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Post by mak595 on Jun 15, 2020 21:00:06 GMT 1
Guys, apart from obviously not needing a head gasket, is there any advantages/disadvantages for using a o ring head on a PV?
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tommo
Drag-strip hero
Posts: 279
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Post by tommo on Jun 15, 2020 21:06:15 GMT 1
cheaper
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Post by mak595 on Jun 15, 2020 21:10:37 GMT 1
What as in, you can remove the head and not have to buy a new gasket each time? |
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Post by dusty350 on Jun 15, 2020 21:15:31 GMT 1
Yes, reusable  |
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Post by JonW on Jun 16, 2020 5:26:21 GMT 1
Depends on what it costs to do the O'ringing as you'd need to factor that in. if you do it and then sell the bike its not really saving you anything etc. lol
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Post by marrcel on Jun 16, 2020 7:02:35 GMT 1
You can reduce your squish and raise compression that was for me the main goal.
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Post by mak595 on Jun 16, 2020 9:12:36 GMT 1
Just asking cos I could do with a good 350 head I've got a couple but not mint. I've seen a good head that's o ringed
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Post by muttsnuts on Jun 16, 2020 9:41:02 GMT 1
I do them exchange
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Dave B
Drag-strip hero
Posts: 240 
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Post by Dave B on Jun 16, 2020 10:01:25 GMT 1
The main reason is for accuracy. On an engine that is tuned right to the edge of detonation, with optimum squish clearance and compression , you need to be sure that the head is always exactly the same distance from the top of the barrel. Unless you gauge your head gaskets every time you lift the head, and take extreme care to avoid the head gasket from protruding into the combustion chamber, or leaving a a gap between the bore of the cylinder and the bore of the gasket, you are better advised to use O rings. They improve heat transfer and even out the temperature gradient across the head joint too.
On the other hand, very few engines are set up that closely to detonation, especially on the road, it probably does not matter.
So if you are looking for that last quarter of a horsepower, you know which way to go.
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Post by midlifecrisisrd on Jun 16, 2020 12:29:09 GMT 1
Then start doing them for 385 ypvs heads 😁 Steve |
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Post by tell7437 on Jun 16, 2020 12:38:10 GMT 1
What material is the o rings?
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Post by muttsnuts on Jun 16, 2020 13:38:55 GMT 1
Then start doing them for 385 ypvs heads 😁 Steve I am nearly there, just need a few more heads so I can do an exchange basis, got one here ready to go if your stuck, bloody things are expensive to buy at the moment, so waiting for prices to drop a bit ! |
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Post by midlifecrisisrd on Jun 16, 2020 13:53:47 GMT 1
Then start doing them for 385 ypvs heads 😁 Steve I am nearly there, just need a few more heads so I can do an exchange basis, got one here ready to go if your stuck, bloody things are expensive to buy at the moment, so waiting for prices to drop a bit ! I'm fine, just thought it would be a good option instead of having to use a cool head and risk domes cracking Good lad 👍 Steve |
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