ok, ok. the word is out, im am a complete rotary idiot. I currently own a dsm (91 talon AWD) and i have no knowledge of the workings of the rotary internal combustion engine. All i know is that instead of 4,6,8 or more pistons moving up and down or however the engine block permits to spin a crank and spin a fly wheel and subsequent driveline and periferal fuctions of the motor, the rotary engine uses a number (which i don't know) of rounded triagularly shaped rotors that produce the change in atmosphereic pressure around the inside of the oval shaped combustion chamber, therefore producing the same effect as the standard internal combustion engine. This is all i know, which is less than elementary. I really want to know the details as i am extremely interested in the workings of this alternative motor style. please respond with some helpfull info. and is it true that it is pointless to run anything smaller than a t34 on an rx7.

ps sorry about the bullshit post, i really didn't know...

 

How a Rotary Engine works:
http://travel.howstuffworks.com/rotary-engine.htm
The above article should be a great start for you.

Here are a few good links:
www.rotaryengineillustrated.com
www.rotarynews.com
www.fc3s.org
www.fc3s-pro.com

Generally rotary engines are 2-rotor engines (2 combustion chambers). All production rotary engines made my Mazda since the early 80's have been 13B engine designs, except for in Japan there was a mazda cosmo which had a 20B.

1st Gen RX-7s (79-85) had a 12A engine in earlier years and then a 13B in later years.

2nd Gen RX-7s (86-91) had 13B engines, with a turbo model being offered in 87-91.
13B = 1308 cc (1.3L)

3rd Gen RX-7s (92-02) had 13B engine, with twin turbochargers.

A Mazda Cosmo 20B engine is basically a 3rd Gen RX-7 engine with a 3rd rotor on it, so it's 1962 cc (2.0L) and twin turboed.

RX-8 (03+) has a RENESIS engine which is a new rotary, based on the 13B design. Still same displacement, but the main differences being the type of exhaust porting on the engine. Only an NA model is being made right now - one with 210 hp and one with 250 hp.

 

I just uploaded this to my webpage for you.
It is animations of the engine and explanation of how it works.

http://www.geocities.com/bported/animations.html

Here is another really good page. It shows the rotary in comparison to the piston engine at each point in the combustion cycle. Also has glossary of rotary engine parts terms.

http://members.tripod.com/~HARDEBECK/engine.htm

 

A t3 hotside is way too small for 13B, those are woman honda turbo's, we use manly turbo's

 

so what is the smallest turbo one would go if one really wanted to move but still wanted the street drivablity?


turbos go: Psssssssssssssssssssssssssssssssst!!!!!!

 

An easy way to detimine what turbo would suit what you want from your RX-7 well is by doubling the displacement to get the theoretical displacement (so 2.6L) and then looking up what turbochargers guys on 2.5 - 3.0L piston engines are upgrading to.
Generally it seems Supra owners and RX-7 owners upgrade to the same types of turbochargers.

 

There are tons of threads on turbo sizing,
but I the common denominator is t4 flow.
I bought a new to4e on ebay for $400,
I didn't get to choose the a/r's but the
car only runs 7psi and it is a **** ton load faster
than it was. If I had money to blow I would
have gotten a 60-1.
jp

note:
**** ton load = a lot more

 

so what you guys are saying is that rx7's can spool turbos that normally take a larger displacment motor to spool, so you can put a bigger turbo on a smaller motor with the rotary engine. Is this becuase of how the exhaust manifold (s) are set up on the rotary engine?

 

The smallest turbo I would every put on an rx7 is a 20g, was gonna get a 25g. sevens spool turbo's like 6 cyl rather than a four.

 

Yes, exactly that.
Nope, it's because the rotary engine has such hot exhaust gases. The hotter the exhaust is, the more energy there is in it, and the faster the turbo spools. That's why some piston guys put wrap on their exhaust manifolds, so it retains the heat for the turbocharger, and makes it spool up a bit quicker.