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496 mag ho oil pressure

Old 05-29-2021, 09:47 AM
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Default 496 mag ho oil pressure

Hi.
Got a Mercruiser 496 Mag Ho witch I took out for the first time after winter.
I noticed that the oil pressure was varying with the RPM.
I think I had about 35 psi on idling, when cruising on 3000 rpm I think it was about 45 psi and when going back to idle it dropped to about 22-25 psi, and then building up to 35 again.

is this normal? Canít say I noticed this last year.

by the way, I got the pro charger turbo system installed if that matters.
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Old 06-02-2021, 10:18 AM
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That sounds normal. I have a 496HO with a whipple supercharger on it. Keep an eye on your oil temperature. I had to add a gauge to see this. Keep it below about 240 degrees.
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Old 06-02-2021, 10:43 AM
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doesn't that kit use the engine oil to oil the hair dryer or is it self contained
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Old 06-02-2021, 10:44 AM
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Sounds good. Iím steady at 140 on the temp
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Old 06-02-2021, 10:44 AM
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Oil pressure will change with RPM because because oil pump speed changes. Donít know the specs on 496 but 35 at hot idle sounds great. Pressure drop after a run is due to oil getting hot and then comes back up as oil cools at idle. My opinion- note what you have and watch for change over summer, that would indicate a problem.
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Old 06-02-2021, 10:50 AM
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Originally Posted by F-2 Speedy View Post
doesn't that kit use the engine oil to oil the hair dryer or is it self contained
Have no idea 🤷‍♂️
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Old 06-02-2021, 10:51 AM
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Originally Posted by liberator221 View Post
Oil pressure will change with RPM because because oil pump speed changes. Donít know the specs on 496 but 35 at hot idle sounds great. Pressure drop after a run is due to oil getting hot and then comes back up as oil cools at idle. My opinion- note what you have and watch for change over summer, that would indicate a problem.
thanks, will be looking for changes.
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Old 06-02-2021, 11:44 AM
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Originally Posted by Kimwiig View Post
Have no idea 🤷‍♂️
Who ever installed it will know. Also, If you have the part# you an look it up.

You can get Prochargers set up for self oiling or oiled from engine. Most choose self oiling now, but never assume what you have if you arenít sure.
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Old 06-02-2021, 11:59 AM
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Originally Posted by SB View Post
Who ever installed it will know. Also, If you have the part# you an look it up.

You can get Prochargers set up for self oiling or oiled from engine. Most choose self oiling now, but never assume what you have if you arenít sure.
Stupid question, but what difference does it make, Is one better than the other?
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Old 06-02-2021, 12:09 PM
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Originally Posted by Kimwiig View Post
Stupid question, but what difference does it make, Is one better than the other?
if the kit is engine oiled/cooled then that could explain some the flux in pressure you didnt see last yr
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