Ceramic Apex seals, yeah or nay?

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09-16-2007, 05:54 PM

#11

BLUE TII

Member

Join Date: Oct 2004

Posts: 83

Wow, that is nice that you had that connection and were able to work a trade out!

I want to try the ceramic seals too, but I am busy breaking everything else it seems

Last rebuild went ~20,000 miles until an EGT probe melted off and stiuck a corner seal- causing stuck sideseals and basically stuffing my 3mm apex slot rotors I was going to use for 1 piece 3mm ceramics.

Latest motor; didn't torque intermediate housing coolant drain plug when rebuilding (doh) and lost it part way up the hillclimb. It got hot and I kept it idling the whole time back down to the pits with NO coolant. Let it cool slowly by not opening the hood and raced it the next day! Motor seems fine. Perhaps the 720cc primarys at full pulse width (coolant correction map) helped cool it a bit? I was hoping that rich would stop the motor when I made the map...

Now, lost the front housing stationary gear locating dowel pin and sucked it into the oil pump. Luckily everything is fine except the oil pump and dowel pin. Doh, could have raced it this weekend if I would have taken it apart sooner.

It seems scary to risk new housings and ceramic seals until I figure out how to keep it together with the junk parts I am using now...

At least I am not repeating my mistakes :P

10-03-2007, 04:07 PM

#12

iox106

Junior Member

Join Date: Sep 2007

Location: Deltona, FL

Posts: 15

How much of a discount do you get from Mazdaspeed?

Would the give the discount for a car thats not Mazda but has a rotary in it?

10-03-2007, 04:14 PM

#13

iox106

Junior Member

Join Date: Sep 2007

Location: Deltona, FL

Posts: 15

Whoops

Quote:

Originally Posted by iox106' post='884123' date='Oct 3 2007, 05:07 PM

How much of a discount do you get from Mazdaspeed?

Would they give the discount for a car thats not Mazda but has a rotary in it?

06-05-2008, 08:48 AM

#14

greendotracing

Junior Member

Join Date: Jun 2008

Posts: 1

Has anybody used or know anything about these seals?

http://cgi.ebay.com/ebaymotors/ws/eBayISAP...sid=p2759.l1259

TIA

07-03-2008, 08:29 PM

#15

13BT_Starlet

Member

Join Date: Dec 2007

Location: EastCoast , Florida

Posts: 78

Quote:

Originally Posted by greendotracing' post='901511' date='Jun 5 2008, 09:48 AM

Has anybody used or know anything about these seals?

http://cgi.ebay.com/ebaymotors/ws/eBayISAP...sid=p2759.l1259

TIA

Those seems to look like the RA Classic seals , If they are the one's they are not ceramic .

07-03-2008, 10:12 PM

#16

Lynn E. Hanover

Fabricator

Join Date: Jan 2004

Location: Central Ohio (Hebron) Zephyrhills Fla.

Posts: 1,322

Quote:

Originally Posted by 13BT_Starlet' post='903519' date='Jul 3 2008, 06:29 PM

Those seems to look like the RA Classic seals , If they are the one's they are not ceramic .

There should be two springs for each seal if real Mazda ceramics. As far as use goes, there is nothing better at all if you can afford them. Every serious race engine has ceramics.

It is a bolt on 5 HP on top of any other seal. A must to get to 11,000 or more RPM. The ceramics look kind of greenish grey. Carbons are far less strong but nearly as light and do not wear the housings. They use a single spring.

Great in NA engines. Light enough for huge revs. Low drag compared to steel, but not close to ceramics drag wise.

Lynn E. Hanover