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Rotary Tech - General Rotary Engine related tech section.. Tech section for general Rotary Engine... This includes, building 12As, 13Bs, 20Bs, Renesis, etc...

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Old 06-01-2011, 07:16 AM   #1
RETed
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Need to stop equating the rotary engine with a piston engine...
It's just not going to work.

If we take the definition of "displacement" for a piston engine, it's the volume displacement of combustion / intake / exhaust / etc. cycle given for two crankshaft revolutions.

If you try and apply this to the rotary engine, one side rotor is in the middle of one of the cycles.
Do you count this as a "half"?
That really doesn't make sense...


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Old 06-01-2011, 08:48 AM   #2
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I'm going to offer a non-techincal reason for why mazda and various other
makers of rotary products quote displacement the way they do. For the Mazda
case it makes all the 2 rotor engines less that 2 liters in displacment. From a
marketing perspective this is a big win especially in Europe and Japan where
heavy taxes get levied for anything over 2 liters.

I think trying to compare a rotary by displacement to a piston is a mistake
because they are so different in how they behave as they develop power.
I think the only way to compare them is by power and torque. A 13B is
very similiar in power to a 6 cylinder except that the torque is low at low rpms.

I'm talking a stock NA sort of 13B. I know if you slap a turbo on it and stuff
its a v8 killer but thats a whole different animal.
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Old 06-02-2011, 09:16 AM   #3
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Quote:
Originally Posted by t_g_farrell View Post
I'm going to offer a non-techincal reason for why mazda and various other
makers of rotary products quote displacement the way they do. For the Mazda
case it makes all the 2 rotor engines less that 2 liters in displacment. From a
marketing perspective this is a big win especially in Europe and Japan where
heavy taxes get levied for anything over 2 liters.
It's not that because for taxation reasons it gets classed as a 2.6L anyway...
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Old 06-02-2011, 09:36 AM   #4
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Quote:
Originally Posted by PhillipM View Post
It's not that because for taxation reasons it gets classed as a 2.6L anyway...
Wow! That does suck then.

Rice, that was a great demonstration with the pics.
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Old 06-03-2011, 06:54 PM   #5
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Quote:
Originally Posted by t_g_farrell View Post
Wow! That does suck then.

Rice, that was a great demonstration with the pics.
no worries

and yes taxation is based on equivalence (to std common/majority 4 stroke reciprocating engines) and thus in 720deg the 13B does inhale (suck!) or partially displace 2616cc as shown............... but as we all know and can see it has NOT completed its full Wankel Cycle in that time, this only happens in 3 full revolutions of 1080deg.

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Old 06-02-2011, 09:38 AM   #6
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Quote:
Originally Posted by PhillipM View Post
It's not that because for taxation reasons it gets classed as a 2.6L anyway...
Of course Mazda says it's a 1.3L. It would be stupid for them to call it anything else from a marketing standpoint, regardless of taxation.

I don't want to buy a 3.9L or 2.6L engine that makes 146hp. I want to buy a 1.3L engine that does.
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