Rebuild or another season...460 BBF
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Rebuild or another season...460 BBF

  1. #1
    tintingsandiego krusn56's Avatar
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    Default Rebuild or another season...460 BBF

    I have a mild 460 and was thinking its time for rebuild. When I first fire up its getting 50lbs oil pressure. After I get a cruise at 3500-4000 rmp(oil stays at 40lbs always cruising) and go to idle oil pressure drops to 25lbs as well the temp 20-30 degrees increase. I will set at idle and the temp starts to come back down as well the oil pressure increase to 35-40lbs. My compression reads about 140 give or take a few lbs slightly warmed up. I get a little residue on my transom but I run mystery oil in my gas. I do run a wiks oil filter and 20/50w val racing with one qt of lucas. I have a ten qt basset pan. Any suggestions? I dont want to put a chevy or olds in...just had to say that
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    Boat Nut sleekcrafter's Avatar
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    Too much oil in the pan, drop two qts and run it again. If and when it gets into the windage, the oil starts foaming. Try the lower oil level and see whats happening, if oil pressure stays up, you have windage issues, if it's the same, you have deeper issues.
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    That doesnt sound all the bad. My ford starts at 80cold. When it warms up it holds at 45-50 wot and at idle it holds at 15-20.

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    tintingsandiego krusn56's Avatar
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    Its a 10qt pan and I have 9qts of 20/50w with 1qt of lucas. I have been running it this way for years. I have never seen any milky or condensation residue. Windage tray? So if theres a issue with it, would that cause my first post?
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    tintingsandiego krusn56's Avatar
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    Quote Originally Posted by Fo Sitty View Post
    That doesnt sound all the bad. My ford starts at 80cold. When it warms up it holds at 45-50 wot and at idle it holds at 15-20.
    Does it come back up after you idle for a bit? What water temp do you run at?
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    www.highflowdynamics.com LakesOnly's Avatar
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    Quote Originally Posted by krusn56 View Post
    I have a mild 460 and was thinking its time for rebuild. ...first fire up its getting 50lbs oil pressure....cruise at 3500-4000 rpm (oil stays at 40lbs always cruising) and go to idle oil pressure drops to 25lbs...I will set at idle and temp starts to come back down as well the oil pressure increase to 35-40lbs. My compression reads about 140 give or take a few lbs slightly warmed up. Any suggestions?
    There is nothing you have described that indicates a need for an overhaul. On the contrary, the oil pressure sounds typical as does its behavior, and if you have 140 (+/-) pounds cylinder pressure (warm) on all 8 cylinders then that's pretty healthy.

    25-35 idle pressure is just fine. If you want more than 40-50 psi at cruise you might add a shim kit to the oil pump (increases peak pressure) but frankly your preussure readings are not a red flag nor do I think they justify pulling the engine & pan just to shim-up for 10 pounds or so. My jet 460 boat runs 41 psi at 5200 all day long without issue.

    If anything just give it a good tune-up.

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  9. #7
    tintingsandiego krusn56's Avatar
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    Quote Originally Posted by LakesOnly View Post
    There is nothing you have described that indicates a need for an overhaul. On the contrary, the oil pressure sounds typical as does its behavior, and if you have 140 (+/-) pounds cylinder pressure (warm) on all 8 cylinders then that's pretty healthy.

    25-35 idle pressure is just fine. If you want more than 40-50 psi at cruise you might add a shim kit to the oil pump (increases peak pressure) but frankly your preussure readings are not a red flag nor do I think they justify pulling the engine & pan just to shim-up for 10 pounds or so. My jet 460 boat runs 41 psi at 5200 all day long without issue.

    If anything just give it a good tune-up.

    LO
    I have a back up 460 in my garage but needs a build....I want to enjoy what I have and keep the x-tra cash for river trips. Thanx for info lakesonly
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    www.highflowdynamics.com LakesOnly's Avatar
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    Run your boat the way it is and take as much time as you want collecting parts/building the back-up engine for use sometime well in the future....

    LO
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    Performance Components for the 429/460 Engine Family


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    Ralphs club member LSXINDUSTRIES's Avatar
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    My 460 only has 34lbs @ 4400 Rpm, and 15lbs @ idle when hot.....but its been this way for years and years. I've always been concerned about the pressure, but the oil looks good and it dosen't really burn any either. I know the pressure is on the lower side of what id like to see, but it has consistently been this way for so long and been very reliable. Every winter i get the itch to yank the motor and pop the main caps, but i never do. This winter the LQ9 is going in, so ill finally tear it down once its out and see how it looks.
    “I am on a drug. It’s called Charlie Sheen. It’s not available because if you try it, you will die. Your face will melt off, and your children will weep over your exploded body.”



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    Quote Originally Posted by krusn56 View Post
    Does it come back up after you idle for a bit? What water temp do you run at?
    After idle and yes. I run the boat at 150 at idle and it drops to 105-110 wot

  13. #11
    Boat Nut sleekcrafter's Avatar
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    There is a miss conception that just because the it's a 12qt ot it's a 10qt pan. that it gets 12 qts or 10qts respectively. The true full volume, or capacity, should be determined by oil level respective, to the rotating assembly. This vary in each application, depending on motor angle. Jet boat motors sit at 4-5 degrees or more, tilting the motor with the advertised capacity can lead to submerging the crankshaft in oil. If you are happy with the way your boats is will oil pressure leave it be, if you would like to try to find the root of the problem, it costs nothing to try. Motors running in the 3000 plus range for extended periods, may experience fluxutation in oil pressures, windge airrates the oil, reducing heat tranfer and loss of pressure.
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    LAKES ONLY helped me on my bbf 460. great guy and knows his stuff. he made mine run like a champ. thanks dude

  15. #13
    www.highflowdynamics.com LakesOnly's Avatar
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    Always happy to help, sangerfan76.

    LO
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    Performance Components for the 429/460 Engine Family


    This post © Copyright 2007-2017 Paul Kane. No copying, linking, printing or otherwise without express written permission.

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