rotorooter93fd

iTrader: (6)

I've been up all night trying to get my house ready for family coming in town, so bare with me maybe im just going nuts. I started thinking about the breaking point of the E shaft, I hear about everyone trying to make a stronger shaft but I started thinking. Maybe if we put less stress on the shaft by using a lighter rotors it wouldnt break as easily. This and a combination of the other modifications we are aware of might help. Also maybe another motor mount on the front of motor might help to keep the rotating assembly more stable by keeping the motor more firmly planted. scratch:

j9fd3s

iTrader: (3)

i agree, breaking the shaft is a symptom

ReZ311

iTrader: (4)

Titanium rotors.

rx jamie

titanium rotors would never work, titanium is really soft when exposed to high heat.

we had ti pipe work on our plant at work and above 400 degrees the pipework was prone to rupture. i nthe end we exchanged it all for hastelloy

hwnd

iTrader: (4)

HA! you might be shocked with what some deep pockets came up with.

an interesting tidbit i read:
so it starting to fall apart around 400c/800f means it wont work for us internally.

CrackHeadMel

iTrader: (2)

that must have been a fun one to get approved.

TAZ-NZ

Beryllium-Aluminum Alloy is basically the perfect material for making rotors.

Commonly used in the aerospace industry, it's lighter than Aluminum, high strength, and has great thermal stability.

Problem is it's extremely expensive, $600 per pound, complex to machine, and the dust given off during machining is highly toxic, but once installed in an engine would pose no more harm then anything else coming out your exhaust.

cptpain

iTrader: (1)

Ouch..... $600x9.5(give or take a few 10ths) = $5700 per rotor!!

Turbo II Rotor

iTrader: (2)

^ Those are some heavy "lighter than aluminum" rotors.

ReZ311

iTrader: (4)

Titanium is a great metal to use. Here's the trick. Plasma spray the Ti rotors with Cubic Zirconia.

http://en.wikipedia.org/wiki/Cubic_zirconia

http://www.insaco.com/MatPages/mat_display.asp?M=CZ

Light, Strong, Heat Resistant.

TAZ-NZ

The rotors wouldn't be that heavy, it's easy enough to work out with a bit of ruff maths:
Steel has a density of about 0.28 lb/cu
Beryllium Aluminum Alloy has a density of 0.076 lb/cu
Stock steel rotors weigh 9.5 lb.

9.5 / 0.28 = 33.93 (volume of a stock rotor in cubic inchs)
33.93 * 0.076 = 2.58 lb (now that presuming there is no change in the rotor design)
2.58 x 600 = $1548 per rotor (and that don't allow for manufacturing, waste etc).

Like I said extremely expensive, but the rotors would be less than a third the weigh of the stock items.

vincentrx7

iTrader: (2)

Sent the shaft to Liberty Transmissions and have them do there metal enhancement process. They have a 3 step process of shot peening, Heat stress relieving and cryo treatment. That would be an economical, incremental help.

rotorooter93fd

iTrader: (6)

does anyone think that maybe just using lighter rotors would be a good route to go(if possible) and anchoring the motor with a 3rd mount up front at the front cover or iron?

ReZ311

iTrader: (4)

Something like this?
http://racingbeat.com/resultset.asp?PartNumber=10004

GSLSE-YA

what about a titanium E shaft with Lightened rotors? What kind of heat is the E shaft exposed to?

I like the sound of the 2.58lb rotors. $3500 for a pair of ultra light rotors would be worth it, especially if it increased reliability and hp. Tight tollerances and low weight.....

rotorooter93fd

iTrader: (6)

exactly like that

TAZ-NZ

Titanium is an unsuitable material to make a eccentric shaft out of, titanium is about half as stiff as steel, so an eccentric shaft bad out of titanium would flex to much to be usable.

The best material to make an eccentric shaft from is chromoly steel, as it's extremely stiff yet strong, I not sure what the factory items are made from but I know a couple of the aftermarket eccentric shafts are made from chomoly.

GSLSE-YA

so how about this:

1. chromoly steel e-shaft,

2. Beryllium-Aluminum Alloy rotors,

3. 13B PP combined with side bridge ports (we can call it the super duper port) JK

4. we need a NA 13B with 450+ engine hp

Rx7Turbologic

did anyone built this thing?

Turblown

iTrader: (12)

http://www.eastcoastparts.com/html/billet_rotor.html

Rx7Turbologic

Where is the oil passage in the rotors for oil cooling. If this thing is made out of block aluminum, then it must be as heavy as the original iron rotor... and probably heavier too.

quattro4now

I wish they mentioned how much it weighed. I'd rather have it hard anodized instead of a machined surface finish though.

ReZ311

iTrader: (4)

It's probably not heavier. They probably plasma coated the rotor to be heat resistant, so no need for oil cooling.

quattro4now

It should still have some oil cooling though if its meant to be used on the street. Heat resistant isn't the same as heat proof. Heat resistant just means it takes longer for heat soak to take effect. If its thermal coated it could get by with a lot less but it still needs something to carry heat it abosrbs away.

ReZ311

iTrader: (4)

Understood, the bearings get cooling, which probably is sufficient enough. Aluminum is an excellent heat transfer metal. Somehow they have 600 miles on their billet aluminum rotors. Maybe the do have cooling passages... They post little info about it, let alone the weight...