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I've been told that in order to make a good dmr, you should have an elongated gearbox, but I'm not sure why? What does it do?
Simple,after you have assembled the cylinderhead to the cylinder,take a piston you know will have good seal and force it into the new assembly with a finger over the air nozzle stem.If the piston stops or if you let go of it and it bounces back its good.teheelmao1 said:Now I'm more of bolt action guy, so gearbox compression is not somthing I know too much about, how would you test for air leaks?
That would be an inferior way to check compression.At best you could test the airnozzle for leaks as it would be extended as far forward as it can go.The piston would be in its furthest forward position,thus covering the airnozzle stem from the inside of the cylinder.Far better to actually employ the parts as there intended to move than resorting to static testing.headline said:Another way to test for an air seal is to but your mouth over the air nossel and blow as hard as you can, remember to have your gearbox assembled when you do this.
Alright cool, Ill take note of that. Thanks...uller said:That would be an inferior way to check compression.At best you could test the airnozzle for leaks as it would be extended as far forward as it can go.The piston would be in its furthest forward position,thus covering the airnozzle stem from the inside of the cylinder.Far better to actually employ the parts as there intended to move than resorting to static testing.headline said:Another way to test for an air seal is to but your mouth over the air nossel and blow as hard as you can, remember to have your gearbox assembled when you do this.