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Old 10-07-2020, 06:28 PM   #1
russcc
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Default 59L startup oil pressure at crank speed.

Followed the suggestion of one of the Fordbarner, pouring oil down through output side of the full flow oil system, and removing the plugs. Got oil pressure on cranking right off. Mechanical oil pressure gauge.
This engine is going in the '40 and is 6 volt. Is 20#s oil pressure cranking a 6 volt system satisfactory ?
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Old 10-07-2020, 06:37 PM   #2
Zeke3
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Default Re: 59L startup oil pressure at crank speed.

Cranking speed is probably around 200 rpm at the most. I think 20 psi is a good oil pressure for cranking the engine.
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Old 10-07-2020, 09:39 PM   #3
cadillac512
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Default Re: 59L startup oil pressure at crank speed.

Yes, that's good.
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Old 10-07-2020, 09:48 PM   #4
tubman
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Default Re: 59L startup oil pressure at crank speed.

I would be happy with anything on the gauge at cranking speed.
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Old 10-08-2020, 05:40 AM   #5
russcc
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Default Re: 59L startup oil pressure at crank speed.

Thank you all for sharing your experience.
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Old 10-08-2020, 05:52 AM   #6
Ol' Ron
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Default Re: 59L startup oil pressure at crank speed.

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Sounds alittle high, what grade of oil are you using??
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Old 10-08-2020, 06:09 PM   #7
russcc
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Default Re: 59L startup oil pressure at crank speed.

Good point Ron. Shell Rotella 15W-40. Would a lighter oil be better idea, especially since the weather has turned cooler hear in MA. I do plan to put the engine in a heated area before startup.
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Old 10-08-2020, 10:27 PM   #8
flatjack9
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Default Re: 59L startup oil pressure at crank speed.

I don't see any problem. I generally get more pressure, but I'm cranking with 12 volts.As Tubman says, if you are getting pressure, be happy and run it.
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Old 10-09-2020, 07:49 AM   #9
Ol' Ron
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Default Re: 59L startup oil pressure at crank speed.

I don't see any problem either. However the heaver oil restricts flow, especially with stock bearing clearance. It seems that everybody wants to see hi numbers on the gauge, but flow through the bearing is more important.
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Old 10-09-2020, 05:34 PM   #10
russcc
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Default Re: 59L startup oil pressure at crank speed.

flow through the bearings. Good point Ron. I may swap the 15W-40 for a lower viscosity.
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Old 10-09-2020, 08:21 PM   #11
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Default Re: 59L startup oil pressure at crank speed.

I run 10W- 30 and my engine is 25 years old.
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Old 10-09-2020, 11:19 PM   #12
Ol' Ron
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Default Re: 59L startup oil pressure at crank speed.

Yes, for stock bearings,10/30 in a quality oil does a great job, AS you open your clearances a higher viscosity canbe used, their are sme very good racing oils out there.y
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