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Chrysler Hemi oil filter advice

Discussion in 'The Hokey Ass Message Board' started by 1932tub, Feb 12, 2011.

  1. 1932tub
    Joined: May 31, 2005
    Posts: 420

    1932tub
    Member

    I am installing a remote filter to a 354 Hemi, the adaptor plate is tapped for 3/8 bsp. Would 3/8 tube be a big enough bore to carry the oil to and from the filter?
    Its not a race engine will only be street driven.
    There is no room to mount a filter to the block even with an adapter.
     
  2. George
    Joined: Jan 1, 2005
    Posts: 7,999

    George
    Member

    If it wasn't, the maker would probably been sued out of business by now....:)
     
  3. 1932tub
    Joined: May 31, 2005
    Posts: 420

    1932tub
    Member

    Thanks for your reply George, forgot to mention that the adapter was hand made, nothing factory.
     
  4. Mopar'd
    Joined: Sep 5, 2006
    Posts: 47

    Mopar'd
    Member

    On my desoto (330) I run a 3/8" I'd hydraulic line. On my 354 I am running a 1/2" line. My thoughts were that I was a little worried about all of the mods that I made in the motor. Could you explain your build of the engine?
     
  5. Pir8Darryl
    Joined: Jan 9, 2008
    Posts: 2,487

    Pir8Darryl
    Member

    What's the size of the pickup tube on the oil pump?
    I'm betting it's 1/2", and I'd advise using at least that size... Unless the early hemi is an internal byp*** engine.

    Let me put it to you this way... Check out this thread:
    http://www.jalopyjournal.com/forum/showthread.php?t=297383
    A small block chevy oil pump that's converted to a hand held utility pump. Spinning at 1000 RPM, it moves 4-5 gallons per minute.

    Now the oil pump is cam driven, so it only spins at 1/2 engine RPM, but all the same, at 2000 rpm, it's moving 4 gallons per minute. At 4000 rpm, it'sa moving 8 gallons per minute. Think about what it would take to push 8 gallons per minute thru a 3/8 line... :eek:

    All in all, I think a 3/8 line is just asking for trouble.
     
  6. 73RR
    Joined: Jan 29, 2007
    Posts: 7,342

    73RR
    Member

    '-8' minimum.

    ...and the longer the lines the bigger the 'hole'...cold oil (and bearings) will not like the 3/8.

    .
     
  7. Mopar'd
    Joined: Sep 5, 2006
    Posts: 47

    Mopar'd
    Member

    I thought I would do some calculations on th pressure losses an velocity of oil through the different tubing sizes. (cammeron hydraulic data book)
    all calculations use 4 tpm as the base flow and 30 w oil @ 100 F
    For 3/8" tubing:
    Velocity of the 10.1 ft/s. Loss of psi in 100ft= 50.6 psi
    For 1/2" tubing :
    Velocity = 5.87 ft/s. Loss of psi per 100 ft = 13.8 psi
    For 5/8" tubing :
    velocity= 3.84 ft/s. Loss of psi per 100 ft = 1.66 psi

    with this data you can calculate your losses and determine if it might be a problem. My hoses are a total of 7'. So multiply the pressure loss by .07. In 3/8" tubing a loss of 3.5 psi ; 1/2" would yield .96 psi and with 5/8" = .112 psi.

    I know to much info, but it should show you that the numbers are very small .
     
  8. 1932tub
    Joined: May 31, 2005
    Posts: 420

    1932tub
    Member

    Thanks for the info guys 1/2" tube it is
     
  9. Pir8Darryl
    Joined: Jan 9, 2008
    Posts: 2,487

    Pir8Darryl
    Member

    Samrt move :D

    Mopar'd,
    What's the value for "t"? Did you mean "g"?
     

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