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Message
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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