14000 rpm Rotary ?????
 

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 ?

i personally never heard of a 14k rpm rotary before

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

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

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

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.

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

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

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.

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 :D

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.

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.

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.

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

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

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 :)

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

^ 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.

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

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.

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...

^

Too much Gran Turismo for you my friend

Lmao funny shit...actually the main reason i got into cars n learned about em was in gran turismo on ps1 when i was like 10. Sh1t i donno if thats a good or bad thing.

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

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!]

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. :Kill1:

I wouldn't consider anything vivid says as 'fact.'

From ACPT's website:
How do you like those apples? Don't come into Race Car Tech acting like God after browsing a parts catalog and playing Gran Turismo.

MiKEdaG0D: Dude, chill out. Think about it, how could a drive shaft that isn't directly related to engine speed, but vehicle speed allow the engine to rev higher? RX7s aren't set up like Porsche 944s with the trans. located in the back of the car. The lighter drive shaft would allow you to accelerate faster, sort of like replacing heavy wheels with smaller lighter ones. See what I mean?

Edit: D'OH! Eastcoastbumps beat me to it, lol.

I run my engine to about 12K on my Drag race p-port motor.The assembly has
to be really balance to stay up that high,also the oil system has to be upgraded
to withstand the high volume to the bearings.I have taken my engine apart and
don't see any problems.I encounter bearing problems before but i do really have
to keep an eye on the oil changes .

hahahahah

Wow. What can I say to that?

As was pointed out, the claims on the website are BS, because this shaft is not being used between an engine and transaxle, but rather between a tranny an diff. Big difference.

Too many off those performance shops are and their web pages are complete BS, as has been shown over and over again by people who actually race. A healthy dose of skepticism is in order whenever you start reading these claims. Put the brain in gear and think about what they are saying.

As for the language - let's just try and act like adults here.

-b

i think we should have an intervention with that individual who mentioned the super cool driveshaft and suggest some anger management. Breath in......breath out......repeat. MIKEdaGOD takes his name to seriously. We all know that you have to do just a little (drastic sracasm) more than a fancy driveshaft. That alone is one of those things that is so rediculous is hurts my brain to think about someone who actually thinks that.

And let us remember, just because it is on a website doesn't mean anything. If everyone told the truth about a product they were trying to sell then that would be a different story. Newsflash Mike.....the internet is not a reliable source. I bet he believes all those email about how to make his weiner bigger too.

How many "credits" is that "mod" in Gran Truismo anyway?

Ok I'll be a man and say im sorry for the tiitty attack, but you gotta understand where i was comin from. I didn't know the fact about the driveshaft being between the transmition and diff and was just goin on from the information i was given. I apoligize for the temper and the language but at the time it did get me hot that you came at me like that like I made the product and didnt even look at the website either. I would of been nicer if someone would of claimed the website as bs and not single me out like i made the sh1t. I will admit I'm still in the process of learning about these cars myself and my fault for taking your knowledge for granted. Maybe i should do a little thinkin before i speak myslef eh? I'm not here backin down from my comment earlier and don't get it twisted, I'm just being a man about things a admitting i was wrong. But agian my fault for the childness but again you gotta understand where i was comin from and yes your right, lets act like adults here. Stay up, stay strong, and most of all be easy

And for the comment above and those other smart @$$ people.....Ill just be easy and keep it movin. I think ive learned that it aint worth it already.

You were singled out because their comments were in direct response to one of your own.

You also dictated the tone of others' responses with your:

In your own words: dumb @ss.

Crap like this only seems to happen every few months in here. Let's keep it that way. Thanks guys.

No harm no foul. It takes a mighty big man to appologize, especially over a website since all the anonymity involved. No one on this website knows everything, but there are some who are pretty damn close, most have forgotten more than I will ever know about these devils.

To get that kind of revs, you need to start with the engine and make sure it can acheive/handle that before you go for the trick exotic carbon goodies. IMHO they are the final componants and won't do a whole lot in the actual increase of rpms, just how much faster you get up there, I would have to imagine that is a substantial rotating mass reduction.

Anywho....all is forgiven. It is a vary admirable trait to be able to admit fault and will get you far in life, but it's best if you dont put yourself in that postion in the first place.

Rock out Mike....

Appreciate it bro and good looking out on the info about the whole situation. Be easy yo and ya i guess i should of acted like that in the first place....
:wallbash: