Piston ring fundamentals

[Pontual]

2 x 3,1416 (Pi) x r,
Not, 6+ times ...

 

[friendly_jacek]

page 71:

Quote:
Note: In some countries the oil is filtered through cloths and then resold.

 

[Shannow]

Originally Posted By: Pontual
2 x 3,1416 (Pi) x r,
Not, 6+ times ...


delta Circumference = 2*pi X delta R

delta R = film thickness

therefore gap closes 6.2832 times the delta in film thickness.

 

[MolaKule]

Circumference = π × diameter = 2 × π × radius. The circumference of a circle is the distance around it.

/\ is delta or change.

/\ Circumference = pi X /\ Diameter = 2 X π X /\ Radius.

A related topic can be found here:
Oil film thickness

A google search also found these possibilities wrt to ring friction:

Piston ring friction.

Lots of good reading here.

 

[carock]

Wow. That is really a great article on piston rings. Thanks for posting this and providing the link.

 

[Pontual]

Ah, THE DELTA: it is the difference between the max oil film tickness and minimum oil film tickness. So the ring closing its gap 6,28 times the Delta of film tickness. Now, If the (distance or thickness) between the bore and ring gap changes 1 micron, the gap on the ring tips will close 6,28 microns.

Now I've got what Jetronic was trying to say ...

Thanks!

 

[friendly_jacek]

Originally Posted By: carock
Wow. That is really a great article on piston rings. Thanks for posting this and providing the link.


not bad indeed. i wish they talked more on the low tension rings that are all the rage now.