GGDT and hammer valves

[jackssmirkingrevenge]

Had some discussion on the GTA forum and a few users modeled their hammer valve PCPs using GGDT and the predicted performance in terms of energy was much lower than measured results, with the former being in the order of only 30% of the latter. In order to approach measures results, the hammer force has to be ramped up to unrealistic levels to increase the valve opening time.

Perhaps D_Hall could comment on this, personally I don't have a lot of experience with modeling this type of valve and it would be interesting to know what factors are taken into account.

[jrrdw]

I wonder if matched porting would make up the difference?

[jackssmirkingrevenge]

I wonder if matched porting would make up the difference?

The valve parameters allow the valve seat diameter to be included, I would think that the program assumes that the transfer port to the barrel is the same diameter.

[jrrdw]

a few users modeled their hammer valve PCPs

Mass production models or home built I wonder? There would be differences in the builds.

[jackssmirkingrevenge]

Mass production models or home built I wonder? There would be differences in the builds.

Home builds with conventional valves, technically it's the same sort of design.