2 stroke exhaust theory used on a bbmg
Posted: Fri Jun 25, 2010 2:58 pm
Hey guys, I havent been working on any guns in a while but recently I did a bit of reading about 2 stroke exhast and how the different expansion chamber sizes and such have a huge effect on how well a bike runs. Ill attach a quick picture I drew up to help me understand what goes on better.
While this is all fascinating for a 2 stroke engineer, the main part that I found could be usefull in spudgunning is the fact that when the high pressure waves goes from a small diameter to a large diameter, it creates a low pressure wave that travels back toward the small diameter.
In a 2 stroke this serves to pull extra exhaust gases out from the cylinder but in a bbmg with a pulsed air supply I think it may help to pull other bbs toward the barrel.
While Im not sure the same effect would be achieved with simple shop air. However I think this could be investigated quite simply with a highspeed camera, and some sort of pulsed air supply. The expiriment would basically be the same as the one used by the original 2 stroke engineers. Simply cut down the barrel by small amounts until you get the best performance.
Just putting the idea out there to see what you intelligent people think and asking (jsr probably has given this quite a bit of thought) what would be a good way to make a high frequency pulse valve. I was thinking maybe something with a poppet but Im not sure.
While this is all fascinating for a 2 stroke engineer, the main part that I found could be usefull in spudgunning is the fact that when the high pressure waves goes from a small diameter to a large diameter, it creates a low pressure wave that travels back toward the small diameter.
In a 2 stroke this serves to pull extra exhaust gases out from the cylinder but in a bbmg with a pulsed air supply I think it may help to pull other bbs toward the barrel.
While Im not sure the same effect would be achieved with simple shop air. However I think this could be investigated quite simply with a highspeed camera, and some sort of pulsed air supply. The expiriment would basically be the same as the one used by the original 2 stroke engineers. Simply cut down the barrel by small amounts until you get the best performance.
Just putting the idea out there to see what you intelligent people think and asking (jsr probably has given this quite a bit of thought) what would be a good way to make a high frequency pulse valve. I was thinking maybe something with a poppet but Im not sure.