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Location:
Finland
Registered:
November 2002
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mhg/o-ring dilemma
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Sun, 10 October 2004 11:10
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I tried to search but didn't find anything useful regarding to o-ring design or dimensions. My plan is to use copper head gasket and o-rings. Look the cross section pic I made. Does the design or the dimensions look anything right.
The red part is the o-ring.
Yellow part is the head gasket.
Rest (white) is the block.
The plan is to machine 2mm deep, 3mm wide groove in the block and o-ring will be 2.98mm thick. This 2.98mm is based on assumption that the copper sheet will be 1.00mm thick. Head deck surface will be plain. I can cut the head gasket by laser and I have already made cad drawing of the HG. Once the annealed(correct word?) copper head gasket is assembled it will be compressed 0.02mm and o-rings will seal the combustion chambers. Would this work???
here's the cad drawing of the design. Change it the way you see better!
http://toyotacover.50megs.com/sekalaiset/liekki rengas.dwg
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: mhg/o-ring dilemma
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Sun, 10 October 2004 13:36
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o-ring material?
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Location:
Brisbane CBD
Registered:
September 2004
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Re: mhg/o-ring dilemma
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Sun, 10 October 2004 15:12
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i always thought that you left a mm or 2 from the edge of the bore it is used to clamp the copper better aroudn the bore diameter? true or false
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Location:
Lost in the K hole
Registered:
May 2002
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Re: mhg/o-ring dilemma
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Mon, 11 October 2004 08:12
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i wrote a big reply to this last night, then accidentally deeted it 
in short - what youve drawn is a recessed fire ring. normally fire rings are neither recessed, nor used with copper gaskets.
what you want is a recessed ring, a few mm from the bore edge, that just protrudes from the block surface, and sits UNDER the copper material to provide a circumfrential ring of increased clamping pressure... thus holding the soft copper in place against combustion pressure.
ed
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Location:
Finland
Registered:
November 2002
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Re: mhg/o-ring dilemma
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Mon, 11 October 2004 10:42
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Anything like this?
I dont like this design. 
First one was better IMHO, with fire ring bit out from the edge as suggested and maybe bit more clamp to the HG.
Few points that I forgot to mention earlier:
Engine will be turbo charged.
Oil goes into head through external pipe.
Water channel can be O-ringed too with rubber O-Rings.
I have seen several o-ring approaches. But they all have been made by some sledge smiths. I just haven't seen proper one.
Thanks in advance...
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Location:
Brisbane CBD
Registered:
September 2004
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Re: mhg/o-ring dilemma
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Mon, 11 October 2004 11:59
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just go for a grove not a recess the wire will fall right in the bore like that
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Location:
Finland
Registered:
November 2002
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Re: mhg/o-ring dilemma
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Mon, 11 October 2004 12:45
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Wire?
I'm thinking solid steel ring.
But yeah I get your point.
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