A better oil?
+ Reply to Thread
Results 1 to 13 of 13

Thread:
A better oil?

  1. #1
    History Repeating Storz's Avatar
    Join Date
    Nov 2008
    Location
    Fuquay-Varina, NC
    Posts
    596

    Default A better oil?

    For the life of my boat it has always been run on Valvoline 20w50, its what my old man used when he first bought it back in the day and its what I ran all last year. However if I run it WOT for around a minute or so the oil pressure starts seriously dropping and it's not until I either idle or shutdown for a little bit before it comes back up.

    Oil pump is a high flow pump, standard oil pan.

    Any recommendations for an oil that can handle the sustained RPMs a bit better to keep the pressure up? Or is it just a matter of bite the bullet and buy a bigger oil pan...
    '84 Laser LTV - Restoration in progress
    '77 Caribbean

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member YumaJet's Avatar
    Join Date
    Sep 2008
    Location
    Yuma, Az
    Posts
    829

    Default

    what kind of oil filter are you using? i use vr20w50 and my oil pressure is constant and does not drop. with a fram it stays above 65psi and when i used a k&n the pressure was around 73. my rpm's are usually above 5k. what do you mean of using a standard pan? if its a stock pan, it might not give it the proper flow.
    boatless....

  4. #3
    Senior Member YumaJet's Avatar
    Join Date
    Sep 2008
    Location
    Yuma, Az
    Posts
    829

    Default

    Quote Originally Posted by Storz View Post
    Or is it just a matter of bite the bullet and buy a bigger oil pan...
    this is from ars marine:

    Ars Marine - Marine Jet Boat Engine Parts
    Jet Boat Oil Pan

    JET DRIVE oil pan** Designed for jet drive boats, all-out racing, as well as skiing and recreational uses. Built from super heavy duty 16 gauge steel to withstand all types of abuse and severe racing conditions. Designed with ample bilge clearance in mind. This pan comes equipped with a full length windage tray and a double trap door system which provides complete oil control yielding increased power, reduced oil temperatures and consistent oil supply and pressure. Pan will fit up to 4 1/2" stroke without modification, with most aluminum rods. High oil capacity is required due to the high loads placed on the engine by a jet drive and the resulting engine killing high oil temperatures. Features a water-tight, screw-in dipstick which does not allow bilge water to enter the pan and contaminate the oil. ~~Pan Capacity is 10 Quarts~~ Plus Filter. 7 1/2" Deep Sump, Front and Rear, *** BIG BLOCK CHEVY 396-454 Mark IV ('65-'90) ***
    boatless....

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    History Repeating Storz's Avatar
    Join Date
    Nov 2008
    Location
    Fuquay-Varina, NC
    Posts
    596

    Default

    Quote Originally Posted by YumaJet View Post
    what kind of oil filter are you using? i use vr20w50 and my oil pressure is constant and does not drop. with a fram it stays above 65psi and when i used a k&n the pressure was around 73. my rpm's are usually above 5k. what do you mean of using a standard pan? if its a stock pan, it might not give it the proper flow.
    Yeah it's whatever pan came with the Hardin BBF package back in the late 70s.

    Prob run this pain the rest of the year and change it out next winter.
    '84 Laser LTV - Restoration in progress
    '77 Caribbean

  7. #5
    Senior Member
    Join Date
    Dec 2009
    Location
    Northern Indiana
    Posts
    132

    Default

    There are a couple of things you might look at. Is the oil making it back to the pan and if not is the pump is sucking some air? Are the oil temps gettin hot enough to cause the oil pressure drop? Is it possible the oil level is too high and you are areating the oil and causing oil pressue to drop. I ran same oil last year and saw same issues after running at high Rpms but took more than just a minute for pressure to drop. More like 10 minutes. In my case with no oil cooler, temps were getting pretty high and causing the pressure to drop. Could run all day at 3,500 Rpm but at 4,500 and above would see the pressure begin to drop. Do not think it was the oil itself. May want to try straight 50W but be sure to allow the oil to come up to temp before playing race boat. There are a lot of folks on the forum running thinner synthetics but I am guessing they also have oil coolers on the boats.

