damaged-g00ds

Umm i was just wondering what do those guys do that have like 14000 rpm capable rotaries, what is the process behind high revving rotaries, i dunno if 14000 is abit high but those are the stories i have heard, so how do you do it ?

eoph

i personally never heard of a 14k rpm rotary before

bond007

Balance the rotating assemblies plus some internal motor modifications.

SCCA production class rotary motors are built to spin quite high.

The motor will also wear out quicker, so you'll need to put it on a rebuild schedule.

--Ashraf

damaged-g00ds

that sounds awesome hehe and what kind of power increase can one expect from a mod like this ?

eoph

if u want more power you're better off using force induction, it'll be cheaper

MPM

The engine in the MazdaTrix EP car was built to the max and only saw 10000rpm on the engine test stand. Dave usually keeps it around the 9500rpm for shifting so the engine will last most of the season. The engines ability to spin to 10000rpm is usful incase Dave miss's a shift or wants to hold a gear just a second longer. He has posted on here before with the basic specs of his engine and actually commented on how he felt near an engine spinning 10000rpm. You would also have to find a flywheel and cluthch assembly that would take that kind of rpm(14000). I'm not saying its not out there but in the 12 years I've been messing with and reading about rotaries I've never seen or heard of one that was capable of what you want.

tims

in the US there is just no where to race this type of engine, so you are not likely to see this setup. but there are some Aussies that road race 13b's that shift in the 12000 rpm range. the porting, the bearings, oil system, flywheel, even a two piece e shaft witha center support bearing is used to get the HP and rpm numbers. but in the US thereis no where to race an engine of this type. in Australia they have a few race series that allow the rotaries to do some different things, so the guys down there have developed some new parts that you just don't see in the states very often. check out the guys from Guru motorsports. they have also posted here on occasion

Carl Byck

Take a look at AJC13Bs dynos, well above 10,000 I believe.

Project84

It cost an extraordinary amount of money to build a motor to do 14,000 RPM safely, consistently, and to make it last for any legnth of time like a racing season.

damaged-g00ds

yeah ok maybe i blew it out of proportion a bit hehe 14000 rpm i suppose does sound a bit high, but now u know what i mean by HIGH revving rpms what is standard for an fd ? 10000 is still pretty high though, just imagine the power with 10000rpms and forced induction hehe

851stgen12a

at anywere above 12grand it becomes very dificult to keep oil were it needs to be. And anywere above 9500 and motors start t wear out VERY quickly.

tims

the great thing about forced induction is you don't need to rev the engine. larger turbo=more power with FI, more revs can = more power for a NA. want more power for your turbo car, install new larger turbo, no need to rev the engine anywhere near 10,000 rpm.

coldy13

My old neighbor used to be on a race team that ran a RX-7. It was a red FB, 12a P-Port engine, weber 48 carb, making around 280-300hp. It made it's peak power around 12,000rpm. I wish I had more information on thier car, and what class is ran in, but he moved out before I really got into RX-7's.

specRX7_22

i know a guy who hit well over 14,000 rpms............ by accident

(redine 4th gear in a streetport motor, like 10k rpm... went to hit 5th, grabbed third.....yeah)

DamonB

I personally know of a first gen running in SCCA Solo II FP that sees 12,000 rpm plus regularly. Motor built by Don Marvel in Rowlett, Texas. I won't reveal anymore than that out of politeness for a friend who has spent a lot of time and money developing it, but I do know his clutch is only 6" in diameter and the flywheel is custom

Prometheus

iTrader: (2)

could you possible lighten the rotor itself by milling it out to both lighten it and increase the combustion chamber?

Tanjo

^ and lower the compression. Kinda defeats the purpose. I knew a guy that had a clutch/flywheel combo lying around, the clutch itself was a triple plate, but only like 5 or so inches in diameter, and with 4 spokes that connected it to a ring gear, and you could take all that off if you had a starter for the front pulley. Think of a motor with NO flywheel. An RB aluminum weighs 12 pounds. Imagine taking 12 pounds of rotating mass away. Thats like taking a rotor out.

