nemeii

5mm apex seals fact or myth ??

some guy near me is boasting them, but ive nevr heard of it ???

ijneb

I dont think he knows what he is talking about.

3mm is as big as i've heard in the last ~30 years.

andre sinclair

iTrader: (36)

I have been around for a long time too and never heard of a 5mm. However, I`ll heard of 2mm, 3mm, 3.5mm, 4mm and 6mm.

evil7.com I believe was using a 4mm in there 20B PERIF. Turbo.

I know that mazda specialist manufacture these sizes too...check their web site.

http://www.rotaryengine.ca/




Andre`

Narfle

iTrader: (16)

what is the advantage of a 6mm seal?!?

DCrosby

Girth !

Well if you go by the discussion 2 / 3 mm, more resistance to detonation, and more housing wear.

Herblenny

iTrader: (13)

I've heard something about 5mm.. but not for 13b but some other rotary engine.. I want to say rx2 engine maybe?? I think it was stock seal for vintage rotary..

nemeii

idk , i heard it from a guy that runns a performance shop , maybe ill just try to get in touch with the kid selling it, thanks for the info though, would 5mm be better for "short term" extreme performance" or would it just be just ridiculous and not really bear any good effects?

Michael_Rudy

6 mm were in old dual distributer 12a's i have a 6mm apex seal engine at my house they have dual side seals too

t-von

iTrader: (8)

Got any pics?

Michael_Rudy

i will take some for ya guys tommorow, they are carbon apex seals pretty cool looking rotors, the only 12a's that came with a lightened eccentric shaft like the 13b's

razorback

hurleyrotary.com sells 4mm duplex seals and 3.5 long life seals.
(click on the seals and tip seals, look through them all, several very intersting seals they make/sell)

peejay

All Mazda rotaries '67-73 had the Big Fat single piece seals. 5mm or 6mm, every time I say it's one someone tells me I'm wrong but suffice to say, they're Friggin' Huge.

They needed to be, given that they were made of the same Carbon-Aluminum material that race seals are made of. You know, the seals that are weak as hell and don't last very long. Mazda hadn't yet figured out how to make the housing surface last with a longer-lived material, but they had to throw *something* into production (some weird clause in the Wankel consortium agreement) so they went with what they had. And took six years to put something better into production.