Coolidge

Wait a minute... then what's up with this picture?
http://abacus.sj.ipixmedia.com/abc/M...4c0fe5/i-1.JPG

That's how all the pictures of rotor's i've seen before are. Are they hollow rotors with a plate/cover thing on one side? If so, why?

lesd

I'd hold off getting the engine from that 'Family car' and wait to see what Mazda introduces as a sports car. Then you can dream of that engine
I'd guess they do either a 3 or 4 rotor engine, NA, or maybe even a piston engine.

Sure, Mazda would sell the engine as a replacement, to guess the pice, ask the parts counter at the dealer for the price of an ABS unit for an FD..... $2500.... so I'd put the rx8 engine at $12,000 or so.


-Les

peejay

They're all hollow. The picture on the first page is a rotor cut apart to demonstrate the internal fins and braces. Oil is injected from the eccentric shaft into the rotors to keep them cool. The oil is 30-40% of the rotary's cooling system because of this, and is why HUGE oil coolers are necessary. (as well as using good quality oil and keeping an eye on oil pressure and temperature)

If the rotors were solid, they'd not only weigh probably 30-40 pounds instead of 9.5lb or so, but they would quickly overheat and expand to the point where they'd seize inside the engine.

rxrotary2_7

i doubt it will be 12k....a stock intercooler new from the dealer is 1200, one new seat is about 2k, but you cant price other parts, or a motor due to the fact that the abs cost 2500 for an fd. then how much should a new spark plug cost for this new rx8?
a remaned fd motor is only like 1600-1900 plus core....i dont know where you got 12k, but alright if you think so.
i will agree that it will "probobly" be more than an FD motor to start out with, but nowhere near 12 large.....

Jerk_Racer

I just thought from the beginning of this thread that this would be too much money just to make a N/A FC quicker with a newer N/A engine. I guess this idle talk is bench racing at it's best. Kind of like the loads of people that wonder how much a 20B swap would be. The question is asked without any follow through by those asking. There are a few that have the cajones to put their money where their mouth is, but they are a small group. I can see putting a 20b into a FC, but a Renesis 13B. One engine has been out for over a decade, the other is yet to come.

jerk_racer@hotmail.com

REVHED

I read somewhere that the engine dimensions are different hence the name Renisis and not 13B. This means parts intherchangeablity between the two will be highly unlikely.

rx7_ragtop

We don't use offensive "racial" terms on here... WARNING #1.

Brad

Coolidge

You can't say anything anymore without it being offensive, no matter what it is or how it's meant (in this case, in a good positive way). Anyway.. sorry to those it offends.

SureShot

I really expect that the renesis engine gets as much HP as can be had from the NA 1.3 twin rotor. If you really look at the cutaways, you'll see 2 throttle bodies, two separate induction systems, and I think I see a 4 port exhaust header (no detune box). The January press release specifically mentions closeable aux intake ports and dual electrinic throttles. I want one for my 91 when the 13B dies..

SureShot

Here's the quote:
In addition, the adoption of dual exhaust ports for each chamber achieves twice the port area of conventional designs and also allows exhaust port timing to be delayed for increased thermal efficiency in the expansion process. Unburned hydrocarbons are retained for combustion in the next cycle, which greatly reduces emissions. A three-stage induction system, featuring shutter valves at the intake ports of each rotor, utilizes the incoming air’s dynamic charge effect and improves filling efficiency, while twin electronic throttles precisely and flexibly control the valve operation.

SureShot

This picture shows the intake port shutters and the huge side ports.

Henrik

Low peak torque is a red herring, its the power that's important and even more so the power curve. The only place torque matters is at the rear wheels where it gets turned to force which is what makes you go and keep going. Power can be turned into torque (through your gearbox, diff and tires), torque can't be turned into power. To make a high HP/low torque car fast, you stay at higher RPMs in a lower gear.

Henrik
87TII