1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

One Piece 12a Apex seal?

Thread Tools
 
Search this Thread
 
Old 07-08-08, 09:41 PM
  #1  
Stu-Tron Get Yo Groove On

Thread Starter
iTrader: (4)
 
Jeezus's Avatar
 
Join Date: Nov 2006
Location: Huntsville AL
Posts: 8,405
Received 9 Likes on 9 Posts
One Piece 12a Apex seal?

Does anyone make any 12a one piece seals that are not carbon/ceramic?

Searched the forum/mazdatrix/atkins, and no dice.
Old 07-08-08, 09:55 PM
  #2  
7less for now!

 
yetterben's Avatar
 
Join Date: Oct 2007
Location: eau claire
Posts: 1,372
Likes: 0
Received 0 Likes on 0 Posts
i thought all 12a seals where one piece? guess they are two piece?
Old 07-08-08, 10:01 PM
  #3  
djessence

 
djessence's Avatar
 
Join Date: Aug 2007
Location: Alberta, Canada
Posts: 2,062
Received 0 Likes on 0 Posts
Originally Posted by yetterben
i thought all 12a seals where one piece? guess they are two piece?
Most are 2 peice. The big long bit and the short corner.
Old 07-09-08, 01:33 PM
  #4  
1st-Class Engine Janitor

iTrader: (15)
 
DivinDriver's Avatar
 
Join Date: Jun 2008
Location: Chino Hills, CA
Posts: 8,376
Received 26 Likes on 24 Posts
Stock 12a apex seals are 2-piece electron-hardend steel, but 3-piece seals existed at one point, and 1-piece race seals are common (though they work poorly when cold)

I'm not sure if a one piece metal seal would work - - thermal expansion would probably kill ya, unless you left so much end clearance that you'd have zero compression cold. The main reason for the short corner stock piece is to allow for thermal expansion of the main piece.

But that's just guessing.
Old 07-09-08, 06:49 PM
  #5  
Moderator

iTrader: (3)
 
j9fd3s's Avatar
 
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,835
Received 2,604 Likes on 1,847 Posts
Originally Posted by DivinDriver
Stock 12a apex seals are 2-piece electron-hardend steel, but 3-piece seals existed at one point, and 1-piece race seals are common (though they work poorly when cold)

I'm not sure if a one piece metal seal would work - - thermal expansion would probably kill ya, unless you left so much end clearance that you'd have zero compression cold. The main reason for the short corner stock piece is to allow for thermal expansion of the main piece.

But that's just guessing.
3 piece seals are only for the 86-03 13B's. if you have a 12a with 3 piece seals, something bad happened




All times are GMT -5. The time now is 04:38 AM.