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Chuck,
Using visual clues only the rotor on the left appears to be a 86-88
(9.4-1 compression) because of the "As Cast" depression if from
a NA engine........
The rotor on the right appears to be a 89-91 (9.7-1 compression)
because of the "Milled" depression again if from a NA engine........
There is another potential problem and that is where Ed's depth
measurements come in.......All of these model years also had turbo
versions available that have compression ratios from 8.5-1(86-87)
to 9.0-1 (89-91)........All of the same model year rotors are the same
weight (NA or Turbo) but the 89-91 are lighter and you cannot mix
them (Well you can it will not be a good idea !!)
Now we need to hear from Ed with the depth measurments!! FWIW
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2
-------------- Original message from "Chuck Dunlap" <crayd@cableone.net>: --------------
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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