im thinking a quad turbo, 3 smaller ones leading into a super thumper.... NOM
Only in NZ...
why not a hex turbo setup? or a freight train supercharger lol
Life's too boring without cars and tobbaco.
IF you can not tell the differences, you are the lucky one.
company called Hurley Rotary in England did this a few years ago
never released a kit for it though, because no matter how strong they made the e-shaft, the engine just kept failing catastrophically. I dont even think they even managed to get a decent dyno run out of it, the shafts would either snap because of the stress or the front rotors would get so far ahead of where they were supposed to be that the front rotors apex seals blew out
not saying that this wont succeed though, its just unlikely.
Last edited by J15guy; 12th January 2012 at 07:34 PM.
Is it really any different than Mad mike thrashing the absolute tits off a 4 rotor, than a 6 rotor being tuned semi-safe?
That is insane!
Series 7 RX7 http://www.youtube.com/lowintegra
People said the boat wouldant succeed as well, yet is the most reliable engine in the class.
i dont get pins and needles....i get machetts and knives
Why are multiple rotors difficult to build?
How do you mean?
i dont get pins and needles....i get machetts and knives
Actually I think it was answered in a post above as I reread. So it's ultimately a timing thing? IE getting all the rotors perfectly in sync?
5 and 6 rotor engines are hard to build because of several reasons, but the main reason is the e-shaft length itself
The e-shaft length, because of the length of the shaft itself and the power that each rotor produces there is a very strong tendency for the shaft to twist. This causes the front rotors to run ahead of where they are supposed to be; true, this could be accounted through changing the ignition timing on the forward rotors, but the deflection changes with rpm and load, so you can only 'predict' how far ahead the forward rotors are, this would mean that you would have to be VERY conservative on the timing, which leads to far less power. Top fuel dragsters have a similar problem, in that you can get up to 20 degrees of twist in the crank at full power, they compensate by having the crank throws actually offset by a calculated amount to compensate for the twist at a VERY specific RPM.
Of course, if the car is a purpose built race car (like the mentioned Top Fuel dragsters), which would be in a certain rpm band and under load almost all the time, then you could tune it to run good there, but it would sound and run like ass everywhere else, and the conservative ignition timing at low RPM would probably eat apex seals (and exhaust manifold, turbo, etc) very quick because of the massively increased EGT's.
Of course, if you REALLY wanted to get fancy, then you could place an optical sensor at the intake port of each rotor housing to detect the position of the rotor, and run an ECU for each rotor, using the optical sensor in place of a trigger wheel. But even with this you still run the risk of the e-shaft itself failing due to stress/too much twist.
Maybe switch off two or three rotors at idle, like some V8 road cars do? Or maybe only switch them on when conditions are right?
Alternatively, if you had sufficient length split them up, put a rotation sensor on the crank between each pair of rotors, run them as three separate engines with a common shaft?
I don't know much about rotaries, so this is mostly brainstorming!
The internet has so far disproved the theory that a million monkeys sitting at a million typewriters would eventually produce the works of Shakespeare.
Well, what they could do is what the last of the straight-8 car engines did, take the power off at the middle of the crank, effectively making 2 straight-4's placed back to back. The equivalent here would be 2 20b's placed back to back and in the middle a gears (or maybe a chain) to place the output shaft along side the engine (if this makes any sense to you, I cant really describe it)
Of course, this is very messy, and makes the engine even longer....
and it wouldn't be a true 6 rotor engine, it would be 2 3 rotor engines connected to a common gear (or chain) box
wow amazing so many experts on this.
Spent all day making mounts and fitting the gearbox to it today to check floor clearance.
i dont get pins and needles....i get machetts and knives
I'm intrigued, is this thing going to be turbo? I vote keep it NA for max ejaculation inducing noise.
racerdad1, I take it you work at PPRE or similiar?
92 FD3S 13b Bridgeport Turbo (Just over 250kw on run in)
95 AE111 4A-GE
In need of EK9 goodness
The quad rotor took a very long time for someone to problem solve similar issues. I wouldn't of thought that using stock rotor housings and rotors with a custom eccentric shaft would work if J15guy is right about that UK example.
But Kiwis are first-class engineers doing backyard projects.
It's staying NA and will be peripheral ported.
yup i do work for PPRE and the engine will be PP. and gudgen i dont know what you mean? Warren designed the cranks used in both mad mikes rx7 and the quad rotor for the boat and never had any problems? the boats engine has been on 6000 rpm 22 psi boost when the jet unit gave way, and stoped the engine dead. that was half way threw last season and its still going now. And ive never heard of after market housing or rotors?
i dont get pins and needles....i get machetts and knives
I was just going off what j15guy said. I was referring to the 6 rotor too. The 4 rotor is relatively new but has proven itself to be reliable and packs a lot of punch.
Posting Permissions
Reply With Quote
