Rotary Engine Naming Conventions...
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It's Not Easy Being Green
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From: Akron, OH
OK... here is the link to the page that explains the naming convention:
http://turborx7.com/faqs.htm
Very informative site and good to browse through the various pages on the left side... especially under the 'Basics' section.
Also, at the bottom (left pane) you'll see a 'RX-8 Renesis Info/Specs' area:
http://turborx7.com/rx8renesis.html
I've mentioned in the past that its good for everyone to observe the Renesis Module flash animation to better understand whats going on under the hood.
This is where you can download the animation module.
http://turborx7.com/faqs.htm
Very informative site and good to browse through the various pages on the left side... especially under the 'Basics' section.
Also, at the bottom (left pane) you'll see a 'RX-8 Renesis Info/Specs' area:
http://turborx7.com/rx8renesis.html
I've mentioned in the past that its good for everyone to observe the Renesis Module flash animation to better understand whats going on under the hood.
This is where you can download the animation module.
The letters "A" & "B" represent the combination of two basic production engine configuration parameters, "eccentricity" and "generating radius". The "A" is applied to the first (A), and only, combination of the two specifications actually deployed in a regular production engine of nominal 0.60 liter displacement per rotor, the 12A. The "A" was also applied to the first (A), and not only, combination of the two specifications actually deployed in a regular production engine of nominal 0.65 liter displacement per rotor, the low production 13A. Mazda later determined greater economy could be achieved by using the 12A's combination of eccentricity and generating radius in conjunction with a wider rotor, thus giving birth to the second (B) regular production rotary of nominal 0.65 liter displacement per rotor, the 13B. If Mazda were to create new two rotor engines of 0.60 and/or 0.65 liter displacement per rotor using some different combination of generating radius and eccentricity, application of the same logic previously applied by Mazda in naming its rotaries would give birth to a 12B and/or a 13C.
Engine Eccentricity Generating Radius
10A, 12A, 13B, 20B 15 mm 104 mm
13A 17.5 mm 119 mm
Eccentricity
the distance from the center of eccentric shaft rotation to the center of the rotor
Generating radius
the distance from the center of the rotor to its apex.
Engine Eccentricity Generating Radius
10A, 12A, 13B, 20B 15 mm 104 mm
13A 17.5 mm 119 mm
Eccentricity
the distance from the center of eccentric shaft rotation to the center of the rotor
Generating radius
the distance from the center of the rotor to its apex.
Oh and I love the animations. Rotaryillustrated.com has a ton of them too plus they have 'exploding/contracting' animations of the engine.
Grand Chancellor
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From: Home of the NIMBYs
So Mazda went as far as ver. B then with the 1.3l Wankel. Theoretically if the 16x goes into production then it will renamed to 16A correct?
Also I notice some 13b has REW suffix to it. What does that mean?
Also I notice some 13b has REW suffix to it. What does that mean?
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It's Not Easy Being Green
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From: Akron, OH
I think that's why there was a 13G and 13J. They probably had even more experimental versions of them but eventually the distances used once they converted them to 3-rotor engine made them into the 20b and 26b. Had either of those ever made it into a 2-rotor production version they would have maintained their lettering.
I think if I spent some time figuring out the history of the 3-rotor it'd be clearer since the 20a was probably built off a 13b and not the 13a. The 20b was built off of the 13g/13j.
Keep in mind Mazda only labels them when they go into production so people who have built 20b's out of different 13b's might be mislabeling their 3-rotor engine...
Last edited by RK; Aug 15, 2008 at 02:41 PM.
Mazda were to create new two rotor engines of 0.60 and/or 0.65 liter displacement per rotor using some different combination of generating radius and eccentricity, application of the same logic previously applied by Mazda in naming its rotaries would give birth to a 12B and/or a 13C.
The way I took this was that each letter grouping is specific to the radius and eccentricity.
This is why the 13B and 20B have the 'B'... because the radius and eccentricity are the same, just the 20B has an extra rotor (hence the '20').
If the radius and eccentricity changes (different than the 'A' or 'B'), then it "should" become a C.
I'll try to research this more (after I take some Advil).
Last edited by Jon316G; Aug 15, 2008 at 05:33 PM.
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It's Not Easy Being Green
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From: Akron, OH
In the above quote, the '12B' reference makes it a little confusing to me... I can understand the '13C'.
The way I took this was that each letter grouping is specific to the radius and eccentricity.
This is why the 13B and 20B have the 'B'... because the radius and eccentricity are the same, just the 20B has an extra rotor (hence the '20').
If the radius and eccentricity changes (different than the 'A' or 'B'), then it "should" become a C.
I'll try to research this more (after I take some Advil).
The way I took this was that each letter grouping is specific to the radius and eccentricity.
This is why the 13B and 20B have the 'B'... because the radius and eccentricity are the same, just the 20B has an extra rotor (hence the '20').
If the radius and eccentricity changes (different than the 'A' or 'B'), then it "should" become a C.
I'll try to research this more (after I take some Advil).
They've done more configurations with 13s up to at least 13L but we haven't seen any of those become available in a 2-rotor production line. And while the RENESIS was a change in a lot of things the dimensions and output remained the same so it maintained the 13B designation.
So if the 16x, when it makes it to production, will likely be a 16A since it will be the first eccentricity/apex distance production design with a 1.6L output.
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