12A Engine Problems or misunderstanding
11-23-05, 11:23 PM
#1
"Sweet Homeee, RX-7!"
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12A Engine Problems or misunderstanding
Hey just a simple question.
Why is it called 12A when its 1.1L
I always knew it was the engine code but the 13B is 1.3L and 20B 2.0L is this just a quincidence or not.
So please shed light on my question who thanks.
Nathan
Why is it called 12A when its 1.1L
I always knew it was the engine code but the 13B is 1.3L and 20B 2.0L is this just a quincidence or not.
So please shed light on my question who thanks.
Nathan
11-23-05, 11:49 PM
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thats a good question. cant really answer it, but i did find some interesting info on displacement of other rotary engines
http://www.answers.com/topic/mazda-wankel-engine
http://www.answers.com/topic/mazda-wankel-engine
11-24-05, 12:33 AM
#6
Mazda incorrectly rounded up.
1.146L - someone supposed that the 6 should cause the 4 to round up, and then it would be a 5 and so it should round up again!
Things in Mazdaland don't always make sense. Take the 13G for example. It was a 3-rotor engine, like the 20b it was 2.0L. Doesn't make sense.
I guess they thought it would be more impressive to say it's a 1.2L instead of a 1.15L
Jon
1.146L - someone supposed that the 6 should cause the 4 to round up, and then it would be a 5 and so it should round up again!
Things in Mazdaland don't always make sense. Take the 13G for example. It was a 3-rotor engine, like the 20b it was 2.0L. Doesn't make sense.
I guess they thought it would be more impressive to say it's a 1.2L instead of a 1.15L
Jon
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11-24-05, 03:02 AM
#8
Originally Posted by wikipedia
In Le Mans racing, the first three-rotor engine used in the 757 was named the 13G. It was renamed 20B after Mazda's naming convention for the 767 in November of 1987.
The three-rotor 20B-REW was only used in the 1990-1995 Eunos Cosmo. It was the worlds first volume production twin-turbo setup featured in both 13B-REW & 20B-REW form. It displaced 1962 cc (three 654 cc rotors) and used .7 bar of turbo pressure to produce 300 hp (224 kW) and 300 ft.lbf (402 Nm). It was at the time the highest torque output engine of any Japanese vehicle manufacturer.
13J
The first Mazda four-rotor engine was the 13J used in the 1988 767 Le Mans prototypes. It was based off the 13G used previously and the later 26B. In racing form it proved unsuccessful requiring a new design of the 4-rotor engine thus evolving into the 26B engine
11-24-05, 05:32 PM
#9
Savanna Rx-7
Originally Posted by rxtasy3
12A=1146cc=1.1L
13B=1308cc=1.3L
don't really know why they called it a 12A. but then again, does it REALLY matter?
13B=1308cc=1.3L
don't really know why they called it a 12A. but then again, does it REALLY matter?
its not mazda that does that, its the Land Transportation Office (jappanese version of the DMV) they only allow 3 digits includeing the decimal, and if it over at all it goes up to the next hence the 1.14=1.2
the 13G was never in a production car, hence no need to follow conventional naming procedures.
kenn
11-25-05, 02:45 AM
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Actually, I think it was called the 13G because it was simply a 13B with an additional rotor. ^_^ Although, they did say in the wiki that it was completely redesigned for the 26B.
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