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Piston sliding room
Posted: Fri Dec 14, 2007 4:56 pm
by pat123
I have been working on a piston for about a month now. I am almost finished all I need to know is how much room does the piston need to slide back, about and inch? i'll post pictures when it is finished.
thanks
Pat
Posted: Fri Dec 14, 2007 5:04 pm
by DYI
For a coaxial, the piston should have a stroke roughly equal to 1/4 x barrel porting ID. For a barrel sealer, it can have a bit more travel than that, probably 1/2 barrel ID or so.
Posted: Fri Dec 14, 2007 5:07 pm
by pat123
thanks this is my first piston. the port is 1.5 in so I'll make it 3/4inch
Posted: Fri Dec 14, 2007 5:08 pm
by MrCrowley
Depends on the I.D of the barrel.
In a co-axial the piston should slide back 1/4 of the barrels diameter.
In a barrel sealer I would say the barrels diameter as a max slide back distance. So if you had a 40mm(1.5") barrel, I would say 40mm maximum and probably 20mm(3/4") minimum.
It doesn't really increase performance a lot in bigger bore guns as long as you keep the pilot volume to a minimum and have a decent pilot valve.
Damn, DYI beat me to it
