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flathead oil pressure not sure?

Discussion in 'The Hokey Ass Message Board' started by BillyBobsSpeedShop, May 26, 2013.

  1. BillyBobsSpeedShop
    Joined: Jan 6, 2008
    Posts: 522

    BillyBobsSpeedShop
    Member

    I need the HAMBs help to know if my oil pressure is normal. I have an AV8 build with a 59ab flathead that came out of an industrial welder. Before installing the motor I took the oil pan off and scraped and cleaned the sludge out and did the same under the intake manifold. There wasn't a lot of sludge like other flatheads that I have cleaned but enough. I also put a new oil pump screen on as well. Well I am running a beehive oil filter from offenhauser and am not running a full flow system. I did solder up one of the fittings on my inlet side of the oil filter and drill a .060 hole for restriction.

    So when I crank the flatty I have around 60-50lbs of oil pressure and it stays that way till the motor gets warm from driving. As I am driving it shows around 5 to 15lbs and some times a little less while driving and idling at stop signs. I did notice that the top cover on my oil filter seems to leak a little oil After the car has ran and got warm. The oil filter isn't mounted vertically but has a slight kick pack to it due to it being mounted on a 1929 ford firewall. Could this leaking oil filter be any of my problem? Its not leaking a lot but is noticeable and not sure if it leaked every time. I am running 20w-50 valvoline racing oil that has the zinc in it and probably have drove the car a total of 10 miles since it has been done. I also put 5 qts of oil in the engine 4.25 QTS in the engine and .75 QTS in the oil filter.

    Does any of this sound out of place or is this oil pressure normal for a flatty?
     
    Last edited: May 26, 2013
  2. slowforty
    Joined: Mar 7, 2005
    Posts: 743

    slowforty
    Member

    It is probably ok
    Mine has less oil pressure than yours, but my motor is in worse shape.
    An important amount of oil pressure with Flat heads is Some.

    All the Best,
    Yours for Longer Hoods,
    Roger
     
  3. 3blapcam
    Joined: Jul 15, 2004
    Posts: 526

    3blapcam
    Member
    from Austin, TX

    My 8ba runs around 15psi when it's hot. Yours seems low @ 5psi with a fresh build. Did you check bearing tolerance? (I really don't know much about 59ab tolerances, but that has a lot to do with oil pressure).

    I doubt the oil filter leak has anything to do with it... unless it's a gusher!!!

    3ball.
     
  4. Just keep driving it!:cool: It's a Flathead:eek:
     

  5. Ole don
    Joined: Dec 16, 2005
    Posts: 2,915

    Ole don
    Member

    3 to 5 at hot slow idle is OK, most run 15 to 40 down the road at 1800 to 2200 RPM's hot. Less and you may wish to put in new bearings.
     
  6. Saxon
    Joined: Aug 9, 2008
    Posts: 2,157

    Saxon
    Member
    from MN

  7. BillyBobsSpeedShop
    Joined: Jan 6, 2008
    Posts: 522

    BillyBobsSpeedShop
    Member

    It isn't a new rebuild
     
  8. JohnEvans
    Joined: Apr 13, 2008
    Posts: 4,883

    JohnEvans
    Member
    from Phoenix AZ

    Sounds like a worn Flattie,time for bearings.
     
  9. flatjack
    Joined: Feb 13, 2007
    Posts: 941

    flatjack
    Member

    What kind of gauge are you using and have you checked it with another gauge?
     
  10. BillyBobsSpeedShop
    Joined: Jan 6, 2008
    Posts: 522

    BillyBobsSpeedShop
    Member

    I'm using an auto meter gauge and I haven't checked it with another gauge yet.
     
  11. 296 V8
    Joined: Sep 17, 2003
    Posts: 4,666

    296 V8
    BANNED
    from Nor~Cal

    Its about normal …. they bleed of a bunch of presser at the cam bearings.
     
  12. 40FordGuy
    Joined: Mar 24, 2008
    Posts: 2,907

    40FordGuy
    Member

    Ditto what John Evans said....Fresh bearings will make a difference. Worn cam bearings will drop the o.p. too.

    An old Ford shop manual reads "25 psi @ 30 mph".

    4TTRUK
     
  13. no55mad
    Joined: Dec 15, 2006
    Posts: 1,891

    no55mad
    Member

    59ab runs ~20psi when hot going down the road and it is a fairly fresh motor. Try some 'Power Punch' (added to 40 wt oil) - will make it run a little higher PSI + protect the cam and other internals.
     
  14. Truckedup
    Joined: Jul 25, 2006
    Posts: 4,200

    Truckedup
    Member

    I assume you mean bleeding off even with new bearings? If so what's the fix?
     
  15. BillyBobsSpeedShop
    Joined: Jan 6, 2008
    Posts: 522

    BillyBobsSpeedShop
    Member

    So should I change my oil to a heavier weight? Also what is power punch?
     
