Rotary firings

[Gary Derian]

The gearing may be 3:2 but as the inner gear rolls around the outer gear,
you get an extra revolution relative to the case so the crankshaft does turn
3 times for every revolution of the rotor.  The rotor fires 3 times per
revolution so each rotor fires once per crank revolution, like a 2 stroke
piston engine.
Gary Derian <gderian at cybergate.net>



>>At 11:06 PM 9/16/98 -0400, you wrote:
>>>Just a tad rusty here, but (on a 2 rotor rotary), aren't the rotors, and
>>>shaft geared at 1:1,so at 1K rpm there are 2K exhaust pulsations?...
>>>  Where as in a 2 cylinder 4 stroke would only have 500 pulsations
>>>per minute at 1K rpm idle?.
>>>  EFI content is that this is in reference to O2 sampling.
>>>Cheers
>>>Bruce
>>>
>>Actually it would be more like 4000 pulsations at 1k
>>
>>If I remember correctly the ratio of the ring gear to stationary gear on
>>the housing is 3 to 2, so at 1k rpm of the eccentric shaft we have 666,66
>>rotor rpm, there is 3 rotor faces so 666,66 x 3 = 2000 exhaust pulses
times
>>2 rotors for a grand total of 4000 exhaust pulses at a 1k idle.
>>
>>Alain Marchildon
>
>BINGO!!
>
>Regards, Greg
>