Combustion chamber volume

[EngJW]

I was trying to figure out how the get the volume of a combustion chamber in a cylinder head, and I hit on this method:

1. Roll back the model to where the chambers were created (this removes the ports and spark plug hole).
2. Start a sketch on the head surface, select the outline of the chamber, and convert entities to add it to the sketch.
3. In the extrude box, uncheck merge and then select extrude to body.
4. Go to mass properties, select the new body, and the volume will be calculated.

It seems to work quite well, and any changes will update the chamber solid body as well.

Are there some other or easier ways?

 

[SBaugh]

Volume - is what is taught in either the Advanced part or assembly training. I can't remember which it is.

Regards,

Scott Baugh, CSWP
3DVision Technologies

http://www.3dvisiontech.com

http://www.scottjbaugh.com

faq731-376
faq559-716 - SW Fora Users

 

[macPT]

Try to use combine to subtract the cilynder head to a body that you create. You still need to create an extra body, but it can result in an easier process (easier skecth/extrude).

Don't know any other way.

Regards

 

[EngJW]

This isn't a simple volume because it is a depression in a part. You have to fill it in and then get the volume of what you add to the part. Same is cc'ing a real cylinder head.

 

[cyberpete]

I use UG but the technique should be the same.

You will need the piston and valve to accurately calculate
the volume. The valve should be seated (closed) and the piston positioned at TDC (Top dead center). The piston may travel up beyond the head gasket (bottom of the cyl head) depending on the shape of the piston and the compression ratio of the engine.

Subract the valve, head, and piston from a cyl created larger than the bore (to fill the space). The volume
of the new solid can be calculated in UG by using information - object.

This is different than calculating the CC's of the engine. That is calculated by using the bore and stroke.

visit link to calculate CC's

http://www.dunegoon.org/displacement.html

Peter
Baden, Ontario

 

[EngJW]

The problem in this case was to get the volume of the depression as opposed to the volume of the entire part, which is what SW would have calculated by default. I think the method that I used could apply to many other parts, not necessarily combustion chambers.