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PPREs new RX4 project ;)

Yea just seen that on Facebook, pretty crazy... lol.. Will have to wait and see how she performs :)...

I was waiting for this thread :)

Running out of fingers to count

2 rotors are sick, 3 rotors are really sick. 4 rotors are like god. a 6 rotor, thats like god's god right there!

I thought this was a joke till I saw who was building it.

Curious why they bypassed a 5 rotor?

:dunno:

I guess 72* phased rotors just wouldn't sound cool enough? :lol: It would certainly cause some extra work in the engine management department. At least with 6-rotors you could phase 1-4, 2-5, 3-6 together, and with no-split timing it would be somewhat simpler/mainstream as far as ECU's.

I think they'll have three 180° pairs instead.

Think of who's building the shaft (Jeff Bruce?). Think of the way 4 rotor shafts with a 90° firing order are made = two 180° pairs with a 90° offset in the middle and two 45° offset counterweights at the ends only. So it's logical that this 6 rotor will have three 180° pairs. 60° firing order.

It's easy once you break it down for simplicity:

2 rotor = 180°

3 rotor = 120°

4 rotor = 90°

6 rotor = 60°

Rotor pairs of a 6 rotor (as I imagine they would be if only using two counterweights):

1 0°
2 180°

3 60°
4 240°

5 120°
6 300°

^notice each rotor pair is phased 180° apart from each other, then each pair is 120° off from the other pairs.

Leading firing order:

1 0°
3 60°
5 120°
2 180°
4 240°
6 300°

One ignition event every 60°. However you can cheat and only go every 120° by using three FC leading coils triggered like any wasted spark arrangement. This makes it more compatible with most ECUs. Rotors 1 and 2 will fire together. 3 and 4 together. 5 and 6 etc.

It'll run a lot like a 20B, but instead of having three single leading coils and three leading spark plugs firing at 120° intervals, you keep the 120° and swap the coils for dual output coils. That's how I'd do it. Pretty simple.

But the 5 rotor still intrigues me. I'd actually subscribe to a thead where someone's building a 5 rotor and it isn't a hoax. :)

With a proper ECU (e.g. Pectel SQ-6) 12 coils and 12 injectors can be run fully sequentially without having to be terribly clever at all. Considering the scope of this project, I could even say that it's inexpensive with a straight face.

Regardless, I'm interested to see how it comes out.

i saw it and was surprised that it wasn't up here. hope they start a thread should be cool i think they said it would have 8-1000hp na pp off-course:nod:
but i would really like to hear a 5 rotor, i mean inline 5 race bike engines (rc149) and so did the vr6.

thanks oliver

bloody kiwis

mad bunch they are:icon_tup:

Quote:

Originally Posted by Trots*88TII-AE* (Post 10950453)

Didn't think about it like that.

how do they get away with cooling it? Seems like it would be tough.

i wanna see the exhaust manifold for this and the length of the rods to hold this together...

And now its up and running.

i'd like to see the e-shaft and what they did to offset the deflection of such a long shaft.

if it makes even close to 1000hp reliably i will be surprised, due to the length of the shaft. shorter engines actually can make more reliable power.

call me Mr negative, my GF does everyday. :)

say even every rotor has a support bearing, with length comes twist and shear. take a steel rod that's 1" long and try to twist it and you can't, take that same rod 20' long and twist even with moderate force and you can easily.

that exhaust is sick... should be able to bake some potatoes under that hood.:icon_tup:

wonder how much the long block weighs?

This is insane! And the exhaust manifold is definitely a work of art.

Any dyno results, even its on the flywheel? Not only I, want to know what that beast does. I think between 700 and 800bhp

Somehow I don't think shaft twist is going to be an issue. They may want to externally brace the keg though.

How does one go about figuring out how heavy to make counterweights, and how to place them?