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Post by jon on Aug 15, 2020 13:58:59 GMT 1
Hi all,
Does anyone know who machines heads for an o ring?
Jon
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Post by wallcraft on Aug 15, 2020 15:50:42 GMT 1
Pretty sure mutts does them now.
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Post by muttsnuts on Aug 15, 2020 20:22:20 GMT 1
yep, I does
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Post by 4l04ever on Aug 15, 2020 20:24:04 GMT 1
Put up a pic! :-)
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Post by midlifecrisisrd on Aug 15, 2020 20:27:07 GMT 1
Yeah, pics or it didn't happen 😆
Steve
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Post by muttsnuts on Aug 15, 2020 21:11:18 GMT 1
not got a YPVS one to photo, but here's an LC one  |
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Post by muttsnuts on Aug 15, 2020 21:13:15 GMT 1
currently got jigs to do LC and YPVS heads, will get round to making more jigs for other heads like TZR's, TDR's etc, but need time and an head to make the jig against
Can do skimming, O ring, profile/doom cutting etc, so each job as one offs or do the whole lot on a head
Can also take 250 heads out to 350, generally make the squish 65.5mm diameter, but can go upto 66.50mm if required for large over bored engines
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Post by flames on Aug 15, 2020 21:20:46 GMT 1
currently got jigs to do LC and YPVS heads, will get round to making more jigs for other heads like TZR's, TDR's etc, but need time and an head to make the jig against Can do skimming, O ring, profile/doom cutting etc, so each job as one offs or do the whole lot on a head Can also take 250 heads out to 350, generally make the squish 65.5mm diameter, but can go upto 66.50mm if required for large over bored engines You are a very clever man....in time you will be clever enough to take photos of an o ringed ypvs head....🤣🤣🤣🤣 |
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Post by st66 on Aug 15, 2020 23:00:51 GMT 1
But can you do barrels Mr Nutts,  ?? |
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Post by midlifecrisisrd on Aug 15, 2020 23:29:16 GMT 1
But can you do barrels Mr Nutts, ?? Head is better 😁 Not many reasons to change a head A fecked barrel is much more common Steve |
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Post by muttsnuts on Aug 16, 2020 11:14:41 GMT 1
But can you do barrels Mr Nutts, ?? yes if need be, more tricky though |
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Post by JonW on Aug 16, 2020 14:07:11 GMT 1
I thought these would be 2 rings per cylinder, ie to keep the combustion from the water and to keep the water from the atmosphere?
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Post by Tobyjugs on Aug 16, 2020 14:40:35 GMT 1
This was made by the old Metmachex company.  |
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Post by Tobyjugs on Aug 16, 2020 14:52:40 GMT 1
I thought these would be 2 rings per cylinder, ie to keep the combustion from the water and to keep the water from the atmosphere? Two O-rings on a 4LO engine isn't enough in my opinion. The reason being you have to have a complicated O-ring groove for the outer sealing or another eight small rings to seal the long nuts. One O-ring and sealant will be a lot easier but you have to be frugal with the sealant as you can restrict your cooling water passages. |
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Post by midlifecrisisrd on Aug 16, 2020 15:35:42 GMT 1
May seem a funny question but that metmachex head
Are the grooves just flat bottomed?
Reason I ask is I was speaking to an engineer and he was saying they are difficult as the groove profile should match the o ring as in the bottom is curved
Said it was to do with sealing force as the bottom of the ring has nowhere to deform into so all the pressure is on the face of the ring not in the groove
Steve
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Post by Tobyjugs on Aug 16, 2020 17:11:19 GMT 1
May seem a funny question but that metmachex head Are the grooves just flat bottomed? Reason I ask is I was speaking to an engineer and he was saying they are difficult as the groove profile should match the o ring as in the bottom is curved Said it was to do with sealing force as the bottom of the ring has nowhere to deform into so all the pressure is on the face of the ring not in the groove Steve Yes its square. Most O-ring grooves are square, and for the type of thing your engineer is talking about you can use soft teflon support rings or the rubber ring will have another shape/profile such as a "D-ring" |
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Post by st66 on Aug 16, 2020 19:07:46 GMT 1
But can you do barrels Mr Nutts, ?? yes if need be, more tricky though Excellent just to match these two barrels mutts mate or wot would your suggestion be ie leave as is, ,, drop me a pm with your number mate if possible and we can have the crack would be appreciated as I've loads for you to do mate when you've time as I know your constantly busy  |
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Post by muttsnuts on Aug 17, 2020 9:12:47 GMT 1
This was made by the old Metmachex company. The outer ring requires a CNC machine and are hard to do. Using one ring is easier and using a bit of sealant is all that is required to seal the water waysas the head is flat to the barrels anyway, the O ring is squeezed flat between the head and barrels, it doesn't sit flush. Also, the metmachex ones the O ring groove is too close to the stud holes and I've had 3 heads in where the O ring has been cut because the O ring groove intrudes into the stud hole, I use a different size O ring on the YPVS head so that there is no chance of that happening |
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Post by muttsnuts on Aug 17, 2020 9:13:59 GMT 1
yes if need be, more tricky though Excellent just to match these two barrels mutts mate or wot would your suggestion be ie leave as is, ,, drop me a pm with your number mate if possible and we can have the crack would be appreciated as I've loads for you to do mate when you've time as I know your constantly busy should be possible, would need both barrels to match them up, plus ideally an O ring, but if you haven't got one then I can work out what size has been used, but it can be a pain to do |
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Post by st66 on Aug 17, 2020 9:21:08 GMT 1
Yeah I thought it would be mutts mate, but you can have the whole engine mate and need some exhausts, carbs and all set up but ile speak to you about it first cool many thanks ANTH
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Post by Tobyjugs on Aug 17, 2020 9:56:54 GMT 1
This was made by the old Metmachex company. The outer ring requires a CNC machine and are hard to do. Using one ring is easier and using a bit of sealant is all that is required to seal the water waysas the head is flat to the barrels anyway, the O ring is squeezed flat between the head and barrels, it doesn't sit flush. Also, the metmachex ones the O ring groove is too close to the stud holes and I've had 3 heads in where the O ring has been cut because the O ring groove intrudes into the stud hole, I use a different size O ring on the YPVS head so that there is no chance of that happening This one is ok (just), never had a cut ring but i do have to change the inner rings roughly 1.5 to 2 years depending on the use and i have also opened/shut it a few times with the same rings. Dave you need to put your prices up and buy a cnc machine  |
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Post by midlifecrisisrd on Aug 17, 2020 11:43:29 GMT 1
If I'd known then you would of had my last 2 heads ☹
Steve
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?? 
