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Joined: Thu Apr 12, 2012 5:33 pm
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Vehicle: 1990 wt sierra

Post Posted: Fri Dec 21, 2012 8:08 am 
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Just want to know off those who have snorkels would 50mm ID stainless tube be to small for a snorkel?

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Post Posted: Fri Dec 21, 2012 8:43 am 
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Thats a matter of opinion really. Personally, I'd be looking at 2.5" (63mm) atleast. I only use 3" (75mm) for snorkels.

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Post Posted: Fri Dec 21, 2012 10:53 am 
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X2.

I think 2" might be a bit small - there's a fair length that will increase frictional loss, and 2" is hard to find a ram duct/precleaner for.

I only make snorkels in 3"

Steve.

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Post Posted: Fri Dec 21, 2012 3:50 pm 
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My snorkel is 3inch and looks a treat, has a 2.25inch tip as a 3inch inlet on a ram head will be way to big for a little sierra engine.

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Post Posted: Fri Dec 21, 2012 4:08 pm 
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Correct me if im wrong but you would want as close size to whatever the opening of the carby/intake as you chould?

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Post Posted: Fri Dec 21, 2012 5:48 pm 
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sando wrote:
My snorkel is 3inch and looks a treat, has a 2.25inch tip as a 3inch inlet on a ram head will be way to big for a little sierra engine.


Sorry? How do you figure that?

Steve.

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Post Posted: Fri Dec 21, 2012 5:53 pm 
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Steve just realised what I wrote, I ment pre-cleaner not ram head. When I looked at pre-cleaner sizes the ones with three inch inlet were to large for the amount of air the sierra could use.

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Post Posted: Sat Dec 22, 2012 6:51 am 
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Ah yes, that does make sense.

Steve.

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Post Posted: Sat Dec 22, 2012 3:41 pm 
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ok thanks thought it might of been bit small its just i have a heap of it at work looks like ill have to buy some

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Post Posted: Mon Dec 24, 2012 7:21 pm 
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douglasgiersch wrote:
Correct me if im wrong but you would want as close size to whatever the opening of the carby/intake as you chould?


I would like to know also

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Post Posted: Mon Dec 24, 2012 8:06 pm 
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Its due to the extra surface resistance of the pipework itself over the length of the longer pipe adding up, its more significant than you would guess,
I remeber doing the math in high school physics, but I would have to google it nowadays.

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Post Posted: Mon Dec 24, 2012 8:14 pm 
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http://www.pipeflowcalculations.com/pressuredrop/
Pressure drop is calculated for known flow rate, pipe diameter, pipe length, fluid density and viscosity.
For flow rate calculation, pressure on the start and on the end of pipe is required, as well as pipe diameter, pipe length, fluid density and viscosity.
Pressure drop in pipe calculation is based on the Darcy-Weisbach equation for head loss due to friction in closed round or rectangle pipe.

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