454 Oil pressure question
10-10-2008, 02:26 PM
#11
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10-13-2008, 09:03 AM
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ok I see where the plug is on the remote oil filter housing. easy enough. took the boat out today, cold pressure at 3500 rpm 50 psi. then down to 40 when hot, 10-20psi idle hot.
I'm going to just run it until it dies. Then it gives me a good excuse to go 496 or a new 502 block.
I'm going to just run it until it dies. Then it gives me a good excuse to go 496 or a new 502 block.
10-15-2008, 09:22 AM
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I hear ya, but pulling the motor is not a trivial repair. I've done it several times on my Chris Craft, so not afraid of it, but I think I'll try to get another season out of it, and then if i starting hearing noise or the oil pressure drops down further, then I'll pull it.
10-19-2008, 08:25 PM
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ok just put all new gauges in the boat. 30-40 psi idling cold.40-50 at 3500 rpm cold, but after it heats up, 40 is the max pressure, sometimes its 30 at around 3500-4000 rpm. needle fluctuates a little sometimes when idling. might give a new sender a try since it is 19 yrs old.
10-19-2008, 10:25 PM
#17
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I would definately verify the pressure readings with a mech guage before you pull the engine. Also, you need to run the correct that matches the guage you have installed.
10-22-2008, 09:31 PM
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11-03-2008, 01:37 PM
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330 hp 454 is about 40 idling when cold, then runs up to about 50-60 psi on takeoff, then after warms up 30-40 when cruising. when hot idling 10-20. about 100 hrs on engine.
The 454 in my 71 vette is 70-80 psi when cold, 60-70 when driving, 20-30 idling hot. not sure of miles on the engine.
I always heard rule of thumb 10 psi per 1000 rpm. sometimes at 4000rpm on the boat I am around 30 psi when hot.
This is with AMSoil 50 w synthetic. Should I be concerned.
The 454 in my 71 vette is 70-80 psi when cold, 60-70 when driving, 20-30 idling hot. not sure of miles on the engine.
I always heard rule of thumb 10 psi per 1000 rpm. sometimes at 4000rpm on the boat I am around 30 psi when hot.
This is with AMSoil 50 w synthetic. Should I be concerned.
Your motor and most other marine engines have a low pressure / High volume oil pump. Those numbers are perfect. I suggest running a 15W40 delvac or shell rotella.
The vette has a high pressure pump, not the same as what you have in the boat
11-03-2008, 02:16 PM
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The 330 hp in my Baja runs about 55-60 cold, around 50 after warmed up and about 20-25 when I come off plane and idle after running on plane for awhile (usually 3200-3800 rpm), then as the oil cools down while idling it comes back up after about 30-60 seconds. Mark V engine, 25w40 oil.
