3M / OS header O-ring size

[Woodward James R Civ 412 TW/DRP/ACQ]

I suggest that you use two supports for the exhaust system.  If you only
mount the pipe in one place, within 25 flights the shaking of the engine on
a Hyde mount will loosen up the o-ring fit.  Currently, I have 1 pipe mount
at the aft end of the pipe, and one mount at the neck of the pipe.  This
leaves the silicone coupler and o-rings to keep the header in place and
handle the shaking of the engine.  Or, I guess you could mount the pipe in
the back, and make a mount for the header.  Up to you.  The cooling fins on
the back of the 170 do not allow for fit of an OS/ MACS header, unless you
either modify the header flange, engines cooling fins, or have a short (1/4"
or so) adapter.

 

Jim W.

 

-----
From: wgalligan [mailto:wgalligan at cnbcom.net] 
Sent: Friday, May 23, 2003 12:13 PM
To: discussion at nsrca.org
Subject: Re: 3M / OS header O-ring size

 

If your still talking about the green A/C o-rings you can get those at most
automotive stores off the shelf.  They usually come in a multi-size pack. 

 

Jim...  do you mean you need to support the pipe at the front and back?   I
usually just use one Dave Brown hush mount just past the center of my pipe.
No support on the front end.  But I am useing a solid header on the OS.  But
I plan on using the o-ring header that came with my Mintor 1.70.

 

Wayne

 

----- Original Message ----- 

From: Del <mailto:drykert at rochester.rr.com>  Rykert 

To: discussion at nsrca.org <mailto:discussion at nsrca.org>  

Sent: Saturday, May 24, 2003 4:50 AM

Subject: Re: 3M / OS header O-ring size

 

I take my old o ring with me and match it up with what they have in their
cubby drawer with "O-rings".  

 

Del

 

----- Original Message ----- 

From: Woodward James R Civ 412 TW/DRP/ACQ
<mailto:James.Woodward2 at edwards.af.mil>  

To: discussion at nsrca.org <mailto:discussion at nsrca.org>  

Sent: Friday, May 23, 2003 10:10 AM

Subject: 3M / OS header O-ring size

 

Hi All,

 

Does anyone have a part number or size that I can use to go to the hardware
store and get some more of the rubber o-rings for the headers?

 

I've found that if you don't support the pipe and header, they wear out
fast!

 

Thanks,

Jim W.

 

 

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