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Old 01-07-2004, 06:49 PM   #1
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Pressure Line Length

For any type of nitro vehicle whats the advantage of running say 12" of tank pressure line vs 6" inches ?

Is there a minimum or maximum pressure line length rule that should be followed ?


Thanks....
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Old 01-07-2004, 09:54 PM   #2
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Default Re: Pressure Line Length

Quote:
Originally posted by SteveG
For any type of nitro vehicle whats the advantage of running say 12" of tank pressure line vs 6" inches ?

Is there a minimum or maximum pressure line length rule that should be followed ?


Thanks....
Steve, This is what the late Ron Paris said about it......

"Did you know the longer the fuel line coming out from the tuned pipe the leaner you can make the midrange as the engine comes up to full power?
This is caused by the delay in time it takes the fuel tank and line to reach maximum pipe pressure.
Keep in mind that this tip should be used as a fine tuning adjustment on your motor at the track.
Experiment with different lenghts, between 10 to 17 inches is normal"

Hope this helps
AFM
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Old 01-07-2004, 10:57 PM   #3
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10 to 17 inches was recommended for a 1/10? I usually use a quite a bit of line from the tank to the quad in the event of a rollover but never heard of using more on the pressure side. Very interesting.
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Old 01-08-2004, 06:46 PM   #4
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Default hold on....

As it was explained to me........and I claim to be no expert but exhaust as it leaves the cylinder is pulsed. The longer line smooths out the pulses and feeds fuel to the carb more smoothly. Something like that. 8 to 11 is good

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Old 01-08-2004, 07:01 PM   #5
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i run like a 4 inch line, is that bad?
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Old 01-08-2004, 07:08 PM   #6
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Default not at all

I mean you look in the manuals for most cars and the pics show about 3 to 4 inches. This is just stuff I've been told in the pits over the years. I read it in one of the mags as well
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Old 01-08-2004, 07:18 PM   #7
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to sum up everything, 10 inches up is good for the pressure line. how about the tube from the gas tank to the engine, will it still be the same as the pressure line?
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Old 01-08-2004, 07:21 PM   #8
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Default No!!!

In club races you'll see guys run a longer line for a bit more fuel volume or so the motor doesn't starve in the event of a roll-over but I wouldn't go much longer than say 5"
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Old 01-08-2004, 07:23 PM   #9
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i am no expert in pressure line as well but my experience is that you need a longer back pressure line for 21 class engine but I do use a much shorter line for 12 engine. about 6 to 8 inches.
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Old 01-08-2004, 07:24 PM   #10
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Default Re: No!!!

Quote:
Originally posted by hicheef
In club races you'll see guys run a longer line for a bit more fuel volume or so the motor doesn't stave in the event of a roll-over but I wouldn't go much longer than say 5"
Kevin
right, some use an additional fuel filter in between the tank and carb to extend the idling time in case of flip.
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Old 01-08-2004, 07:26 PM   #11
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Default yup yup

forgot that, got a shiny Great Planes one for that job. Excellent point
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Old 01-08-2004, 07:28 PM   #12
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Default Re: yup yup

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Originally posted by hicheef
forgot that, got a shiny Great Planes one for that job. Excellent point
oh no, you dont even forget the "bling" factor for roll over. you are getting very detailed !
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Old 01-08-2004, 07:29 PM   #13
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Talking hehehe

Just trying to help..............it is gold though
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Old 01-08-2004, 07:30 PM   #14
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Originally posted by hicheef
Just trying to help..............it is gold though
that is nice. any link for a picture of it?
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Old 01-08-2004, 07:32 PM   #15
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Default OK OK....

Now were stretchin it.
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