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Cometic head gasket group buy
https://www.slantsix.org/forum/viewtopic.php?t=50951		 Page 3 of 3
Author:  billdedman [ Thu Jan 31, 2013 12:19 pm ]
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Wow, Charlie and CNC DUDE; thanks loads for all the good copper head gasket information! What size wire and what size groove would you recommend for the O-Rings? I don't plan to put a receiver groove in the head. just a flat surface on the othr side of the gasket.

As usual, thanks for all the good info/advice! Gotta seal this thing up!!!

Bill in Conway, Arkansas
Author:  CNC-Dude [ Thu Jan 31, 2013 1:17 pm ]
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Sure Bill, no problem. For a .060" diameter O-ring wire, you need to shoot for having the wire to stick up between .006"-.008" above the deck surface when using a .040" thick gasket. Don't use copper wire like some folks do, it totally defeats the purpose of o-ringing to begin with. Use a precision ground hardened wire for the job.
Author:  billdedman [ Fri Feb 01, 2013 12:40 am ]
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So, for the cutter that makes the groove in the block surface, you want an interference fir of how much? That is, how wide should the groove be cut?

I understand about the material; can't use a soft wire like copper; you wouldn't get the high unit loading needed for this application with anything but hard wire. But, I need to know about that cutter size. I understand, too, about the depth of the cut, just not the width for the proper amount of interference fit.

Thanks for any information!!!'

Bill
Author:  CNC-Dude [ Fri Feb 01, 2013 12:43 am ]
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Bill, its just slightly undersize, maybe only .001", just enough to hold the wire from popping out of the groove.
Author:  billdedman [ Fri Feb 01, 2013 8:24 am ]
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Okay; gotcha... thanks!!!

Bill
Author:  bmimken [ Wed Feb 06, 2013 5:18 pm ]
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What method is used to determine the recommended copper gasket thickness? Is there a general rule of thumb, or merely personal preference?

Thanks,

Brian
Author:  CNC-Dude [ Wed Feb 06, 2013 11:46 pm ]
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Well, on most engines that have a cylinder head with a quench type chamber in them, it is found that a quench distance of .040"-.060" is ideal for maximum benefits that come from having that type of chamber design. So, this typically means that the target deck height for the piston is between -.005" to zero, and then you would use a .040" gasket thickness to put you right on track for the optimum quench thickness. Most engines that have a quench type chamber have gaskets available in a .040" thickness, coincidentally. Checking the pistons deck height correctly becomes very critical when using a quench type of chamber, i've seen pistons touch the head with .032" piston to head clearance. :shock:
Author:  Charrlie_S [ Thu Feb 07, 2013 3:42 am ]
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Since the slant head is not a "quence" type head. My point of view is use the gasket thickness to adjust the compression ratio. Like if you have 10-1 NA, and add a blower, use a thick gasket to lower the CR, rather then doing another head.
Author:  terrylittlejohn [ Sun Feb 10, 2013 5:51 pm ]
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charlie those SCE price are a lot cheaper than when i called year before you had the group buy, they wanted $265cd for one gasket. do you have any contacts there to get a .040 3.504 bore gasket?
Author:  Charrlie_S [ Sun Feb 10, 2013 7:17 pm ]
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I don't have any contacts. I just gave them a call, as I knew they had the slant gasket at one time (put one on my turbo engine in 1981).
I would give these people a call, also. They say they don't charge extra for "special" bore sizes (unlike SCE), and they do have better pricing.
http://clarkcopperheadgaskets.com/cchg/ ... tent/?id=1
No contacts there, either. Just a google search and a phone call.
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