O ring head gasket

[Vietti]

I'm building the Hoglet and want to try an O ring head gasket. The O rings I have are 1/16" by 1.25", Viton. The question is how deep should the groove in the head be, how much crush? The rings are about.070" in thickness. On scrap a groove of about .045 seems about right. Or would the best idea be just use a traditional gasket and not risk the heads which already have a lot of work done?

 

[danallen]

.045 seems shallow. The Farm Boy hit n miss is designed for an o-ring head gasket and calls for a .060 deep groove.

 

[gld]

A copper ring will last better than any 0-ring.

 

[Asm109]

This is THE bible for all things O-ring.

https://www.parker.com/literature/O-Ring Division Literature/ORD 5700 Parker_O-Ring_Handbook.pdf

 

[a41capt]

I’ve started printing TPU gaskets. They seem to hold up to the heat well enough and are pretty impervious to oils and fuels.

 

[Longboy]

I use O-ring (3/32 to 1/8 in.) head gaskets exclusively on my models in conjunction with the cylinder liner that rises above the deck to cage the O-ring. A matching groove is cut in the cyl. head and block for the O-ring to seat into. Not worried about the crush height and you should see the O-ring between the head and block after torque down. The O-ring is not exposed to combustion gasses for deterioration and just ordinary nitrile plumbers material is used here. The key is the cyl. liner support for the O-ring.