rotaryrocket79

hey everybody



So what's the deal with these things? Do they completely replace the metal oil rings, or do they between the spring and the old metal one? Or should I just spend the $200 on new metal o rings? Sorry, but I'm a little confused on this subject.



Oh yeah, forgot to add-

I'm rebuilding my 79 12a engine with 130,000 miles on it. Currently, I have the Atkins Rotary rotor rebuild kit, which contains:

8 viton o rings

apex seals and springs

corner seals and springs (thinking of getting 93-95 springs instead)

side seal springs

front and rear main seal

pilot bearing and seal





What else do you guys recomend? This is my first actual rebuild, but I did take apart a junk 12A a little while ago, so I have some idea of what to expect. I just gotta be more careful this time



thanks

fc3sboy1

the viton rings go into and around the metal oil control rings depending on wich one you are looking at (big or small ring) and as far as the deal with them the vitons hold up much better to heat as well as alcohal fuels and some oils and a plus is there less expencive depending on where you get them.

rotaryrocket79

ok thanks



so the smaller of the two go in place of the spring? eh, i'll just get the rebuild DVD



btw, what is "viton" anyway? some sort of rubber hybred?

Lynn E. Hanover

Viton, like all of the materials developed by IE Dupont (Note the two nonsense words stuck together to form the product name) Nylon, Teflon, Delrin, ETC.



A seal made for high temps.



These two seals, seal the oil scraper rings to the rotor. The scraper rings keep the oil passing through the rotor falling into the center drainback hole (in the center iron) and prevent it from getting involved in the combustion process. If both "O" rings on one side of a rotor fail, the engine will smoke like crazy.



Each oil scraper ring has one of these seals in it. The seals ar not substitutes for the scraper rings.



Lynn E. Hanover

GMON

Am I the only one that noticed that the Viton o-rings fit like absolute ****.



They also dont seem to be very "springy" once you do get them installed becuse they are binding so bad.



How can something that is that out of spec be a good thing?

BeaterRX7

I have a 12A I'm building out of all my worst parts. It's my first rotary engine build, so I figured I'd do it cheap. Instead of ordering a set of metric viton oil seals from Atkins, I went to the local o-ring supply store with the oil control rings and asked for standard o-rings to fit. One of the rings fit funky, the other wouldn't fit. I ended up using the funky o-rings and ordered the others in metric. Altogether the oil control o-rings cost me about $30, but if I were building an engine that I wanted to last (hell, I'm using a chipped rotor, 6.5mm apex seals and a housing missing a 6"x1" section of chrome) I'd go with Atkin's set. Right now I'm under $50 in the motor and all I need to do is finish bolting the front cover and flywheel on and mount it in something.

Lynn E. Hanover

I have lost one set of stock "O" rings since 1980. And that time was my fault. Used rings from a junk engine that I know had been overheated. And they lasted two seasons before they gave up.

What's wrong with stock rings?





Lynn E. Hanover

banzaitoyota

Nothing

j9fd3s

only time ive had a problem with those is when the engine is super old guy, 211,000miles, engine looked brand new on the inside too

Hyper4mance2k

Theproblem with the Atkins Viton seals is that they are measured in American, and Mazda uses a Metric measurement for the seals. So yes they fit like ****. the outer one is too small and is easy to cut when putting it on and the inner ones are too big and bunch in the scraper rings.



Nylon was created symultaniously by two Dupont chemical plants. One in New York and one in London. Hense the name NY Lon. I work with Dupont *Invidia now, so I know this is fact.