Actual Rotary Displacement Request

RICE RACING · 06-03-2011, 12:48 AM

Quote:

Originally Posted by scotty305

Interesting question, Barry.

Mazda stock ECUs are only capable of measuring 360 degrees of eccentric shaft rotation; since the trigger wheel is mounted on the eccentric shaft it cannot discern the difference between one rotor face vs the other three. As far as the ECU is concerned, the rotary may as well be a two-cylinder two-stroke that displaces 1.3L per 360 degrees.

I'm not an engine expert (rotary or piston) so please correct this if I'm wrong.

No mate they use 1080 in programming and can measure it with a 360 wheel on the crank

You may not know where each individual rotor face is but that is not an issue so far as knowing the actuall Wankel Cycle and when to trigger things.

j9fd3s · 06-03-2011, 06:00 PM

Quote:

Originally Posted by RICE RACING

No mate they use 1080 in programming and can measure it with a 360 wheel on the crank

You may not know where each individual rotor face is but that is not an issue so far as knowing the actuall Wankel Cycle and when to trigger things.

ah yes, good point! one of the rotary ADVANTAGES is that each stroke is 270 degrees instead of 180 like a piston engine.

you are wrong though, piston engines suck all the time

mike

RICE RACING · 06-03-2011, 06:16 PM

Just remember

Each engine is only *honestly* rated for displacement AFTER (ALL OF ITS ELEMENTS) have completed one cycle of work.

Elements = ALL individual combustion faces
Cycle = defined by power pulse (or simply spark firing) *remember suck sqeeze bang blow*

It's not a hard concept to fathom honestly ......... some always struggle cause they don't know how the 2 storke or 4 stroke or Wankel actually work though!

Define the cycle!
Count the faces!
There is your answer for displacement!

Equivalence (like I mentioned in my second post) can be used to compare the 13B to other non wankel cycles (as defined by time to displacement), IE displaces 1308cc in 360deg or 2616cc in 720deg, but it only does its wankel cycle in 1080deg which my friends = 3924cc in 13B form, nothing less!

06-03-2011, 06:16 PM	#3
RICE RACING Don Mega Join Date: Dec 2008 Location: Utopia Posts: 1,688 Rep Power: 18	Just remember Each engine is only honestly rated for displacement AFTER (ALL OF ITS ELEMENTS) have completed one cycle of work. Elements = ALL individual combustion faces Cycle = defined by power pulse (or simply spark firing) remember suck sqeeze bang blow It's not a hard concept to fathom honestly ......... some always struggle cause they don't know how the 2 storke or 4 stroke or Wankel actually work though! Define the cycle! Count the faces! There is your answer for displacement! Equivalence (like I mentioned in my second post) can be used to compare the 13B to other non wankel cycles (as defined by time to displacement), IE displaces 1308cc in 360deg or 2616cc in 720deg, but it only does its wankel cycle in 1080deg which my friends = 3924cc in 13B form, nothing less! __________________ www.riceracing.com.au Worlds best Apex Seals Coil on Plug Water Injection ECU Calibration