Oil pressure!!
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Oil pressure!!

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    Classic Hotboater CVX20's Avatar
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    Default Oil pressure!!

    Do I have a problem or what?
    I have a brand new engine 454 60 over in my jet boat. All new parts inside, rods, pistons, cam, crank all top of the linetop stuff. Has twin remote filters, oil cooler the works. Changed oil and filters after 20 min 2000 RPM break in. It held 60 to 65 pounds pressure during break in at 150 water temp. Then I ran the boat to 1.9 hrs with a few hard passes and changed everything again.Oil looked ok after that and the pressure seemed to stay rather high in that first 1.9 Hrs. Ran boat last weekend up to 4.0 hrs made a few hard passes then pulled filters and drained the oil out of them into a clear container, looks OK to me. Will be cutting the filters open in the morning to look at the elements. The change in pressure is starting to bother me, I don't want to hurt this new motor. When you fire it up now it's 50 lbs at 900 RPM goes up to 60 or 70 at 3000 RPM. then when you run the boat hard 5300 RPM for a few seconds pressure drops down to 25 pounds at 900 RPM. If you then make another WOT pass with oil hot at 5300 RPM pressure only builds up to about 30 to 35 pounds at WOT but still holds 25 pounds at 900 RPM. Shut it off for a few mins and when fired back up it's back to 50 pounds at 900 RPM and climbs to 60 to 65 at 3000 RPM but as soon as you do a few WOT passes it's back to 25 pounds at 900 Rpm and will only build to 30 or 40 at WOT. Ran it for about 1/2 hour today and don't feel good about what the gauge is telling me. Has new Autometer electric gauges, Milodone 8 qt pan, running standard wix 51515 filters, running 9plus qts of PENZ 25-50 race oil and a Dyna Gear high volume pump. Oh yes the water temp is cold, only 120 at best all the time with gate valve wide open. I am totally new to all of this, don't want to hut the thing so I'm looking for feedback. The old oil does look have a super super fine goldish sheed mixed in with it, this super super fine trace color has no texture at all and is hard to see unless you shake the container up. Theis sheen seems to come to the top wheh you shake the used oil container up. I'm told what I'm looking at is the zink content in the race oil and normal break in oil discoloration? THANKS!
    Last edited by CVX20; 10-01-2009 at 06:29 PM.
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    You could have a serious case of MILODONITIS!

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    My hemi does the same thing. At start up it wil run between 60-80 psi. Make a few passes and it idles at 27psi and 61psi at 5500rpm. As long as there is oil pressure keep running it tinkering with little things here and there till it stays in a range that your ok. But again you have oil pressure which is a good thing. My total range from idle to wide open is 26-74psi anymore or anyless i know i need to look at it.

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    Classic Hotboater CVX20's Avatar
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    Quote Originally Posted by pump squirt & BAIL! View Post
    You could have a serious case of MILODONITIS!
    Thanks dude, I feel so much better now!
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    Classic Hotboater CVX20's Avatar
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    Quote Originally Posted by 1badavenger View Post
    My hemi does the same thing. At start up it wil run between 60-80 psi. Make a few passes and it idles at 27psi and 61psi at 5500rpm. As long as there is oil pressure keep running it tinkering with little things here and there till it stays in a range that your ok. But again you have oil pressure which is a good thing. My total range from idle to wide open is 26-74psi anymore or anyless i know i need to look at it.
    Thanks for the feedback!
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    Dude It's not AIDS!It's kind of a cross between CRABS and a HEMMEROID! IT"S NOT FATAL!!!

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    Senior Member Ronboats's Avatar
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    The last time I saw a change in the oil pressure and kept running the engine hoping things were ok, I ended up losing a rod bearing and putting trash all through my race motor.It's still sitting in peices on my garage floor needing a new crank, one rod and a complete rebuild on what was a fresh motor. It makes me sick to think about the fact that I watched it destroy itself, because I didnt want to tear it down and check out the bearing clearances. If I had, it would have been a simple overhaul. You should pull it and check the bearings.If they are ok you have not lost anything, but if one is going away, you could lose the whole thing. Just my opinion.

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    All playing aside! Electric gauges are crapola! So first put a real one on! Real one meaning mechanical!!But before you pull the engine first! I mean FIRST! make dam sure you have the right sending unit for your CRAPOLA electric autometer gauge! If you do all this then you still have the same problem. which you most likley wont! But if you do then you have a serious case of MILODONITIS! HOPEFULLY! Also if you have a 8qt pan put 8qts in it for crying out loud! 7 would be better yet. JMO

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    Is it Summer Yet?! SoCalKev's Avatar
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    Going out on a limb here- But take out your oil cooler. SEe what happens. I think your problem is with that.
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    Rollin With Fink fasterthanu's Avatar
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    Quote Originally Posted by pump squirt & BAIL! View Post
    You could have a serious case of MILODONITIS!
    Thats the funniest thing I have heard- I hate their pans. The only good thing is the screw in dipstick...

    It's beacause the designers was thinking with their dipstick and could give a rip about oil control.

    I am not saying thats his problem, just commenting on the Milodonitis.
    Last edited by fasterthanu; 10-02-2009 at 06:43 AM.

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    Quote Originally Posted by fasterthanu View Post
    That the funniest thing I have heard I hate their pans. The only good thing is the screw in dipstick...
    Never had it myself but I hear it's a real BITCH!

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    Quote Originally Posted by CVX20 View Post
    Do I have a problem or what?
    When you fire it up now it's 50 lbs at 900 RPM goes up to 60 or 70 at 3000 RPM. then when you run the boat hard 5300 RPM for a few seconds pressure drops down to 25 pounds at 900 RPM. If you then make another WOT pass with oil hot at 5300 RPM pressure only builds up to about 30 to 35 pounds at WOT but still holds 25 pounds at 900 RPM. Shut it off for a few mins and when fired back up it's back to 50 pounds at 900 RPM and climbs to 60 to 65 at 3000 RPM but as soon as you do a few WOT passes it's back to 25 pounds at 900 Rpm and will only build to 30 or 40 at WOT. THANKS!
    You are beating air into the oil. Not going to say the Milodon pan doesn't suck, because it does. Period. But are you running any type of evac on the oil pan, or just breathers. Evac'ing the pan MIGHT help. Changing the pump pickup WILL help. Milodon has the worse pickups on the market IMO. When you shut it down, the air gets a chance to leave the oil, specially when the oil is hot, and it is easier for the air to escape. Short of good pan with decent windage control, evac'ing is your only option.



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    Senior Member CK7684's Avatar
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    If your pressure isnt returning when the R's drop back down, I'd say your whipping air into the oil and it's foaming.

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    CLASSIC HOTBOATER wideopen's Avatar
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    buy the way his oil cooler and oil filters are plummed with number 6 line way too small should be a number 10 or 12 and the water line to the cooler is also a number 6 need to be larger
    but wont listen will you guys tell him
    and used a used oil pump on a new build with a drag car pan not a boat pan hints no baffels
    Last edited by wideopen; 10-02-2009 at 10:24 AM.

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