Actual Rotary Displacement Request

[RICE RACING]

Barry, ALL of the total sum faces fire once in 1080 degree's, nothing more nothing less.

Like I tell my students, you need to take time out and see the pictures, if you don't get it at first do not worry you are not the first and not the last to get confused on how internal combustion engines work.

2 stroke
4 stroke
Wankel

Its pretty simple really.

[RICE RACING]

For EVERYONE remember this.

In 360 deg
ALL CYLINDERS in a 2 stoke fire once! no matter if its single or a V16!

In 720 deg
ALL CYLINDERS in a 4 stroke fire once! no matter if its a single or a V16!

In 1080 deg
ALL faces of a rotary wankel fire once! no matter if its a single rotor or a 4+ rotor!

Which ever formula you decide to use in your PISTON applications you need to know which EQUIVALENCE displacement to use (2 stroke, 4 stroke or wankel) there are no aftermarket ECU's set up to run the true Wankel cycle or count the individual rotor faces based of its ACTUAL cycle (which is only 1080deg, nothing less)......... so you just need to know how a motor works and apply the other piston engine formulas to the wankel as appropriate (as I showed all of you)

[Libor]

Originally Posted by RICE RACING

there are no aftermarket ECU's set up to run the true Wankel cycle or count the individual rotor faces based of its ACTUAL cycle

Peter, I was curious about something. Would there be any benefit in engine control with ECU of such abilities? Like better fueling of individual chambers?

[RICE RACING]

Originally Posted by Libor

Peter, I was curious about something. Would there be any benefit in engine control with ECU of such abilities? Like better fueling of individual chambers?

There are some of us who are using this kind of bespoke *aftermarket* true rotary ECU and have been doing so for a long time!

Yes there are major benefits!
Mazda racing ECU's and stock ECU's are of this type 1080 deg true Wankel cycle, it is the only way to truely look at the engine.

Otherwise you do need to do alot of conversions to adapt all the other ECU's, not to hard to do, but most dont get it, especially when you are looking at things like control of injector opening and closing degree's etc.

[scotty305]

Interesting question, Barry.

Originally Posted by RICE RACING

There are some of us who are using this kind of bespoke *aftermarket* true rotary ECU and have been doing so for a long time!

Yes there are major benefits!
Mazda racing ECUs and stock ECUs are of this type 1080 deg true Wankel cycle, it is the only way to truly look at the engine.

Otherwise you do need to do a lot of conversions to adapt all the other ECUs, not to hard to do, but most don't get it, especially when you are looking at things like control of injector opening and closing degree's etc.

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.


In a similar fashion, you could compare a 1.3L two stroke piston engine to a 2.6L four-stroke piston engine... both ingest the same amount of air in 720 degrees, but the 1.3L two-stroke occupies less space and will weigh less assuming similar materials are used to build both engines. Is this starting to sound familiar? If I'm not mistaken, the two-stroke should have less torque at low RPM greater fuel consumption than the four-stroke. I'm not an engine expert (rotary or piston) so please correct this if I'm wrong.

[RICE RACING]

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]

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

[Barry Bordes]

Originally Posted by RICE RACING

Barry, ALL of the total sum faces fire once in 1080 degree's, nothing more nothing less.

Like I tell my students, you need to take time out and see the pictures, if you don't get it at first do not worry you are not the first and not the last to get confused on how internal combustion engines work.

2 stroke
4 stroke
Wankel

Its pretty simple really.

Actually example (3) (shown below) would take 1440º and

example (4) would take 1800º to complete all faces of its trochoid shape.

Different rotor/stationary gear ratios would be used to accommodate the 4 in 3 and 5 in 4 trochoid mesh.

Barry

[RICE RACING]

I am ONLY refering to the Wankel Rotary I pictured and as we all use, drive and modify

Nothing else