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Oil pressure loss

Old 09-13-2020, 03:37 PM
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Default Oil pressure loss

Hey guys!
So hereís the concern- I did my first WOT pull on a new motor yesterday, dropped back down into the no-wake and my oil pressure at in gear idle was hanging around 3-5 pounds.

A little background... thereís about 2 hours on this engine. Itís a 468, 4 bolt, cast crank, flat top pistons, Comp 262/268 112į Flat tappet cam, roller tip rockers, double valve springs on peanut heads.
Iíve got Sierra 25-40 oil in there with 2 bottles of Lucas break in zinc additive. Did the cam break in at 2500 for 25 minutes.
My WOT run was under 7 minutes with 60 PSI at 4600, 155į. I tied up for an hour after, then when I went to trailer up I had 40 pounds at idle headed back to the dock. No hose blow ups in the engine space, cooler, hoses & remote filters are all happy.
Any ideas what happened there?
Thanks for any input!
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Old 09-13-2020, 04:17 PM
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My WOT run was under 7 minutes with 60 PSI at 4600, 155

155 WATER TEMP OR oil TEMP? HUGE DIFERENCE.
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Old 09-13-2020, 04:19 PM
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155 was water temp while under throttle.
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Old 09-13-2020, 04:26 PM
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Verify with mechanical gauge
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Old 09-13-2020, 05:14 PM
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Originally Posted by GLENAMY 242SS View Post
My WOT run was under 7 minutes with 60 PSI at 4600, 155

155 WATER TEMP OR oil TEMP? HUGE DIFERENCE.
What oiling system/oil cooler? Your oil temps were likely thru the roof and thinned oil to a much lighter weight than 40w.
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Old 09-13-2020, 05:25 PM
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Is your oil cooler new or from previous motor?

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Old 09-13-2020, 05:51 PM
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Remove and Cut filter apart before running it again with mechanical gauge , if nothing found in filter.
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Old 09-13-2020, 08:14 PM
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Originally Posted by SB View Post
Remove and Cut filter apart before running it again with mechanical gauge , if nothing found in filter.
Speaking of the filter, what brand and what number did you use?
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Old 09-13-2020, 09:10 PM
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Sounds like your oil cooler is undersized. Some oil filters have a paper medium non friendly for marine use that swells and chokes the system, but my guess is your oil got cooked.
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Old 09-13-2020, 10:07 PM
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Thanks for all the input!
Sounds like a bigger cooler is in order.
Iím just running an OE Merc cooler then taking off with -10 AN hose to a Deralť dual remote filter housing.
Iíve just got some low-end Oíreilly filters on there now but will switch to Wix racing tall filters after I change out the break in oil.
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