> > Folks I would like to offer this info because it is important. The
> flexplate
> > necessary comes out of an 86-88 13B NA. It has the wings on it as
> discribed on
> > the previous email pictures.
> > The counter wieght can be interchangeable with other engine types of
older
> > models or turbo versions of the motor ie. 13B Turbo. but you must heed
the
> > differnet weights in the rotors. In order to facilitate Tracy's
redrive
> you will
> > need to first identify what motor you have with the compression ratio.
> That will
> > tell you approx. weight of rotors. Then you will need to order a
> counterweight
> > for your engine not for the flexplate. This will keep your balance. If
you
> find
> > a counterweight at the junk yard you will need to take the whole
assembly
> and
> > have it balanced. The parts needed to balance will be the
> e-shaft,rotors,and fwd
> > and rear counterweights. For an even better balance job you will send
in
> the
> > front hub and the flexplate to. Pineapple racing will balance it all
for
> you as
> > well as Hayes Rotary. The job costs about $450 to do it but it is
worth
> it. I
> > would recommend anyplace else over Hayes as I had great difficulty
with
> turn
> > around time with them.
> > Intersting note is that even two identical engines will have different
> weight
> > counterweight weights. Mazda Fasctory racing balances to within a gram
but
> they
> > have told me that several grams difference between rotors and
> counterweights are
> > common.
> >
> > I hope this helps. This is an old topic that was discussed about 3
years
> ago in
> > the archives. If you want more info on it. I did a lot of research on
> this.
> > Respectfully,
> > Doug Mueller
> > RX-6 13BT
> > N900DM
> > Boulder City, Nevada
>
> Doug,
> Good information and advice, there are some things I don't totally agree
> with however.
>
> Firstly I doubt that Hayes Rotary balance to a gram - if they do that
would
> be wonderful, but having tried to do that, I fully understand the
problems
> associated.
>
> Firstly it's not just the weight of the rotor which is in question but
also
> the weight of the oil in the rotor. As there are many different rotors,
> their cavities ( see oil volume = weight) vary accordingly.
>
> Then do they measure the cavity (oil weight) statically or dynamically.
> A great deal of difference can be seen using the different methods.
>
> Do they use oil or water or soluble oil ( machine coolant -oil in water)
and
> what conversation ratio do they use.
>
> Did you ever measure a gram of water oil or coolant ?- it ain't much!
>
> I figure if they got within an ounce there doing well - but a gram, I
doubt
> it!
>
> Then there the argument about what parts are included in the balancing
and
> how (and where) the parts are held in place when balanced.
>
> Then there's the different balancing machines and which is best for the
> purpose in relation to rotaries. Generally agreed the belt type is best
for
> rotaries
> .
> I figure I can get to within half an ounce, but never a gram. I figure
just
> to wet the inside of the rotor would take an ounce or more.
>
> If they don't take everyone of these variations into consideration their
> just BS .ing. However it does sound good to the un-initiated!
>
> BTW 1 ounce = 28.3495231 Grams.
>
> George ( down under- working hard on my single rotor)
>
>
Hi George,
Balancing weights of rotors are done dry not wet. Mazda Factory balances
rotors to within 4 grams of each rotor. Balancing is done with the e shaft
turned at 2000 rpm. Dennis Hayes and I talked at length about the process.
I
believe him as he is very knowledgeable but Hayes does not do balancing
either. They farm out the balancing as that is how I found out about it.
They
lost my parts and it took four months to get the ones they did not loose.
I
was very impressed by Dennis on the phone the first couple conversations
but after doing business with empty promises, I can not recommend any of
my fellow rotorheads to use their services. I wish Dennis would go back to
trying to be small. Their work ethic would drastically improve. I hope you
read
this Dennis. Anyway I will gladly share anymore info I have with anyone.
Doug Mueller
RX-6 13BT
N900DM
Boulder City, NV
Doug,
I don't wish to get you offside here, but I think you misunderstood my
message.
TRUE rotors are balanced dry when balancing the rotor within itself and this
should be a separate step before balancing the whole assembly, 4 grams is
easily attainable in this particular process as there are no fluids
involved.
HOWEVER the assembly MUST be balanced including the oil weight that the
rotor holds, as this is the additional weight ( with other things) which
represents the total rotor weight. IT is terribly important that you
understand this aspect when talking about balancing a rotary engine, OK!
George ( down under)
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