creating an o-ring groove in a triz head

[zzmegad]

I came across a post the other day where someone was saying they don't know why people use head gaskets anymore, when they could be using an oring. So I was looking at my triz head and I'm not sure if I can do it. My first thought was an inner and outer ring, but then what about inbetween the coolant galleries and what do I use to make up the space of the head gasket?

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[zzmegad]

after looking at these pictures it doesn't even look like i have room for an inner and outer... :mad:

[Billy Golightly]

You can buy a sprock coolhead for a lot cheaper than any shop would O-ring a stock one :)

[zzmegad]

is that how you guys do it though? In inner for compression and an outer for coolant? Or do you use a special shaped o-ring? Eventually I probably will buy the sprock head. I just wanna try and do something myself and I got access to a couple bridgeports with little cnc retrofit things on em. If it's just the milling of the groove, I think I can handle it

[stubble_jumper]

Just go for the Sprock head and safe the headaches. I'm very happy with my Sprock head.

[bcredneck]

its a waste of time just use rvt if you dont want a gastket and even if you get the slot cut good luck finding the perfect size o ring to go in it rvt works fine

[zzmegad]

Finding o-rings and cutting the slot to match wont be a problem, even if its a special star shape or something. The main problem I was thinking of is the head will be .015" or so closer with the absence of the head gasket. Using RTV would produce the same issue and it's just sloppy. I don't know enough about it. I'll give them guys in MO a call, and see if I can get a cool head.

[Bryan Raffa]

I think you will have to re cut the dome also.. to make up for the thickness of the gasket

[Billy Golightly]

its a waste of time just use rvt if you dont want a gastket and even if you get the slot cut good luck finding the perfect size o ring to go in it rvt works fine

Holy crap. Dude, please quit posting stuff like this. Using RTV on a cylinder head is NOT ACCEPTABLE, wow.

[Mosh]

But maybe RVT is..haha.

The squish on most factory Z's can be anywhere from .050 to .063 from what I have seen.

IMO Z's dont like tight squish since they are already a bottom end and midrange engine.

Measure the squish without the gasket. If it is at .045 or above, run it with just o rings, but be prepared to run a 50-50 race gas mix if pinging develops.

You will also need special Hi temp silicone o rings. Standard rubber ones will not work or hold up under the pressure and heat.
If your Jug deck has any pull up around your studs, (common on the Z jugs) you will need to shave that down smooth or the o rings will not seal. You will also need to use teflon sealer around the studs.

[zzmegad]

sweet, thanks for all the good info, this is gonna be something I'm gonna try once I'm confident I know what I'm doing. I want to learn more about squish ratio's and performance tuning. I just need to spend the time and do some reading. My Z seems to lack the low end power I desire. I know it can be better. When I get it put back together and broken in, I'm gonna try a leakdown test and see what that tells me...

[Buster Brown]

The RVT thing is amazing. :)
Too funny. Billy & Mosh took care of my thoughts. Well said.......

[RideRed250R]

Holy crap. Dude, please quit posting stuff like this. Using RTV on a cylinder head is NOT ACCEPTABLE, wow.

billy lay off the dude, its guys like him that keep me in business...


btw have you seen my website LOL