anyone know how to turbo a 21a and where can i get the stuff to do it?
anyone know how to turbo a 21a and where can i get the stuff to do it?
01-30-02, 05:10 PM
#6
RicanRider
Check Atkins Rotary at http://www.atkinsrotary.com they have a supercharger for a 12A, 13B, and 20B.....
Originally posted by trinimazdax
yeah ma bad i meant 12a , can u supercharge it if so how and where do i get the parts?
yeah ma bad i meant 12a , can u supercharge it if so how and where do i get the parts?
01-30-02, 05:31 PM
#7
EliteHardcoreCannuckSquad
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Originally posted by FuLLsMoKe
what does the 12a stand for?
what does the 12a stand for?
From Felix Miata's Site (http://mrmazda.members.atlantic.net/)
What do the 10A, 12A, 13B & 20B Mazda engine designations mean?
The numbers represent metric displacement. Power is generated from one face of each rotor per shaft revolution. 10 is the result of two 491 cc rotor chambers, 982 cc total, which rounds to 1.0 litres. 12 is the result of two 573 cc rotor chambers, 1146 cc total, which incorrectly rounds to 1.2 litres. 13 is the result of two 654 cc rotor chambers, 1308 cc total, which rounds to 1.3 litres. 20 is the result of three 654 cc rotor chambers, 1962 cc total, which rounds to 2.0 litres.
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 litre 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 litre 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 conjuction with a wider rotor, thus giving birth to the second (B) regular production rotary of nominal 0.65 litre displacement per rotor, the 13B. If Mazda were to create new two rotor engines of 0.60 and/or 0.65 litre 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.
What do the 10A, 12A, 13B & 20B Mazda engine designations mean?
The numbers represent metric displacement. Power is generated from one face of each rotor per shaft revolution. 10 is the result of two 491 cc rotor chambers, 982 cc total, which rounds to 1.0 litres. 12 is the result of two 573 cc rotor chambers, 1146 cc total, which incorrectly rounds to 1.2 litres. 13 is the result of two 654 cc rotor chambers, 1308 cc total, which rounds to 1.3 litres. 20 is the result of three 654 cc rotor chambers, 1962 cc total, which rounds to 2.0 litres.
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 litre 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 litre 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 conjuction with a wider rotor, thus giving birth to the second (B) regular production rotary of nominal 0.65 litre displacement per rotor, the 13B. If Mazda were to create new two rotor engines of 0.60 and/or 0.65 litre 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.
Last edited by smnc; 01-30-02 at 05:33 PM.
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01-31-02, 05:55 PM
#11
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Yeha and they are only saying a 30% increase in output...Is it worth it on a 12A? I have been pondering these questions, i think im gonna go 13B, streetported with a turbo... I think I can get a hell of a lot more horses this way... Hell I dunno, Im still confused but $$$'s are $$$'s and I got a few of them, but dont wanna waste them...
01-31-02, 06:21 PM
#12
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The problem is that the 12a has a high compression. Adding a well tuned turbo is therefore difficult as many people found in the 1980s.
A Jspec 12at is the way to go if you can find one, try Corksport or someone like that to get you an import. This produces 165hp in stock trim. The engine came without an intercooler, if you add a custom one then you can get some 175-180hp depending on your header and exhaust. Remember it is EFI when Jspec.
An alternative is to buy a good secondhand 13b turbo as a long engine, depending on model you will get 180-200 hp out of it. The local price varies considerably but will be cheaper and more reliable than adding a turbo to a stock 12a.
A Jspec 12at is the way to go if you can find one, try Corksport or someone like that to get you an import. This produces 165hp in stock trim. The engine came without an intercooler, if you add a custom one then you can get some 175-180hp depending on your header and exhaust. Remember it is EFI when Jspec.
An alternative is to buy a good secondhand 13b turbo as a long engine, depending on model you will get 180-200 hp out of it. The local price varies considerably but will be cheaper and more reliable than adding a turbo to a stock 12a.
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