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Don't matter what size bag you get of the two, cuz the speed will be the same there. Speed is dependent on Line size, valve size, and PSI in the tank, and size of the tanks.

SMC 1/2" valves flow twice as fast as the 3/8" SMC's, but will only be limited by the size of line you use, 3/4" line being the most effective on a 1/2" valve, and 1/2" line being the most effective on a 3/8" valve.

One of the biggest misconceptions, or somethin like that, with n00bies is they think they won't have a fast setup. I have 3/8" everything, valves, line, and bags, and it is plenty fast for a daily driver, but of course i will be uppin to 1/2" line and 1/2" fill valves up front for a lil more speed.

my opinion... buy what you can afford... you won't be sorry either way.
 

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whats the cv of a 1/2 smc compared to the 3/8 smc. whats 3/4 line going for a foot.


what i dont get is how a npt 3/8 fitting valve side is slower than npt 3/8 fitting on bag side. would nt the flow be restricted by the id of the fitting or is it the id of the valve that is smaller than the id of the fitting?
 

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does napa carry 5/8 line?
 

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tuckinrim said:
whats the cv of a 1/2 smc compared to the 3/8 smc. whats 3/4 line going for a foot.


what i dont get is how a npt 3/8 fitting valve side is slower than npt 3/8 fitting on bag side. would nt the flow be restricted by the id of the fitting or is it the id of the valve that is smaller than the id of the fitting?
1/2" 15mm valve CV is 5.5
3/8" 10mm valve CV is 2.4

3/4" line is about $1.50 a foot... maybe a lil more.

You aren't understand how NPT fittings work. 3/8" NPT, DOES NOT mean that the diameter of the port is 3/8". 3/8" NPT port is more like 1/2" accross. The Flow diameter of a 10mm valve is .393", and the ID of 1/2" line is .376", and the flow diameter of a 1/2" tube x 3/8" NPT fitting is .338" So the restriction of less than .06" IS NOT noticeable in any way.

If you had a 1/2" NPT fittings, and 1/2" line, the SAME NUMBERS apply, because the flow diameter is the same as the 3/8" fittings, in regards to the fittings.
 

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SlammedDime said:
1/2" 15mm valve CV is 5.5
3/8" 10mm valve CV is 2.4

3/4" line is about $1.50 a foot... maybe a lil more.

You aren't understand how NPT fittings work. 3/8" NPT, DOES NOT mean that the diameter of the port is 3/8". 3/8" NPT port is more like 1/2" accross. The Flow diameter of a 10mm valve is .393", and the ID of 1/2" line is .376", and the flow diameter of a 1/2" tube x 3/8" NPT fitting is .338" So the restriction of less than .06" IS NOT noticeable in any way.

If you had a 1/2" NPT fittings, and 1/2" line, the SAME NUMBERS apply, because the flow diameter is the same as the 3/8" fittings, in regards to the fittings.
i understand that cause i recently drilled and taped my bags from 1/4npt to 3/8npt. the dia is over a 1/2".

so if i use 3/8npt bags, 5/8 line and 1/2" valves it would be faster than 3/8npt bags, 5/8 or 1/2" line and 3/8 valves due to the id of the valve.

so being 1/2 valves flow twice as much this setup should be twice as fast as 3/8npt bags, 5/8 line or 1/2 line and 3/8" valves
 

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motomullet said:
napas around me carry dot air brake line
which napa? do they have a 5/8 line?
 
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