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Well Richard, Bill and All,
I have to bow my head in shame and confess I one
again believed what I have been told to be true - when in fact it
wasn't.
I guess I can say the RX8 rotor IS lighter, but not by much. It weighs in at 4241
Grams or 9.33lbs. A reduction of a bout 2% from the lighter
89/91rotors.
Again I made an error, the RX8 rotor appears to be
symmetrical in the compression depression. So the chap who runs them backwards
may be OK in doing so.
My advice ( I think I will use this
statement more often) is that the depth of cut for the RX7 is 9.5mm (
appears to be correct) the RX8 appears to be 6.25mm, by my measurements. An
additional 3.25 cut in depth is required for the earlier Apex
seals..
Width of the RX8 Rotor is 79.75mm compared to
an old rotor I have here that's 79.65mm The RX rotor is .1mm bigger (
approx)
Anything else you chaps need - I'm depressed as I
was looking forward to that Rotor weight savings.
George ( down under)
Kelly,
absolutely!
Richard Sohn
N-2071U
----- Original Message -----
Sent: Wednesday, April 13, 2005 6:41
PM
Subject: [FlyRotary] Re: Fw: Rx-8
Rotors useable in 91 13B?
Richard,
But we would include the side seals and
springs ,end seals,springs (and plugs ),
and oil seal rings and respective O-rings ? Is that asumption correct
?
--
Kelly Troyer
Dyke
Delta/13B/RD1C/EC2
--------------
Original message from "richard sohn" <unicorn@gdsys.net>: --------------
George,
I got the information from my engineering education, and also Leon
confirmed it in one of his recent postings on the subject.
One more thing, the difference between the two rotors balancing each
other and needing balance weights anyway, is static balancing vs. dynamic
balancing.
Richard Sohn
N-2071U
----- Original Message -----
Sent: Wednesday, April 13, 2005
5:02 PM
Subject: [FlyRotary] Re: Fw: Rx-8
Rotors useable in 91 13B?
Richard,
This goes against my advice as all components in movement affect
the rotating mass.
It would be like not allowing for rings in a piston in the balance
equation.
However I will check on that aspect. Where did you obtain that
information
George ( down under)
Sent: Wednesday, April 13, 2005
12:02 AM
Subject: [FlyRotary] Re: Fw:
Rx-8 Rotors useable in 91 13B?
Bill,
If you find out before I do will you let me know about the
additional depth to be cut.
On the balancing; I have to cover all that with my one rotor (
no biggie), I can give you all that stuff a little down the track it
will only require lightening the counter balance weights a
little.
The e-shaft is the same, the rotors lighter = lighter balance
weights.
There may be some oil volume difference (read weight) ,
but I should have that soon, as well the rotor weight. BTW Tracy's
apex seals are 33 grams ( per rotor) - got them to-day.
Has anyone got a set of new Mazda apex seals handy to weigh - I
guess there wouldn't be much in it anyway - just curious!
George ( down under)
I am going to
look into this a bit more and find out how much to mill a
rotor. A lighter rotor => more rpms without increasing
stress?
Ed Don't forget lighter rotors would require different
balance weights. I have heard from various sources that the
Renesis rotor was lighter and then that they weigh the same! Both
from usually reliable sources, go figure.
Bill Jepson
George,
the apex seals do not go into the balance equation because
they are not attached to the rotor.
Just my 2c.
Richard Sohn
N-2071U
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