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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


 
 
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Old 02-12-2009, 09:27 PM
Treesmacker Treesmacker is offline
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Join Date: Aug 2006
Location: MN
Posts: 82
Default Cyl/Head o-rings why so small

My question is why are the cylinder o-rings on the GasGas undersized compared to the o-ring groove?? They need to be stretched alot to fit into the groove, resulting in a smaller cross section. Are they undersized for thermal expansion?? http://catalog.precisionassoc.com/pr...lication-data?

I'm a mold designer and spec out o-ring grooves all the time.
When we size a o-ring groove we match either the outside or inside of the o-ring to the groove, depending on if it has internal or external pressure. The groove is designed so that the o-ring protrudes above the surface but is wide
enough to accomadate the o-rings cross sectional area.
Bob in MN
2 weeks till the Wudi!
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