Gas ports

[308kiwi]

I can't add to the "barrel gas ports" thread because it's read only but 98 has posted a couple of charts on there recently, this is another that is a handy reference, someone that can add to that thread could perhaps attach it.  Cheers..

 

[98Z5V]

10 hours ago, 308kiwi said:

I can't add to the "barrel gas ports" thread because it's read only but 98 has posted a couple of charts on there recently, this is another that is a handy reference, someone that can add to that thread could perhaps attach it.  Cheers..

Done, brother. 

[308kiwi]

 

5 hours ago, 98Z5V said:

Done, brother. 

Thank you.

It's really interesting comparing the actual 'gain in area' increases as your port size increases, something to always consider when tuning gas ports.

[98Z5V]

18 minutes ago, 308kiwi said:

 

Thank you.

It's really interesting comparing the actual 'gain in area' increases as your port size increases, something to always consider when tuning gas ports.

That's why we have different gas port sizes for different gas block sizes.  Notice the differences in the charts I posted in the other thread?  They have two different figures, for a .625 and .750 gas blocks.  That's due to the volume of that hole.  It's simple engine math, really.  How to calculate bore and stroke into cylinder volume.

Bore x Bore x Stroke x 0.7854 = displacement, for that cylinder.

Same thing with gas ports in barrels.  Gotta know how thick that barrel is in order to get the "stroke" part of the calculation correct.