Rotary firings

Greg Hermann bearbvd at sni.net
Fri Sep 18 01:45:47 GMT 1998


>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





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