What are the main differences between 13b and 3rd gen motor?
 

as tital says also what difference's with RX8s and the wankle???

um.... need to get a few things straight. I will be nice and not flame since it sounds like you are just getting into this.

the 13b is a designation given to the 2 rotor 1.3l displacement engine. There are multiple series of the 13b each with their own differences. the Renesis is a 13b, however it has side port intake and exhaust, where the previous 13bs had peripheral port exhaust with side port intake.

All of the rotary engines in Mazdas are the Wankel design. That is the name of the inventor. (I think) the second generation RX7 also came with a 12a prior to the introduction of the 13b into the FC chassis.

Hope this helps, try googling some info, you will pull up more than you care to remember.

the multiport indcution method on the rx8

What is the Renesis and Wankel engine difference?

The Rx-8 utilizes a Renesis Engine and the rest of the 7 series uses a Wankel, correct?

Is it just the intake/ exhaust porting?

Someone told me that the Renesis is a 4 stroke and the Wankel is a 2 stroke.

Not sure if that is true, but I just haven't gotten around to researching the topic.

I also heard that the Rx-8 is N/A and is carburated.

Honestly the Rx-8 doesn't really appeal to me, so I haven't really researched them at all.

So I'll just take advantage of this thread to learn a little about the newest installment to the rotary community.

the rx8 is not carburated.

all rotary engines are called wankel engines, named for felix wankel, the inventor. btw, what's up blake? ^^ anyway, they are all 4 stroke. they do burn oil as part of the way they are designed, but they are 4 stroke. the 3rd gen motor came stock twin-turbocharged, and the renesis is na. different port designs and stuff. stronger, lighter eccentric shaft in the renesis, also interchangeable into the 7. basically, the 8 sucks balls and the 7 can't lose!

mazda hasn't made a carburated rotary since 1985. all RX-# cars have been 13b's since 1986, its kinda like their "SBC", mazda just revises and try's to improve upon the same basic design, making them more powerfull, more effeciant, and longer lasting (even though its not unheard of to find first gen rx-7's w/ over 200k miles on the original motor, i guarantee you cant say that about the 13B-T or 13B-REW ;) and the jury is still out on the 13B-MSP aka.RENESIS)

Wankel comes from Felix Wankel, the inventor of the rotary engine.

Hence

All rotaries are referred to as wankels.

The 13b that comes in the RX-8 was titled "Renesis" by Mazda so it would have a cool name and bring interest into the re-emerging rotary engine. It has all the latest bells and whistles and Mazda wanted to make a big splash. The physical differences have been explained above, so in short.

All rotaries are wankels.

all recent mazda rotaries are engine code 13B base, but can have add ons on the designation like 13B REW or 13B RE, but all are a base 13B now.

The renesis is fuel injected and naturally aspirated.

As for stroke, think of it kind of like an otto cycle 2 stroke motor, and if that doesn't confuse you, I don't know what will ;)

Go to www.rotaryengineillustrated.com to get pics and more in depth material on rotaries in general, along with some good movies and pictures.

FD = fast
RX-8 = slow
And that's the MAIN difference...


-Ted

oh oh oh oh....

FD = 2 doors
RX8 = 2.5 doors

I forgot about that until just now.

Only Mazda-built Wankels can properly be called rotaries. Mazda was the only engine manufacturer to just call them "rotaries", everyone else called them Wankels or Wankel rotaries. Given that Mazda was the only one to (officially) make them work as a viable commercial product, they have that right.

No FC in North America was ever sold with a 12a engine. In fact in all my military trips to Japan I've never heard of an FC being sold there with a 12a either.

yeah everyone else refferred to them as WRCE, wankel rotary combustion engine. Mazda just said rotary.

I think the RX8 has reached the maximum amount of HP of out an na design. Wheres teh turbo RX8 comingout

I concur.

They did make a 12aTurbo but only for japan

i think it was also available for australia...

and it was only for the first generation (fb) cars....

third gen. motor lower intake manifold will not bolt up to second gen. motor, or vise-versa...

first, second and third generations motor mounts were all different from one another...
like the other guys said, not to flame you but do a search... there are to many small differences to list all of them... what are you trying to accomplish???

the NSU manual says "rotary piston engine"

the 12a was dropped in 85, no production FC had a 12a, anywhere. the 12a turbo went into the 1st gen chassis.

if you wanna be really picky, what we call the 13b-re is sorta wrong, the factory manuals call it a 13b-REW, just like the FD engine. REW refers to the twin turbo setup.

Direct injection will probably lead to a few more hp through increased timing. they could probably do a 3 rotor here if they felt the desire to. With direct injection and something similar to displacement of demand they migth be able to swing it here. I doubt it's going to happen.


BC