swimmer4uus

What do ya'll think about this doosey? Now whether or not it would hit is another issue, but this is the basic design. I think it looks ugly, but was wondering if it would work?

swimmer4uus

Finish with all the runners.

hIGGI

iTrader: (7)

http://www.revil.net/motor/z_viz.html

http://www.revil.net

Steel

er uh... arent 20b rotors NOT 120 out of phase? I thought two of them were in the same phase and the third one was 180 out from that?

GtoRx7

iTrader: (5)

No, they are exactly 120 degrees from each other. The two rotor is 180 degrees.

GtoRx7

iTrader: (5)

Here is a 3D model I made, took me like 17 hours straight of sweat and tears.

Steel

shadamn. i could have SWORN that the two rotors that are closer to each other were in teh same phase and the third one was 180 out. Where could i have gotten this idea? I thought that's what explained the 20b's funny sounding exhaust note.

GtoRx7

iTrader: (5)

Not too sure where you got it, but its not easy to see unless you have one in your hand. The sound hits 3 times per rev, unlike a 2-rotor hitting 2 times, hence the badass sound. If two were on the same phase, with one 180 out, two would have to fire at the same time, since a rotary is not like a 4 cycle piston engine with two TDC, one intake, one exhaust. It would be way out of balance, with uneven power, and sound like a messed up two rotor. If all that makes any sense.

CMonakar

GTORx7 is correct. Study the diagram and you will understand.

swimmer4uus

Just for search purposes I used Solidworks 2004 to model.

Steel

Well i can imagine the 120 phase no problem. this is how i first thought of these motors until i read, or someone told me otherwise. buuut. i guess they were wrong.
my whole world has come crashing down.

Anyone know what the firing order for the 26B motor is? maybe i was thinking of that one.

GtoRx7

iTrader: (5)

1,2,3,4 rotor fire. With 90 degree phase difference between each one. That is not counting the aftermarket 4-rotors, which some company's offer cheaper ones that fire two rotors at once, aka 1+3 and 2+4 at 180 degree phase. But the 90 degree 4-rotor is the one that sounds like a F1 car, at 5,000 rpms its hitting as often as a 2-rotor at 10,000rpms hence the crazy high sound.

swimmer4uus

I've also seen somewhere about one firing 1-3-2-4

B6T

iTrader: (2)

Looks good!

I just finished a similar project for a rendering class. I used Inventor and 3ds Max:

Auto Illusions

I posted a 3-d model of my intake manifold for all to see if interested in my thread.

Check it out and subscibe if you are not already as i am getting ready to start posting some really cool updates again.

https://www.rx7club.com/showthread.p...&page=46&pp=15

Eson

Made som models too, functional geometry:
http://hem.bredband.net/b235625/rotary1.jpg
http://hem.bredband.net/b235625/rotary2.jpg

shm21284

I do not see the point of having 2 runners go into one port, one runner longer than the other. Do you have evidence why this would help?