-----Original Message-----
From: Jim Gray [mailto:toodamnfunky@comcast.net]
Sent: Saturday, September 12, 2009 7:24 PM
To: 'MORDY DUNST'
Subject: RE: [Fot] Beware of Moss figure eight gaskets
Mordy,
I agree about not being able to compress the copper..006 is a lot to
compress. I made a set of aluminum bars I cinch down on top of the liners
to simulate the head being in place so I measure liner protrusion under
pressure. My liners and deck height were sized for.004 with the steel
gaskets. I assemble things just as you do.
I have the right figure 8's now and my liners settled down exactly where
they should be. I just don't think it's a good thing to offer gaskets in
different thicknesses without at least a note to the buyer.
It would have certainly resulted in a head gasket failure...again!
jg
-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of MORDY DUNST
Sent: Saturday, September 12, 2009 6:09 PM
To: fot@autox.team.net
Subject: Re: [Fot] Beware of Moss figure eight gaskets
You would never have enough clamping force on the liners to crush dead soft
copper fig of 8's appreciably. No, the liner gaskets need to be at the
appropriate thickness to raise the liners to the proper height. Naturally,
this measurement needs to be done under some load.
What I do is meticulously clean the the block liner perch and ensure the
liner pedestal is clean. -then fit the liner bare. Measure the liner
position relative to the deck. I use a simple but straight edge and use a
feeler gauge to get the clearance. Then make a determination as to the fig
of "8" gasket needed to get the liner to .005" in my racing motor. .003" is
not enough (me thinks). I make individual rings for each liner as needed.
I can't believe that figure of 8 gaskets still exist. I may have .012" on
one liner and .014" on its neighbor. Alternatively, I sometimes face off
the liner on a lathe to clean it up and use thicker rings as needed.
For the purpose of a sealant on the bottom of the liner to the block... use
a very thin coat of aviation gasket sealant, gascachinch, indian head
shellac... or some thin goop. You don't need much. At one time I used no
goop at all. I don't use yammabond, hylomar, silicone Rtv for this purpose
they will raise the liner a bit.
Mordy
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