Has anybody tried using rotary performance seals? How do they hold up in comparison?
they have 2mm race spring and 2mm street springs. theirs no info on there site about them other then that so i thought i would ask you guys.

 

Ive never hear of "rotary performance seals".

Do you have a link to the manufacturers site?

 

http://www.rx7.com/store/rx7/fcengine_internals.html <~~ site

 

Theres no information regarding the manufacture of those rotary performance seals. Id bet theyre somethink like atkins/ra seals sold under another name.

I assembled my new engine tuesday night (1 week rebuild ) so soon enough will find out if the housings are worn enough to affect compression.

I kept sideseal clearances much tighter this time between 0.0015 - 0.0025".

Just waiting on my clutch to come back then im ready to go.

 

Only time will tell.

That housing doesn't look bad at all. Is that the one you said looked better?

 

Nah man, thats the same rotor housing (rear) as pictured a few pages back.

Also someone was mentioning the surface finish of RA vs OEM apex seals.

Well i cant recall what the RA ones were like I think they were smooth/shiny.
The rx5 3mm OEM seals ive used in this build were a rough finish.
I would assume a rough finish will bed in sooner than a polished finish.

 

Cause of engine failure has been identified.

I had marked the crank pulley wrong, we had 15 deg advance more than what we thought.

I guess that explains the carnage......
Suprising that it went almost all day being thrashed as hard as it was.

Maybe when I remark the crank & reset base timing I can saftely add 5-10 deg more advance.

 

That would be me. I'm going polish the seals for the rear rotor and install the seals in their raw state in the front for my rebuild to see if it makes a difference.

 

i was at atco today for the rotary Vs piston event and came accros a stand called
goopyapexseals.com.. has anybody herd or used there seals?

 

Page is under consturction?

 

interesting... i like seeing new products, although i don't know if anything can match stock for longevity and power, or ceramics for detonation resistance...

i'd like to see tighter tolerances in the motor so the apex seal would be a little bit more shrouded from the combustion...that wouldn't cure anything, but may give a little window for you to back off if you start detonating...maybe

 

How do tighter tolerances in the combustion seal strengthen the engines ability to supress detonation. Also detonation is caused usualy buy hot temps and lean mixes right? I know this is when it happens but sometime I hear about detontation happening in domestics but their cause is always different than when it happens to our rotories.

 

tighter tolerances between the rotor and housing would have the apex seal "see" less of the combustion event.

the cause of detonation is exactly the same.

 

I get you now, I miss understood I though you were talking about the tollerence of the apex seals ane the rotor.

Is it true that detonation is super sonic?

 

But then with tighter tolerances, you would have a lower rpm range.

 

eh

 

asking again.... anyone use rotary aviation seals on new housings?

 

I am. I have a reman (with new housings) that I got ported and added these seals to it. I only have 300 miles on the engine so far, so I can't say if these seals are causing any problems or not. Runs great though.

 

im curious because... the new housings have a coating to break in the seals faster, so its abrasive, i wonder if the abrasive nature of that coating smoothens out and keep the housings safe from further wear

 

FYI RA did recommend new housings for a faster break-in with their seals. I think there are maybe some pics posted on Nopistons showing the condition of a new housing after tear down with these seals.

 

Ok here are some pics of an engine that was recently torn down with RA seals. The housings were used prior to the rebuild and had 85k on them. The engine lasted 15k after the rebuild and was damaged possibly due to lubrication problems.







Opinions?

 

Those housings look fine.

Stat bearing journal on the e shaft looks like it had a bearing failure/starved of oil.

 

That's pretty much what happened. The guy didn't premixed either.

 

So engine falure was caused by poor lubrication or loss of compression? I've been following but this thread is on page 17 so you know how it goes.

 

So do we know what the cause of the failure was? Did it spin a bearing, did it run out of oil???

The housings look good from what i can see but how was it driven & tuned?

I would expect the housings to look good if it had tame timing & was driven by a granny.

I will be impressed if it was tuned on the edge & driven hard.