12akid

i have a friend with a brigde ported motor 680cc gslse injectors and flywheel, with a 150shot doing 10000rpms think he said he was at 215rwhp allmotor , rx8 does 9500rpms stock

speedturn

iTrader: (1)

I have been road racing PP motors for a decade now. They can turn high rpms, but it is in an over-rev situation; revs over 10,000 rpm are usually past peak power. The over-rev ability is useful to be able to stay in the same gear when a corner is coming up, instead of having to upshift to a higher gear for just a few yards and then have to downshift again for the corner. The over-rev ability can also be useful when a low buck team is forced to use a wide ratio street transmission with a PP motor, because the street tranny will drop so many rpms every gear shift.

MiKEdaG0D

heres one way you could add a lil rev into your motor..donno if its safe or not but ill post something when i buy it myself. Its a lighter driveshaft made from carbon fiber, which could be purchased at vividracing.com. It doesnt twist or what not what other driveshafts have a tendency of doin and is suppose to raise the limit buy 500 - 1000 rpms. They also got a 6 speed transmition for sale and a carbin lsd. Cant wait til i got enough for those, but i guess i gotta work on gettin a fd in the first place...

dradon03

iTrader: (2)

^

Too much Gran Turismo for you my friend

MiKEdaG0D

Lmao funny ****...actually the main reason i got into cars n learned about em was in gran turismo on ps1 when i was like 10. **** i donno if thats a good or bad thing.

That Rx-7 kid

My dad's friend supposedly owned an fb that spun to 14,000k rpm. I don't have much info on it though.

wrankin

Must... not... reply.... must resist.....

Ahh what the heck.

Riddle me this, Batman: how does a drive shaft, that is on the back end of the tranny and turns only as fast is the car is moving (regardless of how fast the engine is spinning) increase the ability of the engine to rev?

Does it reprogram the ECU to raise the fuel cut point?

Must be a heck of a driveshaft to do that.

-bill "too much GT indeed" rankin

[edit: ohmygawd, this is a four year old thread... and I replied to it! bad bill!! no biscuit!]

MiKEdaG0D

Yo don't come at a n166a sideways until u've read the facts. Look on the m0ther fuqin web site yourself then come say some bullshit so i could prove your dumb @ss wrong. If you think what im saying aint fact look on the website first. This is directly from vividracing.com dumb @ss m0tha fuqa

ACPT Carbon Fiber Driveshaft Mazda RX7 93-97
Model: AA-30AW-31-33.875 List: $927.99
ACPT Carbon Fiber Driveshaft Mazda RX7 93-97
Click to Enlarge

ACPT Carbon Fiber Driveshaft Mazda RX7 93-97

ACPT has developed a carbon fiber driveshaft that allows a 1000 RPM increase in the engine speed and gives the engine a chance to work at its� power peak. Its track tested at well over 800 horsepower. Its a stronger,lighter, direct replacement for your stock aluminum driveshaft. Which are known to twist.

You can achieve rear wheel horsepower gains of more than 5% with the simple switch to an ACPT carbon fiber driveshaft. Carbon fiber offers you more strength to resist extreme torque than steel with about half the weight. Just like the common use of the lightweight clutch and flywheel units, a lightweight driveshaft allows more of your engine�s power to be applied to the ground during acceleration.

In addition to minimizing rotational power losses, carbon fiber�s unique vibration dampening characteristics also help improve power output.

Additional Images:
ACPT Carbon Fiber Driveshaft Mazda RX7 93-97
Click to Enlarge

Try thinking before you speak n get some facts on a particular item before you speak some bullsh1t about it. I listed the website for one reason...which was to look at it for yourself if you had any fuqin common sense. Now take that sideways @ss bullsh1t and say it to someone else that aint ganna stand up for what they sayin. Cuz trust me when i tell you...you DON't wanna flex on me. I try to be nice as i can be on the regular cuz its the right thing to do, but don't get it twisted fool, like everyone else i got some wrong in me too.