  8. #6
    Senior Member Fonz69's Avatar
    Join Date
    Jan 2008
    Location
    Frozen Tundra, WI
    Posts
    620

    Default

    So if I read your post correct your boat did not have this problem before right?

    If there was no problem before look to what you changed since then, filter, amount of oil,.....


    For one I would get a jet boat oil pan and is it a high flow? or high volume pump (HV)

    If its a HV you do not need it and a standard pump will work great, because at sustained rpm's that pump will pump more oil then needed to quickly to the top of the motor.

    Check the filter if its a different brand, size or number, some have a anti drainback valve and some do not.

    I had a 460 in a 18' maverick back in the day and I ran 20-50 with a standard oil pump and it worked great.

  9. #7
    History Repeating Storz's Avatar
    Join Date
    Nov 2008
    Location
    Fuquay-Varina, NC
    Posts
    596

    Default

    I actually don't know if it's a new issue or not. My father gave me the boat and while he is the original owner, he never ran it hard at all. Oil/filter always used the same stuff since new.

    I should add that at all but ling WOT runs it's totally fine. Too close to summer now to mess with a new pan, it's a cruiser anyways
    '84 Laser LTV - Restoration in progress
    '77 Caribbean

  10. #8
    AKA OhOneWS6 Last Mohican's Avatar
    Join Date
    Jun 2009
    Location
    Dallas, TX
    Posts
    2,637

    Default

    What is the actual oil pressure after a long WOT run? How long at WOT? What RPM? Are you sure the pressure gauge is accurate? Do you have an oil temp gauge?

    You may be thinking there is a problem when there actually is not one. If there is an issue it may be a temp issue and not a volume of oil issue. An oil cooler may help you more than a different pan. You may also be a the point in the life of the motor that is is just loose and needs to be rebuilt or at least new bearing inserts.

  11. #9
    tintingsandiego krusn56's Avatar
    Join Date
    Oct 2008
    Location
    San Diego
    Posts
    1,063

    Default

    I asked this a while back.....I run a 460 with 10qt bassett pan. 9qts val20/50 and 1qt lucas wix filter. I would cruise for a while then go to idle and oil would drop from 40/50 to 25. I sit at idle for a couple mins and oil pressure would go back up. Has been doing this for years. I just replaced my intake gasket as the whole thing was leaking. Running slightly lean on 6 and worse on 2. I havn't ran it at the river yet to see if it helped with the oil cooling...but I'm sure it did. I also run logs/snails with gate wide open.
    Made In The Shade

    Custom Window Tinting

  12. #10
    Senior Member zacho!'s Avatar
    Join Date
    Jun 2009
    Location
    tucson, Arizona
    Posts
    979

    Default

    My original Hardin electric OP gauge read 75-80. Just switched to Autometer mech. gauge, reads 40 to 45, depending. 460 with good parts and straight 50 Brad Penn, FWTW.

  13. #11
    Senior Member
    Join Date
    Sep 2008
    Location
    OC, CA
    Posts
    273

    Default

    If its a 5qt pan that has a front oil pick-up, your running it out of oil. Its all in the top of the motor or back of the pan. If its a 10qt pan, than maybe it still has the 460 stock front oil pick-up with the same problem. Need a rear oil pick-up.

  14. #12
    Senior Member Fonz69's Avatar
    Join Date
    Jan 2008
    Location
    Frozen Tundra, WI
    Posts
    620

    Default

    How long are you running at WOT?

    If you want to run extended times at WOT you will need a bigger pan for sure.

    If its just a cruiser with the occasional 20-30 second WOT burst just leave it alone and have fun

  15. #13
    History Repeating Storz's Avatar
    Join Date
    Nov 2008
    Location
    Fuquay-Varina, NC
    Posts
    596

    Default

    Quote Originally Posted by Fonz69 View Post

    If its just a cruiser with the occasional 20-30 second WOT burst just leave it alone and have fun
    The 20-30 second blast suns it up

    Thanks for all the info, the motor is 35 years old and I am sure in need of a rebuild lol. Just going to use it and baby the motor until I can swing a full rebuild in the future.
    '84 Laser LTV - Restoration in progress
    '77 Caribbean

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95