> > > > > > >>"Brian D. Cain" wrote:

 > > > > > >>
 > > > > > >>
 > > > > > >>>An 86 Non-turbo rotor?  I believe they're the same
 > as the 87
 > > > > > >>>and 88
 > > > ones,
 > > > > > >>>correct?  9.4:1 compression?  I'll see what I can do today.
 > > > > > >>>What
 > > > weight
 > > > > > >>>code
 > > > > > >>>range do you need?
 > > > > > >>>
 > > > > > >>>B
 > > > > > >>>
 > > > > > >>>Brian D. Cain -/- Grand Prairie, TX -/- bdc196@comcast.com
 > >
 > > > > > This  note is for Brian Cain.
 > > > > > Hey Brian you made a comment above about a weight code for the
 > > > > > rotor. This sounds like a perfect opportunity to
 > expound upon our
 > > > > > ever increasing knowledge of Rotary. What weight code were you
 > > > > > refering to? Is there any markings on our engines that show a
 > > > > > weight code? I am particularly interested because it
 > would make an
 > >
 > > > > > inference to matching rotors for building engines
 > from parts. Can
 > > > > > you enlighten us? Doug Mueller 13BT RX-6
 > > > > > N900DM
 > > > > > Henderson,NV
 > >
 > > "Brian D. Cain" wrote:
 > > >
 > > > Hey Doug,
 > > >
 > > > There's a weight code, to five varying degrees labeled
 > "A" through "E"
 > >
 > > > (where weight code "A" is the heaviest), stamped to every rotor on
 > > > their gear side I believe.  They're difficult to see on a
 > dirty rotor,
 > >
 > > > but once you give it the spit 'n polish treatment,
 > they're plain as
 > > > day to see. According
 > > > to the factory shop manual, when assembling an engine, the weight
 > > codes
 > > > must be referenced.  The rule of thumb is you cannot use a pair of
 > > rotors
 > > > where the weight codes are two weights out:  For example,
 > if you have
 > > a
 > > > "B" weighted rotor, and then your rotary engine buddy
 > down the street
 > > > gives you a "D" weighted rotor, they're not supposed to be mated.
 > > But,
 > > > if he notices he has either an "A" or a "C" weighted rotor, then
 > > either of
 > > > those can be used.  I'm not sure of the difference in
 > weight between
 > > "A"
 > > > through "E" but I believe it's within grams of one another.
 > > >
 > > > The factory rotating assembly is quite well balanced from
 > the factory.
 > >
 > > > Aside from the issue of the eccentric shaft not having a centre
 > > > support to ride on, the engine can be spun very high up from the
 > > > factory (8500+rpm). In any event, make sure you use a weight code
 > > > that's atleast within one letter difference, if not the same.
 > > >
 > > > http://bdc.cyberosity.com/pictures/MarioTrevino/EngineRotors1.Jpg
 > > >
 > > > B
 > > >
 > > > Brian D. Cain -/- Grand Prairie, TX -/- bdc196@comcast.com MSN
 > > > bdc196@hotmail.com, Yahoo! bdc196, AOL Symajhi, ICQ# 1733105
 > > > http://bdc.genxracing.com http://groups.yahoo.com/group/fc3s_org
 > > > http://groups.yahoo.com/group/HaltechSupport--
 >
 >
 > > That is very good to know, Brian, I never heard of that
 > before. If its
 > > in my shop manual I must have missed it. The four rotors I
 > have are all
 > > stamped "D". If I had to buy a new rotor from Mazdatrix I
 > wonder what
 > > weight they would provide.
 > >
 > > Chuck Dunlap

 Chuck,
 I just opened the box to the rotor that I was going to send you -
the rotor is weight code 'C'.  Do you want this one or do you want
to find a 'D' code rotor?

 Ken Powell

   I have talked to Rob Golden about this and he said that for our rpm
range that one notch off is all right.
  Also he said that you can match balance them by drilling equal depth
holes on all three points and just weight them on a scale and it
would be fine without spin balancing them at our rpm range.

  Ken Welter

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.