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Message
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.
Hi Chuck,
As you probably know, the
rotors you use must also match the counterweights that you have. What
year, and CR rotors do you have in the current
engine?
Overall weight of the rotors
will tell the tale for counterweights, and will also narrow down the CR
identification to only two choices per rotor weight. Attached is
the weight and CR chart that I "borrowed" from Mazdatrix's
site.
Do you have the old engine at home, or are
you planning to build a new engine, then swap them in one trip?
Good
luck.
Rusty (8 days RV-8 construction,
finishing empennage kit
tomorrow)
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Rotor Weight/Compression Chart
Rotor Weight and Compression
Chart
This chart is included in our Website and Catalog for reference
purposes. The weights listed are for production, unmodified rotors.
| Engine |
Year |
Compression |
Weight (Grams) |
Weight (Pounds) |
| 12A |
76-82 |
9.4 |
4603 |
10.15 |
| 12A |
83-85 |
9.4 |
4353 |
9.60 |
| 13B |
74-78 |
9.2 |
5253 |
11.58 |
| 13B |
84-85 |
9.4 |
5253 |
11.58 |
| 13B N/T |
86-88 |
9.4 |
4553 |
10.04 |
| 13B Turbo |
86-88 |
8.5 |
4553 |
10.04 |
| 13B N/T |
89-92 |
9.7 |
4328 |
9.54 |
| 13B Turbo |
89-92 |
9.0 |
4328 |
9.54 |
| 13B T/T |
93-95 |
9.0 |
4328 |
9.54 |
NOTE: Weights are approximate, and include rotor bearing, but do not
include any seals or springs.
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