Hey I'm not sure this was posted. If it was sorry. RaceingBeat has put out some lightened rotors.

http://www.racingbeat.com/FRmazda4.htm


Whats the real benefit??

 

Nut Shell ... Turning Weight = Horse Power.

They are doing a comparison on one of the Speed channels of a ford wagon vs a porsche, and they are modding the Waggon. They put new muff and exhaust on it, then added brakes and lost HP...

They are baffled so they go ask some questions and turns out the new brakes are heavier, and cost them 12 HP by the calculations.

EDIT - OOps I mean the Brake ROTORS were heavier. The Turning parts not the Calipers and Pads..

 

...ummmm

 

Hmm....

.2 lbs per rotor, so .4 lbs total. Seems insignificant...

At 9000 RPM thats a total of 3,600 lbs less weight that had to be turned. As a layman, that still seems pretty damn significant to me. Even at 4500 RPMs, thats 1,800 lbs less...30 lbs less each second.

This should see some nice gains, no?

 

The rotors are weight that is turned by the engine, thus causing the engine hp to overcome its resting inertia.

By lightening them you get more power to the wheels.

 

If you get these, since the engine is already out it would be a good time to get the engine ported. Get the most bang for your buck if you're going to haul that thing out.

 

That does not sound right to me. It sounds like how much force it would take to spin that weight instantaneously, which is not what is happening.

Besides, that weight is coming from the internal ribbing and bearing support areas, not the outside rotors which are acting upon a lot more force.

Any one with experience want to tell us the real advantages and not just theoretical?

It sounds to me like it would be similar to a lightened flywheel at best and better able to handle high revs due to balancing and other tricks.

I really do not know though.

 

anyone care to spend 1995.00 and find out the benefits :p

 

Actually my math is incorrect...the rotor is actually rotating once for every 3 turns of the crankshaft...so at 9000 RPM, the rotors are only rotating at 3000 RPM. So those numbers wouldn't be as high.

 

Unless I read their page wrong, it says they are in the development phase of lighter rotors (I assume engine rotors, not brake rotors?) , but it said nothing about them being out yet. Hopefully they will be available with a low-compression version also.

Another question--is there any reason (other than cost) for Mazda to be using cast iron for the "irons" in the renesis? I assume older rotaries are the same, can you get cast aluminum replacements for them? How much weight would that drop?

 

are you talking about where they say:

if so then they are talking about BRAKES! everyone from spazm on down seems to be talking about the rotors in the engine.

 

They have engine rotors.
Go look. 9.2 lbs stock, 9.0lbs for their version.

 

Yeah man these are ENGINE Rotors. I can't link it directly, but you need to look at the stuff they have. It's new

 

wow that is a lot of money for .2 pounds of saving......since i am not racing my daily driven car i think i'll pass.:D


edit: well .4 total savings at .2 per rotor:p
http://www.racingbeat.com/FRmazda4.htm

 

What The Hell? i swear when i went to the first link it went to a page that did not have the rotor pics near the top there. did you change your link? anyway thanks for pointing it out! glad i was incorrect

 

I'd like to hear RotaryGod speak on the subject of light rotors and the gains... Or maybe I missed that speech.

Paging RG

 

hehe i think he may be drinking beer out fo a 13b

 

They are primarily intended for race use. In a race, even a small amount of reduced rotational mass could be the difference between winning and losing. The engine would rev a little faster. The gear is also snap ringed in place. At high rpm's the stock one's could loosen up and destroy the engine by allowing the rotor to move side to side. Don't worry about it on a street car though. These are some good mods to racers but not practical for the street. Also remember that the counterweights are also lightened and balanced accordingly to match.

If anyone else noticed, the site mentions that the intake system is scheduled to be ready mid January. Strangely enough the update says 1/05. I guess he got a little ahead of himself.

They are also working on a single tip race exhaust. The advantage of that I have no clue other than a few pounds weight savings.

 

E-mailed RB -

Ryan,

Lightened rotor sets are typically installed in race-prepped engines where many other modifications have been performed to the engine.I don't recall having ever taking a stock engine, rebuilding it using only race lightened rotors, and running it on the dyno to record the performance increases. The work required to undertake this test is just not practical.

The true benefit of lightening the rotors is a reduction in mass and inertia, and resulting decrease in stress on the engine bearings. Although this may not seem highly important on street driving, on high HP race engines this becomes a serious concern. The reduction in mass with rotors can be compared to a lighter flywheel, the reduced mass will allow the engine to rev more quickly, thereby increasing low end performance.

The snap ring process on the rotors will also prevent the ring gear from "creeping" during sustained high RPM driving found under race conditions. Although the modifications and weight reduction may seem minor, a car equipped with race-prepped rotors will certainly have an advantage over a car that is not so equipped!



Best regards,

Jim Langer
Racing Beat, Inc.
714-779-8677
www.racingbeat.com

Basically just what RG said

 

oooo you really are a god rotartgod..muahaha "rotarygod Location: Houston, Tx." this is now my rx-8 mecha

 

lol

 

It seems as though rotarygod has formed some sort of following....

 

That's just great!

If you go over to the RX-7 forum, I'm damn near the antichrist there! Alot of those guys hate me.

 

BLASPHEMY i shall lead a war upon this heathens muahahahaha may they forever live in a world of pistons and not know the light of the spinning triangle god:D

 

There are quite a few intelligent people and a lot of retarded people who think they are intelligent on RX7club.com. It can be really difficult to cut through the BS sometimes.