Re: R4GC carb rebuild tips?

Posted by DavidPackard On 2023/9/10 19:38:57
That ring detail on the piston is referred to as a labyrinth seal. In that application the groove allows the pressure to equalize around the circumference of the piston and center the piston in the bore. At constant operating clearance, more grooves result in less leakage. So, the grooves are one means to have smooth low operating force pistons while maintaining low leakage flow.

dp

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