Originally Posted by scotty305
(Post 7526356)
If I had to guess, I'd say it won't see forced induction for the first few years, if ever. I've heard horror stories about what happens to Renesis motors when they blow apex seals: without a peripheral exhaust port, there's not an easy place for the broken seals to get puked out of the motor, they stay inside and chew things up for a while. It would be a shame to risk the reputation of the new platform, I think it would be wiser to add another rotor than to add a turbocharger.
-s- |
its seems as if this engine may be better suited to boost than the original renesis.
correct me if im wrong but shorter housings mean shorter apex seals which means better resistance to breaking(less breaking points). higher displacement generally handle boost better too i think. more surface area to cool means less chance of detonation and apex seals bouncing around. |
Originally Posted by hhn2002
(Post 7539308)
its seems as if this engine may be better suited to boost than the original renesis.
correct me if im wrong but shorter housings mean shorter apex seals which means better resistance to breaking(less breaking points). higher displacement generally handle boost better too i think. more surface area to cool means less chance of detonation and apex seals bouncing around. |
Looks Nice
|
do you think a high compression engine (since its built to withstand higher pressures) would respond to insane amounts of boost with a water/meth injection kit and really good tune? just a thought
|
Does anyone know how wide these new rotors are? I have... ideas.
|
Originally Posted by Jeff20B
(Post 7539745)
Does anyone know how wide these new rotors are? I have... ideas.
|
The side exhaust is supposed to help with emissions to keep the unburnt hydrocarboms in the engine to get burnt, rather than being emitted as a pollutant. I think it was supposed to help milage too somehow. So while peripheral may be better for performance I don't think they can get it to pass smog any more.
|
Originally Posted by Black91n/a
(Post 7539766)
The side exhaust is supposed to help with emissions to keep the unburnt hydrocarboms in the engine to get burnt, rather than being emitted as a pollutant. I think it was supposed to help milage too somehow. So while peripheral may be better for performance I don't think they can get it to pass smog any more.
|
dam, i didnt notice i just about said everything u did
|
While it may be "bad for power" the RX-8 does have the most powerful NA rotary ever produced from the factory, so a side exhaust can't be that bad.
|
As I've posted in other threads, there is more to power than just flow. Port timing has a huge effect. This is why the Renesis does so well. It's not because of the compression ratio or the intake manifold. The Side exhaust port timing is better suited to a street engine in terms of power, emissions, and as a match for the intake port timing. The Renesis doesn't even have port overlap and many claim this is needed for good power. It's not. There are many misconceptions about flow and timing. I actually wish Mazda would develop an all side port race engine.
|
Originally Posted by Jeff20B
(Post 7539745)
Does anyone know how wide these new rotors are? I have... ideas.
|
Originally Posted by rotormind
(Post 7539801)
yah but the rx8 still didnt get good gas milage. i think they need to figure out more on the peripheral exhaust. the side exhaust is better on emissions because they r able to send the unburned carbons back into the combustion chamber. the problem is, its a waist of power
|
Originally Posted by RotaryBred
(Post 7539334)
you are correct about the apex seals, but someone correct me if I'm wrong - a high compression engine is a high compression engine. once that compression hits a certain PSI, no more boost can be pushed in. That is why the renesis is impossible to see much HP gain from compared to the previous 13b models.
I think the problem with a boosted renesis engine is the lack of proper stand-alone engine management. The hot ticket among turbo rx8 owners seems to be the the GReddy e-manage which as the greddy site says it best "as close to a stand-alone management system as you can get while maintaining the best features of a "piggy-back" engine management". The first key ingredients in any reliable high HP (350+ rwhp) rotary is stand-alone engine management. |
Originally Posted by rotarygod
(Post 7540550)
I've heard 2 rumors but don't know for sure. One says 70mm like the 12A, and another says 75mm.
from a Japanese website 10A e=15mm R=105mm b=60mm Vh=491cc 13A e=17.5mm R=120mm b=60mm Vh=655cc 12A e=15mm R=105mm b=70mm Vh=573cc 13B e=15mm R=105mm b=80mm Vh=654cc プロトタイプ 12A'(12A量産前に検討されたエンジン) e=16.4mm R=112mm b=60mm Vh=573cc 21A e=18.5mm R=128mm b=85mm Vh=1046cc 22A e=18.5mm R=128mm b=95mm Vh=1169cc 15A e=15mm R=105mm b=90mm Vh=737cc And their guess for 16X is 16X e=17.5 R=122.5 b=70 Vh=797cc |
Originally Posted by TweakGames
(Post 7525989)
true true I feel bad building a 13b right now though knowing I could have the extra .3L. A 20B has 33% increase .... a 16x is just short of a 20b... O.o
You need to redo your math. 13B = working displacement compared to a 4cycle engine = 2.6L 16X = working displacement compared to a 4cycle engine = 3.2L 20B = working displacement compared to a 4cycle engine = 3.9L 3.2/2.6 = 1.23 or 23% larger 3.9/2.6 = 1.50 or 50% larger :dunno: |
This should have better low end torque
|
interesting motor.. its definatly a prototype, the oil filter pedastal mount only has one hole, how do ya like that?!
|
i have some SAE papers with details on the side port design if someone is interested pm me.
Developed Technologies of the New Rotary Engine (RENESIS) by: Masaki Ohkubo, Seiji Tashima, Ritsuharu Shimizu, Suguru Fuse and Hiroshi Ebino. Mazda Motor Corporation |
Sweet Jesus Love It
|
Originally Posted by RotaryBred
(Post 7539249)
i'm still puzzled as to why they are still doing the side port exhaust. you think they would've learned that more power can be harnessed with peripheral ports which would make the sale of the car more appealing to the young and old, and raise gas milage since it is much less restrictive. Old people dont want 8's because the gas mileage sucks, and young people (who care about going fast) don't want them because in order to get and real power outta them, you might as well do away with the whole engine!
|
Originally Posted by 680RWHP12A
(Post 7541278)
... the oil filter pedastal mount only has one hole, how do ya like that?!
Originally Posted by rotarygod
(Post 7540554)
Put a 4.44:1 rear end in your car and add 400 lbs and see how good your mileage is! If you had a Renesis in your car, you'd get better gas mileage than you do now. You need to look at the entire package. The RX-8 actually gets comparable gas mileage to the much lighter and less agressively geared RX-7's.
|
Maby the oil then goes to the oil cooler? all pressure is regulated pre-oil filter or post oil cooler?
|
Originally Posted by diabolical1
(Post 7541893)
they're not going back to peripheral exhaust ports. side ports are the present and future. the problem is that mainstream hasn't caught up yet. porting, especially on the exhaust appears to be a bit tricky, but the bottomline is that these side port engines do their job better than the older design. i mean think about it. stockports on these engines are making what it would take streetporting or forced induction to make on the older engines - with the same fuel. i'm sure it's just a matter of time before we all have a bag of tricks for making more power.
13b. but guess what, the rx8 is only making a little over 180rwhp. go to the rx8 forums where they show there actuall dyno numbers and u will see that most of them with mods r only making around 180 to 190rwhp. now u also have to consider that the renesis has lighter rotors with more compression, lighter e-shaft, better intake design, less restrictive exhaust, and all new technology around it. the rx8 barely make any gains with mods. some guy were only making like 5hp off an exhaust. so why would that side exhaust be considered any with hp? older 13b's make more power on a streetport |
All times are GMT -5. The time now is 11:53 AM. |
© 2024 MH Sub I, LLC dba Internet Brands