  16. 296 V8
    Joined: Sep 17, 2003
    Posts: 4,666

    296 V8
    BANNED
    from Nor~Cal

    Yes even when all fresh and new.
    If you look at how the V8’s oiled oil is pumped to the cam and routed to the bottom end from there….except for the rear main.

    A friend of mine has had custom cam bearing made that have a single oil hole…to oil the cam.
    He cuts oil passages groves in the block to route the oil around the cam bearing instead of around the groves in the cam shaft.
    The result has been more oil and presser at the mains and rods … and overall.
     
    Last edited: May 27, 2013
  17. Truckedup
    Joined: Jul 25, 2006
    Posts: 4,200

    Truckedup
    Member

    Ok,that's just like the oiling in 100 million SBC's...........
     
  18. Flat Ernie
    Joined: Jun 5, 2002
    Posts: 8,406

    Flat Ernie
    Tech Editor

    Since it's a 59AB, pull the intake off again. Then unscrew the oil pressure relief plug at the front of the lifter valley. Take out the spring and check ball and clean this area out well. Put it all back together and if you want a wee bit more pressure put a washer or shim under the plug cap. Don't overdo it, maybe 1/8" or so.

    I also prefer Diesel oils - not for the zinc necessarily, but their additive packages seem to hold hot oil pressure better. I had been running 20W50 automotive oil in my old flatty and would register near zero at hot idle and 15-20 running down the road. Switching to 10W40 Shell Rotella or Mobil Delovac and I have 5-7 at hot idle and 20-25 running down the road. I even tried switching back just to see if something had changed in the engine - nope - same results.

    They're happy enough at those pressures, so don't let it worry you too much. It's hard not to though! ;)
     
  19. 296 V8
    Joined: Sep 17, 2003
    Posts: 4,666

    296 V8
    BANNED
    from Nor~Cal

    You asked … I answered and no the two are not the same
     
  20. So-Cal Speed Sacramento
    Joined: Sep 6, 2008
    Posts: 463

    So-Cal Speed Sacramento
    Alliance Vendor
    from Sacramento

    it doesn't sound too far off- just old and worn.
     
  21. no55mad
    Joined: Dec 15, 2006
    Posts: 1,891

    no55mad
    Member

    Power Punch is an oil additive. The company has been around since 1953. Google it and you can find a distributor or buy online. They have a techline too - good people that will talk to you. Encouraged them to become an Alliance Vendor here.
    Note: See the PP related site/info below.

    http://pnsca.com/2010/04/power-punch-returns-as-title-sponsor/

    POWER PUNCH

    *
    POWER PUNCH OIL SUPPLEMENTS

    POWER PUNCH OIL SUPPLEMENTS use the latest in Petroleum Polymer technology to increase the film strength of any oil. This stronger oil film is much harder to penetrate under load and heat and therefore prevents metal-to-metal contact, which causes wear, heat and wasted horsepower. Less wear and heat means much longer life for both the equipment and the oil. The high strength oil film also cushions the metal parts to provide quieter operation because shock loads are dampened. POWER PUNCH also stabilizes the viscosity of oil during high load or temperature operation to prevent breakdown and the creation of sludge.

    POWER PUNCH used in an engine provides a better surface for sealing of piston rings and therefore more power available at the crankshaft. Higher compression, less contamination and lower heat all lead to more power, greater efficiency and lower emissions. Contamination of the oil by combustion products is also significantly reduced and this gives cleaner and longer lasting oil.
    When you first start your engine all the oil is in the oil pan - unless you use POWER PUNCH! With the famous POWER PUNCH clinging power a protective film of oil remains adhered to your engine's critical parts - even if it sits for a long time. This film provides corrosion protection until you start your engine and lubrication until your engine's oil pressure is established.

    In any type of equipment, prevention of oil leaks depends upon flexible seals as well as the film strength of the oil. POWER PUNCH keeps seals pliable and it's stronger film assists in keeping your garage floor clean and the oil where it should be … in your equipment. Less oil lost is money saved.

    Hydraulic systems such as those in tractors, lift systems, automatic transmissions and power steering can also benefit from the qualities of POWER PUNCH. Adding approximately 10% POWER PUNCH will provide cooler operation, less wear, smoother control and control leaks. Substantially longer equipment life can result with less maintenance necessary and down time.
     
    Last edited: May 29, 2013
  22. Some Good info here on an Age old problem. I've heard it a hundred times. A guy feels he can rebuild his Flat Motor so he does Rings, Bearings and pokes a New race cam in it with adjustable lifters. The valves looked good (enough) being they are a lot of work for the Home Mechanic. Runs grate except It didn't fix my Low oil pressure. Cam Bearings? Why would I change those?
    It's like hearing a Pattsy Cline song, still sounds the same no matter how many times you hear it.
    The Wizzard
     
  23. ChuckleHead_Al
    Joined: Mar 29, 2004
    Posts: 1,914

    ChuckleHead_Al
    Member

    Just curious, did any of you change your oil pump and screen? They have a high flow pump @ 80lbs and a regular flow @ 50lbs of pressure?
     

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