halfinchlivesteamforum : Message: O ring query

I recall somewhere seeing a 'limits and fit' table for O rings?

Assuming a 1/16" O ring, if I wanted an, ID of 0.25" what depth and diameter
spotface cutting would I require?

Again if the OD was the critical factor of 0.25" what would the ID have to be?

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I recall somewhere seeing a 'limits and fit' table for O rings? Assuming a 1/16" O ring, if I wanted an, ID of 0.25" what depth and diameter spotface cutting...

david_steam

May 26, 2009
7:53 am

Hi David, have a look at: http://www.barnwell.co.uk/pdf/O%20Rings.pdf That has all the info for sizing grooves etc for O rings. I don't know what you will be...

John Baguley
jbaggo

May 26, 2009
11:09 am

A rough figure is to 'assume' the o ring is 0.0625 dia which it isn't, a 1/16" o ring is 0.070" section so you get a bit of nip. Basically I adjust to suit...

Simon Wass
simonwass

May 26, 2009
12:35 pm

Also remember the "rubber" or elastic material of an O ring is not compressable like convential packing. So the cut out for the ring must be wide enough to...

John
olewilly2000

May 27, 2009
7:19 am

Your experience of using o rings is totally opposite to that I experience. I only use red or white silicone rings and they have quite a good stretch and ...

Simon Wass
simonwass

May 27, 2009
12:41 pm

Ok I will come clean, its for a Royal Enfield 250 cc engine. The two crankcase halves have a 3/16 passage for (I think a low pressure return) are just butted...

david_steam

May 28, 2009
9:25 pm

Hi David, You're only looking at a simple low pressure static seal so as long as the O ring is compressed when the 2 halves are bolted together you shouldn't...

John Baguley
jbaggo

May 28, 2009
11:49 pm

What is it, an oil return? Not sure on material, you can get cheap natural rubber rings, or silicone, or viton. The cheap rubber ones are better with oils than...

Simon Wass
simonwass

May 29, 2009
12:03 am

hallo David nice bike haven't been on one of those since i was a nipper if your crank-case is good i.e. not warped not really necessary , no science in...

Charles Mortimer
g1fak

May 29, 2009
2:14 am

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