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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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#1 |
RCC Addict
Join Date: Mar 2008
Location: Honolulu, Hawaii USA
Posts: 1,813
Rep Power: 19 ![]() |
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... -Ted |
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#2 |
Waffles - hmmm good
Join Date: Aug 2008
Location: Huntersville, NC
Posts: 757
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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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1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs Project Fat Nikki Budget 12A rebuild Video setup < $30.00 |
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#3 | |
The Newbie
Join Date: May 2011
Location: UK
Posts: 9
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#4 | |
Waffles - hmmm good
Join Date: Aug 2008
Location: Huntersville, NC
Posts: 757
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Quote:
Rice, that was a great demonstration with the pics.
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1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs Project Fat Nikki Budget 12A rebuild Video setup < $30.00 |
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#5 | |
Don Mega
Join Date: Dec 2008
Location: Utopia
Posts: 1,688
Rep Power: 18 ![]() |
Quote:
![]() 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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www.riceracing.com.au Worlds best Apex Seals Coil on Plug Water Injection ECU Calibration |
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#6 | |
Sigh.....
Join Date: Feb 2008
Location: Murfreesboro, TN
Posts: 2,377
Rep Power: 20 ![]() |
Quote:
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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1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present." |
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