« previous next »
Pages: [1]   Go Down

Author Topic: Tank vent size.  (Read 5183 times)

Offline BK

  • Sr. Member
  • ****
  • Posts: 310
    • View Profile
  • Your Best Time: 8.45 / 5.30
  • Your Track: Empire Dagway
  • Your Vehicle: Late 70's FED
Tank vent size.
« on: April 04, 2016, 06:21:28 PM »
 Checking for a friend. Wondering what size the tank vent should be for 1200HP.
Logged

dreracecar

  • Guest
Re: Tank vent size.
« Reply #1 on: April 05, 2016, 08:42:43 AM »
If the tank is finnished, remove tank and take it outside and cap all the inlets and outlets except for vent. Fill to the top with water and close fill cap. Remove main line cap and watch water flow, it should be a constant streem, if it surges (like an old man peeing) then the vent is too small.

 I ran a 5gal tank with a 7/8" dia feed tube to a 110 pump SBC blown in 7.0pro and used a 1/2" dia vent line front to back and a "T" in the middle and then forward, venting was never an issue
Logged

Offline Rusty Kramer

  • Newbie
  • *
  • Posts: 26
    • View Profile
  • Your Best Time: 3.90 @ 185mph 1/8 Mile
  • Your Engine: 472CID KB Olds Blown alky 14-71 HH
  • Your Track: Eddyville Raceway Park Eddyville, Iowa
  • Your Vehicle: Self Build Rear Engine BA/D
  • General Location: Midwest
Re: Tank vent size.
« Reply #2 on: April 05, 2016, 10:42:52 AM »
We are feeding a little more motor but 1-1/8" ID feed line.  3/4" ID vent.  Pee test like a young guy and works good on the car. same type vent as DREracecar has front and rear vent with a T in the center
Logged

Offline masracingtd1167

  • Hero Member
  • *****
  • Posts: 1110
  • bill masiello Shelton Ct.
    • View Profile
  • Your Best Time: 7.40's at 181 on motor 6.94 at 192 nitrous
  • Your Engine: 394 chevy
  • Your Track: Lebanon Valley Dragway
  • Your Vehicle: 2003 Neil and Parks
Re: Tank vent size.
« Reply #3 on: April 05, 2016, 12:20:22 PM »
Quote from: dreracecar on April 05, 2016, 08:42:43 AM
If the tank is finnished, remove tank and take it outside and cap all the inlets and outlets except for vent. Fill to the top with water and close fill cap. Remove main line cap and watch water flow, it should be a constant streem, if it surges (like an old man peeing) then the vent is too small.

 I ran a 5gal tank with a 7/8" dia feed tube to a 110 pump SBC blown in 7.0pro and used a 1/2" dia vent line front to back and a "T" in the middle and then forward, venting was never an issue
     Like an old man peeing ! Funny stuff ! Just remember after you turn 60 never pass a bathroom and never trust a fart !
Logged

Offline hotrod316

  • Sr. Member
  • ****
  • Posts: 352
    • View Profile
Re: Tank vent size.
« Reply #4 on: April 06, 2016, 05:37:50 AM »
there is one more 8)
Logged

Offline Spud Miller

  • Global Moderator
  • Sr. Member
  • *****
  • Posts: 332
    • View Profile
    • Fuel Injection Ent., LLC
Re: Tank vent size.
« Reply #5 on: April 10, 2016, 09:09:18 AM »
Logged

Fuel Injection Enterprises, LLC
     Mechanical Injection
     Magnetos
     EFI Conversions

dreracecar

  • Guest
Re: Tank vent size.
« Reply #6 on: April 10, 2016, 06:44:48 PM »
Two things I might add to your "perfect tank"
One is that the aluminum to use is 5052H32, this is a marine grade and holds up to corrosion better than others
Two is that there's problems with anodizing alu. As it's hard to repair cracks or add on to without complete chem strip on both the inner and outer surfaces. If these areas are not clean raw alu, then the weld is contaminated and a poor weld..I ran a raw tank for 20 years without issues, just drain it after the weekend
Logged
Pages: [1]   Go Up
« previous next »