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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