----- Original Message -----
Sent: Saturday, February 25, 2006 10:09
PM
Subject: [FlyRotary] Re: Hi Chuck
[FlyRotary] Rotor identification
Thanks Ed, that is just what I was looking for. Those masurements prove
that one is a 9.7 and one is a 9.4, just as Kelly surmised from the
photo.
Fortunately I have another rotor that matches the 9.4 so I still have a
good pair.
I
will check the apex slots as soon as I get them cleaned up. It will be at
least another week before I can get the bad motor home and torn apart, I will
sure post the results as soon as I can.
Chuck
Hi Chuck
Here is what I found about some of the different
compression rotors. If you lay a straight edge across the depression
longwise and measure from the bottom of the straight edge to the deepest
part of the depression this what I have found: for
the 9.7:1 the depth is 4mm, for the 9.4:1 it is 5.5mm and the 9.1 is 7
mm. I have nothing to determine their weight other than the
compression/weight correlation.
Also, I would carefully check the apex seal slots,
they can be worn on used rotors and that is what I am convinced caused my
apex seal to break. They become "v" at the top and no longer provide
the wall support for the top of the seal, the center of the seal tends to
break and leave the slot causing other damage.
Lynn Hanover provided this quick check.
If you stick the end of an apex seal length wise into the slot
(keeping it vertical) and move it from side to side so that it touches first
one side of the slot and then the other, the far end of the seal should move
in an arc of no more than 3/16" of an inch - if it move more than that the
slots have "V" passed specifications.
When you get the time, we all would like to hear what
you found and what you believe the cause.
Ed
----- Original Message -----
Sent: Saturday, February 25, 2006
6:48 PM
Subject: [FlyRotary] Rotor
identification
I bought this
pair of used rotors to build up a new motor so I can retrieve my RV-6.
They look different in the compression chamber "tub" area, otherwise they
look identical. They both are marked "D" for the weight code. Can
anyone identify these and verify if they are OK to use ? I am thinking if
the compression ratio is different, it may run rough even if
they weigh the same. I remember Ed posting something about a way to
measure the depth, but I cannot find it in my sea of saved
emails.
Chuck
Dunlap
N616RV
13B
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