"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-- 

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