ATDC, ABDC, BBDC a ? for the gurus
ATDC, ABDC, BBDC a ? for the gurus
what is top dead center and bottom dead center considered on a rotary? I would guess the point of highest compression for ATDC which if my math is correct is every 120* of rotar rotation (360/3). but then also what is the ratio of E-shaft rotation to rotar rotation? because ignition timing is based off the crankangle sensor which measures E-shaft position correct? but is port timing(that is givin in service manuals) based on rotation of the rotar or the E-shaft? now if you can makes sence of any of that and know a thing or two i would appreciate the addition of your knowledge 
HAILERS
Joined: May 2001
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From: FORT WORTH, TEXAS,USA
Joined: Mar 2001
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From: https://www2.mazda.com/en/100th/
if you had a piston engine this is basic stuff, funny on a rotary is not.
the rotors are 3:1 vs the eshaft, so a 2 rotor fire every 180 degrees or e ahft rotation, just like a 4 cyl. the cas/distributor is geared to run half of e shaft speed, again like an uppy downy motor. tdc is when the face of a rotor is closest to the spark plugs, on a 2 rotor its every 180degrees of e shaft rotation.
the rotors are 3:1 vs the eshaft, so a 2 rotor fire every 180 degrees or e ahft rotation, just like a 4 cyl. the cas/distributor is geared to run half of e shaft speed, again like an uppy downy motor. tdc is when the face of a rotor is closest to the spark plugs, on a 2 rotor its every 180degrees of e shaft rotation.
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jeremy
2nd Generation Specific (1986-1992)
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Apr 20, 2003 02:13 PM
