Linguo415

iTrader: (1)

Is there a shop besides mazdatrix that sells rotors? They only have "C" rotors and they are $700 a piece. From the factory though. I would like to find a pair of "A" Rotors for my build in april. Help please.

i may have to replace one but im not sure since i still have compression of 30psi for 2 faces in the back rotor wich is the one that is blown. One face still reads 90psi. Poor man test.

RotaryEvolution

iTrader: (30)

who is telling you that A rotors are better than C rotors?

that's 1 ounce of weight savings per rotor...(or 1/16th of a pound in simplified US standard terms) so long as the rotors are within 1 rotor letter of each other you are fine.

A rotors are very difficult to find, i don't even recall the last time i even saw one. C and D are the most common weight.

better yet, save that $1400 and buy some used rotors in good shape and have them lightened and balanced for around the same price.

Linguo415

iTrader: (1)

A rotors are liter already. But who does what you are talking about?

j9fd3s

iTrader: (3)

1. ALL of the replacement rotors are C stamped.

2. the rotors were graded by BATCH. do you really think a rotor from 1986 is going to be the same weight as a rotor from 2010? even if it has the same letter

3. do you really think 2 new "random" rotors are going to match with your counterweights?

if you're really that worried about it have it balanced, its not expensive

RotaryEvolution

iTrader: (30)

just about any industrial CNC machine shop can handle it, cost would be around $200-350 per rotor for the initial setup.

these guys are already setup to do it, so does racing beat but i don't see the service anymore, just already milled new rotors:
http://www.rotaryengine.com/services/rotorligh.htm

then the whole assembly would have to be sent out together to be balanced as a set which again costs about $300ish.

not sure i follow you, yes i do think that they would be the same weight after 20 years and their weighting process determines their letter categorical stamp. otherwise you have rotors that are far out of weight from one another on a seesaw, one will obviously try to throw the other off. as far as my reasoning is concerned the rotors are suggested to be required to be within 50grams of one another in total weight which is how they were stamped by milling material off the rotors in sequence to balance them properly. more material needs to be taken off some rotors to balance them first, which designates their stamp category.

i think of each rotor as a wheel on a wheel balancer first, the rotor needs to be balanced by adding or removing weight on each of the 6 tips(all they can realistically do is remove material though), this throws the weight of each rotor off obviously one more than the next, so grading by batch doesn't make sense to me because the rotors from one batch are obviously all going to be different weights anyways.

know what i mean?

i can only guess that mazda just releases the rotors in large batches with one series of stamping to keep all things equal. throwing 3 metric tons of rotors into a box without sorting there can possibly be far more E rotors than B rotors which can cause irregularities with necessity from the market.

mazdatrix is kind of a poor example of this though, in part because they bought out mazda warehouse NOS materials many many years ago. the warehouse may have only had "C" stamped rotors at the time so that is all that they have ever carried. that is why you can find many items at mazdatrix that you simply can't get new anymore from the dealerships.