NativeBeggars

iTrader: (1)

Greeting First-Genners! Recently, I helped a friend of mine clean out his hangar of old rotary parts, and I will have to tear down the motor he has in his airplane as he has mismatched stat gears and mismatched rotors, so I will have more parts soon. This guy is a bit senile, and doesn't exactly seem to know what he was doing with the parts. The eshafts I have, he painted, to keep them from rusting, so they're probably boat anchors now, and I have some more questionable parts, but without a working caliper any more and a set of feeler gauges that were stolen from me, it will be difficult to get some real solid measurements.
I have a lot of older parts; eshafts, irons, housings, counterweights, stat gears, a set of new oil control rings, etc. Half of my parts are S4, which is alright, but the other half is all 12A I believe, because I don't know what I'm looking at. All the orange parts are the older ones. The newer irons are from an S4 I believe. I just want to know if there are some guys out there that can help me find out what all these parts are for, what they can go to, and if anybody wants to buy them from me. I will post a thread in Classifieds if I get some interest here. I have two whole engines almost, aside from the other pair of mismatched rotors and the other counterweights. I have all the thru-bolts and dowel pins for one motor, and honestly not many small parts. I'm trying to fund my Stella build and move out, so anybody willing to help out would be greatly appreciated!
In this set of photos area pair of rather nice-looking "Aviation Division" rotor housings which are a bit strange, and have odd bolts into the exhaust passages.
To avoid cluttering the thread, I will post a link to my photobucket album of these parts;
statgears1_zps09953f69.jpg Photo by NativeBeggars | Photobucket
You will start at the beginning. All of the photos have descriptions.
If there is anything in particular you would like to see, please don't hesitate to PM me. These things don't do me much good since I usually work with FD housings and rotors and S4/S5 irons.

peejay

Those rotors "milled for 3mm seals"... measure the side seal slots. If they are 1mm, those rotors weren't milled by anybody but Mazda.

j9fd3s

iTrader: (3)

+1 he's obviously got an S4 na and 74-75 13B, so between those engines, the stat gears are the same, but the rotors, housings and irons are different.

if those rotors are the S4, they should be about 9lbs, the 74-85 13B rotors are 12, and like PJ says, have 1mm side seals and 3mm apex seals standard

NativeBeggars

iTrader: (1)

Thanks for the input, fellas. I found out the bit about the seal clearances after I posted this with further reading, turning up 1mm all around, and after weighing them in at 11.6lbs a piece, I can conclude that the rotors I have are indeed 74-75 13B. Just one is B weight and one is C for sure by the markings and divots.
I did get another set of rotors today as well, which I can upload some pictures of for reference. Much cleaner, they have 2mm apex grooves and 1mm sides, The compression pockets are cast a little differently, and they weigh 10.0lbs each. There are "D" and "E" markings on one and "E" and "E" markings on the other. They both are numbered 1, 3, 5 around the stat gear side and 2, 4, 6 around the oil side. It looks as if they have three oil control ring grooves on each side.
You guys want pics of these too?

Also, does anybody know about those "Aviation Division" housings? What's up with that?

NativeBeggars

iTrader: (1)

What kinds of things do I need to check iron tolerances, and how might one do it effectively?

NCross

iTrader: (18)

Interesting stuff.

NativeBeggars

iTrader: (1)

All of these parts are being posted in our Classifieds, the ones on NoPistons, and on the SE List of Craig here in the next hour. I have more pictures of some more parts too, so I will be adding some new stuff to that album.

NOTE - THE '74-'76 C WEIGHT ROTOR WAS KNOCKED OFF MY WORKBENCH [by my fumbling-drunk and angry little brother last night] AND MADE A PAPERWEIGHT. I'll sell it to you if you really want it for something, but if it doesn't sell I'm just going to scrap it.