Need help with difference between 2 and 4 rotor?

[Rotarypower12]

besides housing and more rotors and power what's different? does it make it a bigger liter? And do you need anything else special for it?

Thanks

[cocoy0212]

Yes, liter gets bigger. And ya also oil/fuel ratio is different because of the bigger engine.

[stallion]

1.3 and 2.6.. the liters are doulbed..