RX8Club.com - 4 rotor vs dual engine

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Quote:

Originally Posted by pcimino

That's assuming a geared or chained linkage. A fluid torque converter would probably allow the motors to get in and out of synch. The concern here might be harmonic vibrations. Dunno.

Rotation, in and out of phase, allowed by a torque converter is a good point.

It would never keep it in it's sweet spot.

It would be best to choose a static alignment between the two banks of rotors.

and lock it in with a direct drive...

Hmm, might have to put a couple of my 12a's together on a bench and investigate.

Did I mention, that my wife and neighbors, love me to death... ;)

Quote:

Originally Posted by scarroll

Hmm, might have to put a couple of my 12a's together on a bench and investigate.

That would be cool.

Quote:

Originally Posted by scarroll

Did I mention, that my wife and neighbors, love me to death... ;)

I have to start rebuilding engines. Then I too can be popular on my street! ;)

These guys did it on a dirt-track car with 2 13b's.

http://members.tripod.com/~grannys/4rotor.html

BTW the Tiburo was not Methanol cooled, it used methanol as it's fuel. That's why it won the emission test also on that USCC. And it ran 10's in the 1/4 miles. Did any mention that it was an Auto?

Quote:

Originally Posted by pcimino

I'm not even sure what you're trying to say. But you think phasing the rotors would be a problem?

Remember that if the Rotors are 180 degrees apart, they're also 60, 120, 240 and 300 degrees apart. With apexes 120 degrees apart on a rotor, you could phase 4 rotors at R1:0, R2:30, R3:60, R4:90, then at 120 you have the apex for the first rotor again. Should be able to make this very smooth.

That's assuming a geared or chained linkage. A fluid torque converter would probably allow the motors to get in and out of synch. The concern here might be harmonic vibrations. Dunno.

For every revolution of the excentric shaft, there is one combustion cycle per rotor. A two rotor engine has two combustion cycles per revolution that are 180degrees apart. by having the second engine having it's top dead center on the #1 rotor 90degrees after the first engine's #1 rotor, there would be a combustion cycle every 90degrees, which would be smother and produice more power since the greatest leverage is at the 90degree point. use a bicycle as an example. If you want to start moving on a bicycle, the greatest force you can put to the rear wheel is when the peddles are horizontal.

John

I would also run them as sepperat systems; ie cooling, fuel, ignition. I like the idea of using a universal or constant velocity joint. This sounds like a project I might try next spring.

John

Actually, Granny's shop kept the two motors in-phase to reduce the amount of stress on the coupling. Keeping the motors in phase syncronizes the torque pulses on both sides of the coupling. But it probably doesn't sound as cool as phasing the motors. :)