Replacing Head Gasket with O-Ring
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- Опубликовано: 7 янв 2024
- This week I replace the copper jointing spay head gasket (if you can call it that) with a Viton O-ring and some Hylomar universal blue. I attempt this at first on my CNC mill which ends in failure so I end up machining the O-ring groove on my trusty lathe. I also talk a bit about the V4 2 stroke project in regards to the lost foam pattern.
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Cheers from the PNW Seattle WA USA.
That o-ring might be better if it were copper.
Cool experiment, and awesome project!
Thank you. I’ll know after this weekend whether it was a good idea or not haha.
Hi. Just find your channel. That is amazing! You do things like me! I have been using just a regular hi temp engine sealant silocone for cylinder head sealing. It works just fine on liquid cooled engines, and as well on air cooled ones. And of course it works just fine as usual engine sealing as it is named. But yeah, you really have a brilliant youtube channel! This is just the way I like it!! Thanks a lot for these nice videos! I appreciate very much!
Thanks, I’m glad you’re enjoying the videos.
Thanks for the update video and good luck with your race event. Note that eliminating the head gasket will shift the cam timing.
Thanks for that, To be honest I didn’t really think about this, but I have spaced the base of the cylinder with a solid aluminium spacer gasket to mitigate this.
I've used viton o-rings as gaskets on 2-strokes and they lasted well. No reason for it to be any less reliable on a 4-stroke.
That’s my thinking. They held up well for another weekend of racing, with some exhaust tuning the motor is getting even faster
I don’t think the Viton will take the combustion pressure.
I would suggest a stainless tie wire ring in a groove cut into the liner. 1/32 or 1/16 dia wire this will embed in the head so use the smaller wire first and use the larger wire if there is a leak.
You could also use copper wire annealed as well.
Cut the end on an angle and keep the gap to a minimum, a scarf joint would be ideal.
You can then use a counterbore to cut the o ring relief in cylinder face around the stud for the lube pressure oil feed
Then use RTV for the chain tunnel.
Good luck and take care.
Viton O-Rings will easily cope with the bulk temperature of the head, but any direct contact with combustion gasses and they will fail quickly. They may survive long enough if the head and barrel are very flat.
Gas filled copper o-rings are the usual choice for sealing cylinder heads without a gasket. Stainless wire is normally used to increase crush on a head gasket gasket fire ring.
I’m thinking it’ll be fine. I figured the Viton o ring works on every 2 stroke mx/GP bike so it’ll probably work here provided the groove is the correct size and the surfaces are flat.
If the engine was boosted I would definitely go for a wire ring.
@@OddsandEndsMachining personally I would have used either a fire ring as on Volvo truck engines or GM 2 strokes, or a longer sleeve(shorter cylinder muffler) with a step and no gasket ala Vincent.
Fire rings allow non conformity between the head n barrel instead of lapping individually of head n barrel.
But then I am strange and do the difficult.
Enjoying all this and look forward to the 4, worked on Suzuki and Yamaha 4 in the day, fun to ride.
Take care.
Be interesting to see how long this lasts... normally you'd use a stainless steel oring in conjunction with a copper head gasket. Both the head and the barrel need to be grooved at specific a depth/width.
I’ll let you know, the viton o ring seems to work in every 2 stroke mx bike. I might as well give it a nudge with the stakes being so low.
Very nicely done! When you pulled the end mill out I seriously wondered why didn’t you use the lathe? Even a neutral rake high speed steel bit on the lathe would have done a perfect job of making that groove.
The was the obvious choice, I was going to machine the small o ring groove in the same set up and the small one would’ve been too hard in the lathe. But In the end all went well.
Chur you, enjoy the race :)
Hopefully it holds together